Computer Club Elmshorn Atari PD/CCE_PD.iso/pc/0600/CCE_0684.ZIP/CCE_0684.PD/DSP_FAQ.TXT

Text File | 1993-05-25 | 109KB | 2,412 lines

Last-modified: Sun Feb 14 1993 Version: 0.9

Welcome to the comp.dsp FAQ.  We are seeking information on all topics, from
the best layout (e.g., should chips and prototype boards be another FAQ?) to a
good annotated list of DSP articles and reference books.  Please email your
suggestions to [e-mail]. Meta-comments are all in curly
braces {like this}.  Acknowledgements to people responsible for articles and/or
bits of information are in square brackets, [like so].

You can ftp the very latest version of this FAQ from: evans.ee.adfa.oz.au
(131.236.30.24) in pub/dsp/dsp-faq.help, or from copernicus.Berkeley.EDU in
dsp-faq.help.*.

We are most grateful to the following contributors who helped out with this
version of the FAQ:

Robert Gammon    [e-mail]
Kevin Gardner    [e-mail]
Witold Waldman    [e-mail]

and the following folks who helped out with previous versions:

William Alves    [e-mail]
Annard Brouwer    [e-mail]
Joe Campbell    [e-mail]
Tim Channon        [e-mail]
Steve Clift        [e-mail]
Joel Coltoff    [e-mail]
Chuck Corley    [e-mail]
Malachy Devlin    [e-mail]
John Edwards      [e-mail]
Brian Evans        [e-mail]
John Fisher        [e-mail]
Dan Frankowski    [e-mail]
Robert Gammon    [e-mail]
Maurice Givens    [e-mail]
Ed Hall        [e-mail]
Vince Herried    [e-mail]
Eric Jacobsen    [e-mail]
Pete Janzow        [e-mail]
Quinn Jensen    [e-mail]
Richard Kim        [e-mail]
Gints Klimanis    [e-mail]
Greg Koker        [e-mail]
Juhana Kouhia    [e-mail]
John Lazzaro    [e-mail]
Sergio Liberman    [e-mail]
Stan McClellan    [e-mail]
Phillip Musumeci    [e-mail]
Bill Ralston    [e-mail]
Tony Richardson    [e-mail]
Paul Russell    [e-mail]
Stanley Sasaki    [e-mail]
Bill Schottstaedt    [e-mail]
Paul Simoneau    [e-mail]
Greg Smart        [e-mail]
Andrew Ukrainec    [e-mail]
Witold Waldman    [e-mail]
Phil Woodland    [e-mail]
Ronnin Yee        [e-mail]

Get your name here - contribute something!  (If you don't want your email
address listed in your contribution, please indicate so.)

Phil Lapsley       [e-mail]  (FAQ maintainer)
Bradley Hards       [e-mail]   (assistant/original FAQ maintainer)

=============================================================================

0. What is comp.dsp?

1. General DSP.
   1.1 DSP book and article references.
       1.1.1 Bibles of DSP.
       1.1.2 Adaptive signal processing.
       1.1.3 Array signal processing.
       1.1.4 Windowing.
       1.1.5 Digital audio effects processing.
   1.2 Where can I get free software for general DSP?
       1.2.1 What is Gabriel?  Where can I get it?
       1.2.2 What is Ptolemy?  Where can I get it?
       1.2.3 What is Khoros?  Where can I get it?
       1.2.4 What are DSP Tutorials?  Where can I get them?
       1.2.5 What are some DSP extensions to MATLAB?  Where can I get them?
       1.2.6 What is the Signal Processing Package for Mathematica?
             Where can I get it?
       1.2.7 What is the Controls System Package for Mathematica?
             Where can I get it?
       1.2.8 What are some other DSP Notebooks for Mathematica?
       1.2.9 What is the Linear Systems Toolbox for Maple?  Where can I get it?
       1.2.10 Where can I get text to speech conversion software?
       1.2.11 Where can I get filter design software?

2. Algorithms and standards.
   2.1 Where can I get some algorithms for DSP?
   2.2 What is CELP and LPC?  Where can I get source for them?
   2.3 What is ADPCM?  Where can I get source for it?
   2.4 What is GSM?  Where can I get source for it?
   2.5 How does pitch perception work, and how do I implement it?
   2.6 What standards exist for digital audio?  What is AES/EBU?
       What is S/PDIF?
   2.7 What is mu-law encoding?  Where can I get source for it?
   2.8 How can I do CD <-> DAT sample rate conversion?

3. Programmable DSP chips and their software.
   3.1 What are some current, popular programmable DSP chips?
   3.2 Software for Motorola DSPs.
    3.2.1 Where can I get a free assembler for the Motorola DSP56000?
    3.2.2 Where can I get a free C compiler for the Motorola DSP56000?
    3.2.3 Where can I get algorithms or libraries for Motorola DSPs?
          What is the number for the Motorola DSP BBS?
    3.2.4 Where can I get NeXT-compatible Motorola DSP56001 code?
   3.3 Software for Texas Instruments DSPs.
    3.3.1 Where can I get algorithms or libraries for TI DSPs?
                 What is the number for the TI DSP BBS?
    3.3.2 Where can I get a free C compiler for the TMS320C30?
   3.4 Software for Analog Devices DSPs.
        3.4.1 Where can I get algorithms or libraries for AD DSPs?
          What is the number for the Analog Devices DSP BBS?

4. Hardware.
    4.1 DSP development boards.
    4.1.1 IBM PC.
    4.1.2 Mac Nubus.
    4.1.3 SBus.
    4.1.4 VMEbus.
    4.1.5 Next bus.
    4.1.6 SCSI bus.
    4.1.7 Standalone.
    4.2 Who makes AES/EBU chips?

5. Operating Systems.

6. List of manufacturers, addresses, and telephone numbers.

To search for a particular question within a text editor, look for the pattern
"Q#.##:", e.g., "Q1.2:".

=============================================================================

Q0: What is comp.dsp?

Comp.dsp is a worldwide UseNet news group that is used to discuss various
aspects of digital signal processing.  It is unmoderated, though we try to keep
the signal to noise ratio up :-).  If you need to ask a question that isn't in
the FAQ, and can't figure out how to post, consult news.newusers.questions.
Other relevant news groups are comp.compression, comp.speech, and
sci.image.processing.

=============================================================================

1. General DSP.

This section deals with general DSP, that is, DSP books, algorithms, and
packages that are not related to a particular manufacturer's DSP chip.

=========================================================================

Q1.1: Summary of DSP books and significant research articles.

Q1.1.1: Bibles of DSP.

A.V. Oppenheim and R.W. Schafer, "Digital Signal Processing", Prentice-Hall,
Inc., Englewood Cliffs, N.J., 1975.

A.V. Oppenheim and R.W. Schafer, "Discrete-Time Signal Processing" Prentice
Hall, Englewood Cliffs, New Jersey 07632, 1989. ISBN 0-13-216292-X This is an
updated version of the original, with some old material deleted and lots of new
material added.

L.R. Rabiner & R.W. Schafer, "Digital Processing of Speech Signals", Prentice
Hall, 1978, ISBN 0-13-213603-1.

R. E. Crochiere & L. R. Rabiner, "Multirate Digital Signal Processing",
Prentice-Hall, 1983, ISBN 0136051626. This book is the only real reference for
filter banks and multirate systems, as opposed to being a tutorial.

Thomas Parsons, "Voice and Speech Processing", McGraw-Hill, 1987, ISBN
0-07-048541-0. Addresses the cocktail party effect, as well as other material.
[Maurice Givens, [e-mail]]

--------------------------------------------------

Q1.1.2: Adaptive signal processing.

S. Haykin, "Adaptive Filter Theory", 2nd Ed., Prentice Hall, Englewood Cliffs,
NJ, 1991.

B. Widrow and S.D. Stearns, "Adaptive Signal Processing", Prentice-Hall, Inc.,
Englewood Cliffs, N.J., 1985.

--------------------------------------------------

Q1.1.3: Array signal processing.

J.E. Hudson, "Adaptive Array Principles", IEE London and New York, Peter
Peregrinus Ltd. Stevenage, U.K., and New York, 1981.

R.A. Monzingo and T.W. Miller, "Introduction to Adaptive Arrays" John Wiley and
Sons, New York, 1980.

S. Haykin, J.H. Justice, N.L. Owsley, J.L. Yen, and A.C. Kak "Array Signal
Processing", Prentice-Hall, Inc., Englewood Cliffs, N.J., 1985.

R.T. Compton, Jr., "Adaptive Antennas, Concepts and Performance",
Prentice-Hall, 1988, ISBN 0-13-004151-3.

--------------------------------------------------

Q1.1.4: Windowing articles.

F. J. Harris, "On the Use of Windows for Harmonic Analysis with the DFT", IEEE
Proceedings, January 1978, pp. 51-83. Perhaps the classic overview paper for
discrete-time windows.  It discusses some 15 different classes of windows
including their spectral responses and the reasons for their development.
[Brian Evans, [e-mail]]

Nezih C. Geckinli & Davras Yavuz, "Some Novel Windows and a Concise Tutorial
Comparison of Window Families", IEEE Transactions on Acoustics, Speech, and
Signal Processing, Vol. ASSP-26, No. 6, December 1978. [Bob Beauchaine,
[e-mail]]

Lineu C. Barbosa, "A Maximum-Energy-Concentration Spectral Window," IBM J. Res.
Develop., Vol. 30, No. 3, May 1986, p. 321-325. An elegant method for designing
a time-discrete solution for realization of a spectral window which is ideal
from an energy concentration viewpoint.  This window is one that concentrates
the maximum amount of energy in a specified bandwidth and hence provides
optimal spectral resolution.  Unlike the Kaiser window, this window is a
discrete-time realization having the same objectives as the continuous-time
prolate spheroidal function; at the expense of not having a closed form
solution. [Joe Campbell, [e-mail]]

--------------------------------------------------

Q1.1.5: Digital Audio Effects Processing.

Books (in no particular order, sorry):

Hal Chamberlin, Musical Applications of Microprocessors, 2nd Ed., Hayden Book
Company, 1985.

Barry Blesser and J. Kates. "Digital Processing in Audio Signals." In A. V.
Oppenheim, ed. Applications of Digital Signal Processing. Englewood Cliffs, NJ:
Prentice-Hall, 1978.

Digital Signal Processing Committee of IEEE Acoustics, Speech, and Signal
Processing Society, ed. Programs for Digital Signal Processing. New York: IEEE
Press, 1979.

John Strawn, ed., "Digital Audio Signal Processing: An Anthology.", Los Altos,
CA: W. Kaufmann, 1985.   [Contains Moorer J.A. "About This Reverb..." and
contains an article which gives a code for Phase Vocoder -- great tool for EQ,
for Pitchshifter and more --Juhana Kouhia]

Charles Dodge and Thomas A. Jerse. Computer Music: Synthesis, Composition, and
Performance. New York: Schirmer Books, 1985.

F. Richard Moore, "Elements of Computer Music", Englewood Cliffs, NJ:
Prentice-Hall, 1990.  ISBN: 0-13252-552-6 [Recommended.  --Juhana Kouhia]

Curtis Roads and John Strawn, ed., "The Foundations of Computer Music",
Cambridge, MA: MIT Press, 1985.  [Contains article on analysis/synthesis by
Strawn, recommended; also an another article maybe by J.A. Moorer -- Juhana
Kouhia]

John Strawn, ed., "Digital Audio Signal Processing", 283 pages, $34.95, ISBN
0-86576-082-9, pub: A-R Editions.  Contents:

    1. Introduction to the mathematics of DSP (F. Richard Moore)
       [Not a bad little text]

    2. Introduction to digital filter theory (Julius O. Smith)
       [Not a bad little text, either]

    3. Spiral Synthesis (Tracy Lind Petersen)
       [first published account of a new synthesis technique]

    4. Signal processing aspects of computer music (J. A. Moorer)
       [James Moorer's classic article--discusses many synthesis
       techniques.  Reverb algorithms.  More than 6 pages of refs]

    5. An introduction to the phase vocoder (J. W. Gordon, J. Strawn)
       [Includes source code for a phase vocoder--a powerful method
       for synthesis, pitch shifting, time scale modification, etc.]
    [Comments by Quinn Jensen].

Curtis Road, ed., "Composers and the Computer", 201 pages, $27.95, ISBN
0-86576-085-3, pub: A-R Editions.

John Strawn, ed., "Digital Audio Engineering", 144 pages, $29.95, ISBN
0-86576-087-X pub: A-R Editions.

Deta S. Davis, "Computer Applications in Music: A Bibliography", 537 pages,
$49.95, ISBN 0-89579-225-7, pub: A-R Editions.

Ken C. Pohlmann, "The Compact Disc:  A Handbook of Theory and Use", 288 pages,
$45.95 (cloth) ISBN 0-89579-234-6, $29.95 (paper) ISBN 0-89579-228-1, pub: A-R
Editions.

Forthcoming books:

Curtis Roads, "A Computer Music History:  Musical Automation from Antiquity to
the Computer Age"

Joseph Rothstein, "MIDI:  A Comprehensive Introduction"

David Cope, "Computer Analysis of Musical Style"

Dexter Morrill and Rick Taube, "A Little Book of Computer Music Instruments"

Articles:

James A. Moorer, "About This Reverberation Business", Computer Music Journal 3,
20 (1979): 13-28. (Also in Foundations of CM below). [Ok article, but you have
to know basic DSP operations.  --Juhana Kouhia]

Check more articles from Journal of the Audio Engineering Society (JAES), for
example more articles by Strawn.

Note: books published by A-R editions can be ordered from:

    A-R Editions
    801 Deming Way
    Madison, Wisconsin 53717
    608-836-9000 (They accept VISA orders)

[The above is largely from Quinn Jensen, [e-mail]; Juhana Kouhia,
[e-mail]; William Alves, [e-mail]; and Paul A Simoneau,
[e-mail]]

=========================================================================

Q1.2: Where can I get free software for general DSP?

The packages listed below are mostly for general purpose DSP, that is, DSP that
is not specific to a particular programmable DSP chip.  See the later sections
in the FAQ for software relevant to a particular programmable DSP chip.

According to Brian Evans: "There was an entire session on this subject [free
DSP software] at ICASSP '92, chaired by Dr. Sally Wood and Dr. James McClellan.
It appears in Volume 4 of the Proceedings, pages 73-112.  There will be another
such session at ICASSP '93." [Brian Evans, [e-mail]]  Much of the
information below is from Brian's mail.

--------------------------------------------------

Q1.2.1: What is Gabriel?  Where can I get it?

Package: Gabriel

Description: Hierarchical block diagram environment for prototyping signal
processing systems on single or multiple processors.  Algorithms expressed in
block diagram form can be simulated, and assembly code can also be generated
for the Motorola DSP56001 and DSP96002.  Gabriel has almost been obsoleted by
Ptolemy, below.

Platforms: sun 3, sun 4, X windows.  Written in Lisp (lisp compiler supplied).

Contact: Alan Kamas, [e-mail].

To obtain: Anonymous ftp to copernicus.berkeley.edu, and retrieve
gabriel-license.shar. This is a shar file of licenses that you must sign and
mail back to us (the old-fashioned way) before we can give you the source.
Then we can tell you the password for an account that will allow you to FTP
Gabriel. --------------------------------------------------

Q1.2.2: What is Ptolemy?  Where can I get it?

Package: Ptolemy

Description: Ptolemy provides a highly flexible foundation for the
specification, simulation, and rapid prototyping of systems.  It is an object
oriented framework within which diverse models of computation can co-exist and
interact.  For example, using Ptolemy a data-flow system can be easily
connected to a hardware simulator which in turn may be connected to a
discrete-event system, etc.  Because of this, Ptolemy can be used to model
entire systems.

In addition, Ptolemy now has code generation capabilities.  From a flow graph
description, Ptolemy can generate both C code and DSP assembly code for rapid
prototyping.  Note that code generation is not yet complete, and is included in
the current release for demonstration purposes only.

Ptolemy has been used for a broad range of applications including signal
processing, telecomunications, parallel processing, wireless communications,
optical phase lock loops, real time systems, and hardware/software co-design.
Ptolemy has also been used as a lab for signal processing and communications
courses.  Currently Ptolemy has hundreds of users in over 75 sites, both in
industry and academia.

Ptolemy is available for the Sun 4 (sparc) and DecStation (MIPS) architectures.
A port to the HP workstation is in progress. Installing the system requires 49
Mbytes for Ptolemy (64 Mbytes after you optionally rebuild) and 16 Mbytes for
the Gnu tools subset.  At least 8 Mbytes of physical memory are required.

Ptolemy has been developed at UC Berkeley over the past 3 years. Further
information, including papers and the complete release notes, is available from
the FTP site.

A license is no longer required to receive Ptolemy.  The source code, binaries,
and documentation are available by anonymous ftp from
    ptolemy.berkeley.edu [ftp "ptolemy.bekeley.edu". login as "anonymous". cd
"pub". get README]

Contact: Alan Kamas, [e-mail].
--------------------------------------------------

Q1.2.3: What is Khoros?  Where can I get it?

Package: Khoros

Description: Block diagram simulator for image and video processing.  1-D
signal processing is also supported.  See the UseNet group
comp.soft-sys.khoros.

Platforms: sun 3, sun 4, others?  X windows.  Written in C.

To obtain: Anonymous ftp to pprg.eece.unm.edu, cd /pub/khoros/release, get
install.ftp. --------------------------------------------------

Q1.2.4: What are DSP Tutorials?  Where can I get them?

Package: DSP Tutorials

Description: Computer aided instruction.

Platforms: suns under SunView.

Contact: Dr. Sally Wood, Electrical Engineering Department, Santa Clara
University, Santa Clara, CA 95053.
--------------------------------------------------

Q1.2.5: What are some DSP extensions to MATLAB?  Where can I get them?

Package: MATLAB user's group public domain extensions to MATLAB

Description:

    The MATLAB Digest is issued at irregular intervals based on the  number
    of  questions  and  software  items  contributed  by  users.   To  make
    submissions  to the digest, please send  to [e-mail] with a
    subject: "DIG" and description.

    For  the  Pacific,   try  [e-mail]  located   at  the
    University of Wollongong, NSW, Australia.

    A plethora of toolboxes are available at FTP site: research.att.com
    (use netlib for the username)

    General index for the MATLAB User Group software library
    ----------------------------------------------------------
    Currently there are the following subdirectories:
    approximation      approximation theory
    archive            old MATLAB user group digests
    control            control theory
    dataanalysis       data analysis and statistics
    graphics           graphics programs
    integration        numerical integration
    linearalgebra      linear algebra utilities
    misc               miscellaneous
    ode                ordinary differential equations
    optimization       as the name says
    pde                partial differential equations
    rootfinding        zero-finding routines
    specialfunctions   special functions
    teaching           for classroom use
    tools              miscellaneous tools

    In order to get an index for a subdirectory (tools, say)
    send the message
        send index from MATLAB/tools
    to [e-mail].

    In order to get some code, (unbundle in the `tools'
    directory, say), send the message
        send unbundle from MATLAB/tools
    to [e-mail].

    FOR  STUDENTS: Prentice Hall has published  a student edition of matlab
    which contains a book and  set of disks for PCs and Macs.  The software
    is limited only in matrix size (32 x 32 matrix;  1024 elements) and  in
    its ability  to import or call  C or Fortran  subroutines.  On the plus
    side, it is able to run without a coprocessor (it will use one if it is
    present) and it includes a subset of the Signal Processing and Controls
    Toolboxes, The Signals and  Systems Toolbox,  which  provides for added
    functionality. Book only (about US$30): ISBN = 0138560064; Book + disk:
    (about US$50 ISBN=0-13-855974-0 for 3.5" or ISBN=0-13-855982-1 for 5.25
    Macintosh version:  ISBN=0-13-855990-2. There will be related books out
    by mid to late 1993 :  Computer Aided Signal Processing with MATLAB, by
    Burrus, Oppenheim, McClellan, Parks, Schafer, and Schussler; and Signal
    Processing : A Computer  Approach, by Etter. More books in this  MATLAB
    Curriculum Series are planned. For general info: [e-mail]

    [From the Matlab Users Group (Editor, [e-mail])]
--------------------------------------------------

Q1.2.6: What are the Signal Processing Packages for Mathematica?
        Where can I get them?

Package: Signal Processing Pacakages (SPP) and Notebooks.

Description:

         Public domain  extensions  to  Mathematica.   Enables the symbolic
    manipulation of signal processing expressions:  1-D discrete/continuous
    convolutions and 1-D/m-D linear transforms  (Laplace, Fourier, z, DTFT,
    and DFT).   For  linear  transforms, you can specify your own transform
    pairs and see the intermediate computations. Great for showing students
    how to take transforms, or for deriving input-output relationships in a
    transform  domain.   Additional abilities include analog filter design,
    solving DE's using transforms, converting signal processing expressions
    to their equivalent TeX forms, and number theoretic operations  (Bezout
    numbers, Smith Form decompositions, and matrix factors).   Accompanying
    SPP  are  tutorial notebooks on analog filter design, Fourier analysis,
    piecewise convolution,  and  the  z-transform (includes a discussion of
    fundamentals  of  digital  filter  design).  These Notebooks illustrate
    difficult concepts (such as  the  flip-and-slide  view  of convolution)
    through animation.  A Notebook reader is available in the public domain
    for Macintosh computers (a BinHexed version is on the ftp site).

    FOR STUDENTS:   A student version of Mathematica is available for $175.
    The price includes a copy of the reference manual.  The only drawbacks
    to the student version are that the floating point coprocessor is dis-
    abled and that upgrades cannot be ordered.

Contact: Brian Evans, [e-mail].

To obtain: anonymous ftp to gauss.eedsp.gatech.edu (130.207.226.24). (available
in UNIX, Mac, and MS-DOS archive formats).

--------------------------------------------------

Q1.2.7: What is the Control Systems Analysis Packages for Mathematica?
        Where can I get them?

Package: Control Systems Analysis Package (COSYPAK) and Notebooks

Description: Public domain extension to Mathematica.  Classical and state-space
control analysis and design methods.  The Notebooks supplement the material in
the textbook "Modern Controls Theory" by Ogata.  Largely based on the Signal
Processing Packages (SPP, see above).

Contact: Dr. Sreenath, [e-mail].

To obtain: anonymous ftp veda.esys.cwru.edu (129.22.40.9).
--------------------------------------------------

Q1.2.8: What are some other Mathematica DSP Notebooks?

The following Mathematica notebooks can be ftped from ccrma-ftp.stanford.edu:

pub/DSP/GenHamming.ma.Z         Generalized Hamming windows pub/DSP/Kaiser.ma.Z
The Kaiser window pub/DSP/WinFlt.ma.Z             Digital filter design by the
"window method"

(There are other DSP related items in pub/DSP on ccrma-ftp; see other sections
of this FAQ for details). --------------------------------------------------

Q1.2.9: What is the Linear Systems Toolbox for Maple?
        Where can I get it?

Package: Linear systems toolbox for Maple.

Description: Public domain extension to Maple.

Contact: Tony Richardson, [e-mail].

To obtain: anonymous ftp to cameron.egr.duke.edu, file
pub/maple/linsys1.2.tar.Z. --------------------------------------------------

Q1.2.10: Where can I get text to speech conversion software?

Free (but not public domain) text to speech conversion software is available
via anonymous ftp from wilma.cs.brown.edu in the pub directory as speak.tar.Z.
It will compile and run on a SPARC's built-in audio after modifying speak.c
with the path of your libaudio.h (e.g., /usr/demo/SOUND/libaudio.h).  It's a
simple phoneme concatenation system with commensurate synthesized speech
quality (a directory of phoneme audio files is included).  [Joe Campbell,
[e-mail]] --------------------------------------------------

Q1.2.11: Where can I get filter design software?

One source is the following: in the August 92 issue of IEEE Transactions on
Signal Processing there is a paper entitled "METEOR: A Constraint-Based FIR
Filter Design Program" by Kenneth Steiglitz, Thomas W. Parks and James F.
Kaiser.  They describe an FIR design program which allows specification of the
target frequency response characteristics in a fairly generalised and flexible
way.  As well as designing filters, the program can optimise filter lengths and
push band limits.

The paper contains a footnote which says "Pascal and C versions of source code
are available to  anonymous ftp at princeton.edu in the directory /pub as
meteor.p, form.p, meteor.c and form.c".

True, they are.  They appear to work.  The Pascal versions have been put
through p2c to get the C versions; all the needed Pascal library stuff is
included in the C versions and they built error-free out of the box for me on
an SGI machine.

One catch is, there is no manual - you need the paper to know how to drive the
programs.

[Steve Clift, [e-mail]]

-----

Another public domain filter design package is DFIR, for FIR filter designs. It
includes design capabilities for: equiripple linear phase multiband filters,
linear phase differentiators, linear phase Hilbert transform filters, MMSE
interpolating filters and equiripple Nyquist filters.  It is written in Fortran
77 and has been tested on DECStations and Suns.

It is available via anonymous ftp from aldebaran.ee.mcgill.ca in "pub/dfir".
Additionally, a package to plot filter responses is available in
"pltfilter-V2R0.tar.Z".

[Peter Kabal, via Witold Waldman]

{ There are other free filter design programs floating around out there,
  such as optfir/wfir.  Does anyone know of ftp sites? }

--------------------------------------------------------------------------
Q1.2.12 Where can I get some DOS stuff?

There is a DOSD library available. The author wrote:

The DSP library is currently on Compuserve engineering forum. It includes a
Microsoft and Turbo C library. At the moment it is just a demo object format
library (and the microsoft version only works with an x87), but the source code
lisence is purchaseable. I have done it this way because at the moment I am
unsure of exactly how I want to make it available, LSI are quite interested in
supplying it with their boards, or I may just offer it a freeware. If you are
interested, I could maybe just send you a disk, the problem is that it is quite
large and costs a bit to download from somewhere like Compuserve.

The library contains many functions for things like FFTs, filtering (including
LMS adaptive), windowing, convolution (inc 2d) and correlation. It also has
loads of examples, of how to use the functions, including things like FIR
filter design methods and amplitude modulation.

{If someone downloads this, mail a note to Brad Hards, [e-mail],
and he will put it up for anonymous FTP. }

=============================================================================

2. Algorithms and standards.

This section deals with DSP algorithms and related standards.

======================================================================= Q2.1:
Where can I get some algorithms for general DSP?

The following archives contain things such as matrix  operations, FFT's and
generally useful things like that, as opposed to complete applications:

(1) host ux1.cso.uiuc.edu - log in as anonymous, get the file math/README.
    It summarises the contents of the archive.

(2) Netlib, which serves some of this software via email. Try mail to
    [e-mail] with "send help" in the subject field.
    For Europe:
        Internet:       [e-mail]
        EARN/BITNET:    [e-mail]
        X.400:          s=netlib; o=nac; c=no;
        EUNET/uucp:     nac!netlib
    For the Pacific, try
        [e-mail]
     For background about netlib, see Jack J. Dongarra and Eric Grosse,
     "Distribution of Mathematical Software Via Electronic Mail,"
     Comm. ACM (1987) 30,403--407.

     A similar collection of statistical software is available from
           [e-mail].

     The symbolic algebra system REDUCE is supported by
          [e-mail].

(3) The Naval Surface Warfare Center has a library of mathematical
    Fortran subroutines that may be of use.  From the report itself:

    NSWC Library of Mathematical Subroutines
    Report No.: NSWC TR 90-21, January 1990
    by Alfred H. Morris, Jr.

    Naval Surface Warfare Center (E43)
    Dahlgren, VA 22448-5000
    U.S.A.

    Distribution: Approved for public release; distribution unlimited.

    Abstract:

    The NSWC library is a library of general-purpose Fortran subroutines
    that provide a basic computational capability in a variety of
    mathematical activities. Emphasis has been placed on the transportability
    of the codes. Subroutines are available in the following areas:
    Elementary Operations, Geometry, Special Functions, Polynomials, Vectors,
    Matrices, Large Dense Systems of Linear Equations, Banded Matrices,
    Sparse Matrices, Eigenvalues and Eigenvectors, l1 Solution of Linear
    Equations, Least-Squares Solution of Linear Equations, Optimization,
    Transforms, Approximation of Functions, Curve Fitting, Surface Fitting,
    Manifold Fitting, Numerical Integration, Integral Equations, Ordinary
    Differential Equations, Partial Differential Equations

    [Witold Waldman, [e-mail]]

    Apparently euler.math.usma.edu has these routines in the file
    "pub/misc/nswc.tar.Z".  This is a 3.2 Mbyte file with 800+ Fortran
    routines mentioned above.  Apparently euler.math.usma.edu has been
    down a lot lately, however, and the network connection to it is
    quite slow.  If somebody would like to make this available from
    a more reliable site, please let us know at [e-mail].

If you don't know where to find what you're after, try archie.

=======================================================================

Q2.2: What are CELP and LPC?  Where can I get the source for CELP and LPC?

CELP stands for "code excited linear prediction".  LPC stands for "linear
predictive coding".  They are compression algorithms used for low bit rate
(2400 and 4800 bps) speech coding.

The U.S. DoD's Federal Standard 1016 (FS 1016) based 4800 bps code excited
linear prediction voice coder version 3.2 (CELP 3.2) Fortran and C simulation
source codes are available for worldwide distribution at no charge (on DOS
diskettes, but configured to compile on Sun SPARC stations) from:

    Bob Fenichel
    National Communications System
    Washington, D.C.  20305
    1-703-692-2124
    1-703-746-4960 (fax)

Example input and processed speech files, a technical information bulletin, and
the official standard "Federal Standard 1016, Telecommunications: Analog to
Digital Conversion of Radio Voice by 4,800 bit/second Code Excited Linear
Prediction (CELP)" are included at no charge.

Unfortunately, a document that is a vital part of the CELP release package is
not available in electronic form.  Anyone serious interested in CELP should
obtain the document:

    Details to Assist in Implementation of Federal Standard 1016 CELP.
    National Communications System, Office of Technology & Standards, 1992.
    Technical Information Bulletin 92-1.

It is available from the above address.

The 4800 bps CELP code is available via anonymous FTP on
furmint.nectar.cs.cmu.edu (128.2.209.1111) in celp.audio.compression. It is
unsupported, and has not been compiled or tested.  This version takes a lot of
CPU time.  It is about 15 times slower than real-time. That is, to code 1
minute of speech takes about 15 minutes.  It has directions on how to reduce
the codebook search to make it faster, but they are only for the speech coding
expert.

The following article describes the FS 1016 4.8-kbps CELP coder:

Campbell, Joseph P. Jr., Thomas E. Tremain and Vanoy C. Welch, "The Proposed
Federal Standard 1016 4800 bps Voice Coder:  CELP," Speech Technology Magazine,
April/May 1990, p. 58-64.

The U.S. DoD's Federal-Standard-1015/NATO-STANAG-4198 based 2400 bps linear
prediction coder version 53 (LPC-10e v53) Fortran or C simulation source codes
are available on a limited basis upon written request to:

    Tom Tremain
    Department of Defense
    Ft. Meade, MD  20755-6000
    USA

The U.S. Federal Standard 1015 (NATO STANAG 4198) is described in: Thomas E.
Tremain, "The Government Standard Linear Predictive Coding Algorithm:  LPC-10,"
Speech Technology Magazine, April 1982, p. 40-49.

Copies of the official standards FS 1015 and FS 1016 are available for US $2.50
each from:

    GSA Rm 6654
    7th & D St SW
    Washington, D.C.  20407
    1 [phone]

Realtime DSP code for FS-1015 and FS-1016 is sold by several vendors,
including:

    John DellaMorte
    DSP Software Engineering
    165 Middlesex Tpk, Suite 206
    Bedford, MA  01730
    1-617-275-3733
    1-617-275-4323 (fax)
    [e-mail]

and

    Analogic Systems
    2916 Ramona
    Palo Alto, CA  94306
    [phone]

DSP Software Engineering's FS-1016 code can run on a DSP Research's Tiger 30 or
on Intellibit's AE2000 TMS320C31 based 3" by 2.5" card.  See section 4.1 for
more on these cards.  Analogic's product runs on a 27 MHz DSP56001 chip.

[Most of the above from Joe Campbell, [e-mail], with
additions from Dan Frankowski, [e-mail], and Ed Hall,
[e-mail]]

======================================================================= Q2.3:
What is ADPCM?  Where can I get source for it?

ADPCM stands for Adaptive Differential Pulse Code Modulation.  It is a family
of speech compression and decompression algorithms.  A common implementation
takes 16-bit linear PCM samples samples and converts them to 4-bit samples,
yeilding a compression rate of 4:1.

There is public domain C code available via anonymous ftp at ftp.cwi.nl in
/pub/adpcm.shar written by Jack Jansen (email [e-mail]).  It is very
programmer-friendly.  The ADPCM code used is the Intel/DVI ADPCM code which is
being recommended by the IMA Digital Audio Technical Working Group.  It allows
the following calls:

adpcm_coder(short inbuf[], char outbuf[], int nsample,
        struct adpcm_state *state); adpcm_decoder(char inbuf[], short outbuf[],
int nsample,
        struct adpcm_state *state);

The routines have been tested on an SGI Indigo running Irix 4.0.2 and on a
Sparcstation 1+ running SunOS 4.1.1.  On a Sun, the code will compress at
250Ksample/sec and decompress at 300Ksample/sec.  On an SGI, the compressor
runs at 350Ksample/sec and the decompressor at 700Ksample/sec.

Note that this is NOT a CCITT G722 coder.   The CCITT ADPCM standard is much
more complicated, probably resulting in better quality sound but also in much
more computational overhead.

[From Dan Frankowski, [e-mail]; Jack Jansen, [e-mail]]

======================================================================= Q2.4:
What is GSM?  Where can I get source for it?

The README file for GSM says:

GSM 06.10 13 kbit/s RPE/LTP speech compression available
--------------------------------------------------------

The Communications and Operating Systems Research Group (KBS) at the Technische
Universitaet Berlin is currently working on a set of UNIX-based tools for
computer-mediated telecooperation that will be made freely available.

As part of this effort we are publishing an implementation of the European GSM
06.10 provisional standard for full-rate speech transcoding, prI-ETS 300 036,
which uses RPE/LTP (residual pulse excitation/long term prediction) coding at
13 kbit/s.

GSM 06.10 compresses frames of 160 13-bit samples (8 kHz sampling rate, i.e. a
frame rate of 50 Hz) into 260 bits; for compatibility with typical UNIX
applications, our implementation turns frames of 160 16-bit linear samples into
33-byte frames (1650 Bytes/s). The quality of the algorithm is good enough for
reliable speaker recognition; even music often survives transcoding in
recognizable form (given the bandwidth limitations of 8 kHz sampling rate).

The interfaces offered are a front end modelled after compress(1), and a
library API.  Compression and decompression run faster than realtime on most
SPARCstations.  The implementation has been verified against the ETSI standard
test patterns.

Jutta Degener ([e-mail]) Carsten Bormann ([e-mail])

Communications and Operating Systems Research Group, TU Berlin Fax:
+49.30.31425156, Phone: [phone]

An implementation can be FTPed from
    tub.cs.tu-berlin.de:/pub/tubmik/gsm-1.0.tar.Z
                           +/pub/tubmik/gsm-1.0-patch1

or as a faster but not always up-to-date alternative:
    liasun3.epfl.ch:/pub/audio/gsm-1.0pl1.tar.Z [From Dan Frankowski,
[e-mail]]
============================================================================
Q2.5: How does pitch perception work, and how do I implement it on my DSP chip?

Pitch is officially defined as "That attribute of auditory sensation in terms
of which sounds may be ordered on a musical scale."  Several good examples
illustrating the subtleties of pitch perception are included in the "Auditory
Demonstrations CD" which is available from the Acoustical Society of America,
Woodbury, NY 10797 for $20.

A good general reference about the psychology of pitch perception is the book:

    B.C.J. Moore, "An Introduction to the Psychology of Hearing",
    Academic Press, London, 1989.

This book is available in paperback and makes a good desk reference.

An algorithm implementation that matches a large body of psychoacoustical work,
but which is computationally very intensive, is presented in the paper:

    Malcolm Slaney and Richard Lyon, "A Perceptual Pitch Detector,"
    Proceedings of the International Conference of Acoustics, Speech,
    and Signal Processing, 1990, Albuquerque, New Mexico.

The definitive papers describing the use of such a perceptual pitch detector as
applied to the classical pitch literature is in:

    Ray Meddis and M. J. Hewitt. "Virtual pitch and phase
        sensitivity of a computer model of the auditory periphery. "
        Journal of the Acoustical Society of America 89 (6 1991): 2866-2682.
        and 2883-2894.

The current work that argues for a pure spectral method starts with the work of
Goldstein:

    J. Goldstein,  "An optimum processor theory for the
    central formation of the pitch of complex tones," Journal
    of the Acoustical Society of America 54, 1496-1516, 1973.

Two approaches are worth considering if something approximating pitch is
appropriate.  The people at IRCAM have proposed a harmonic analysis approach
that can be implemented on a DSP

    Boris Doval and Xavier Rodet, "Estimation of Fundamental Frequency
    of Musical Sound Signals," Proceedings of the 1991 International
    Conference on Acoustics, Speech, and Signal Processing, Toronto,
    Volume 5, pp. 3657-3660.

The classic paper for time domain (peak picking) pitch algorithms is:

    B. Gold and L. Rabiner, "Parallel processing techniques for estimating
    pitch periods of speech in the time domain," Journal of the Acoustical
    Society of America, 46, pp 441-448, 1969.

Finally, a word of caution: Pitch is not single-valued.  We can hear a sound
and match it to several different pitches.  Imagine the number of instruments
in an orchestra, each with its own pitch.  Even a single sound can have more
than one pitch.  See for example Demonstration 27 from the ASA Auditory
Demonstrations CD.

[The above from Malcolm Slaney, Apple Computer, and John Lazzaro, U.C.
Berkeley.]

=======================================================================

Q2.6: What standards are there for digital audio?  What is AES/EBU?
      What is S/P-DIF?

The "AES/EBU" (Audio Engineering Society / European Broadcast Union) digital
audio standard is probably the most popular digital audio standard today.  Most
consumer and professional digital audio devices (CD players, DAT decks, etc.)
that feature digital audio I/O support AES/EBU.

AES/EBU is a bit-serial communications protocol for transmitting digital audio
data through a single transmission line.  It provides two channels of audio
data (up to 24 bits per sample), a method for communication control and status
information ("channel status bits"), and some error detection capabilities.
Clocking information (i.e., sample rate) is derived from the AES/EBU bit
stream, and is thus controlled by the transmitter.  The standard mandates use
of 32 kHz, 44.1 kHz, or 48 kHz sample rates, but some interfaces can be made to
work at other sample rates.

AES/EBU provides both "professional" and "consumer" modes.  The big difference
is in the format of the channel status bits mentioned above. The professional
mode bits include alphanumeric channel origin and destination data, time of day
codes, sample number codes, word length, and other goodies.  The consumer mode
bits have much less information, but do include information on copy protection
(naturally).  Additionally, the standard provides for "user data", which is a
bit stream containing user-defined (i.e., manufacturer-defined) data.
According to Tim Channon, "CD user data is almost raq CD subcode; DAT is
StartID and SkipID.  In progfessional mode, there is an SDLC protocol or, if
DAT, it may be the same as consumer mode."

There physical connection media are commonly used with AES/EBU: balanced
(differential), using two wires and shield in three-wire microphone cable with
XLR connectors; unbalanced (single-ended), using audio coax cable with RCA
jacks; and optical (via fiber optics).

"S/P-DIF" (Sony/Philips Digital Interface Format) typically refers to AES/EBU
operated in consumer mode over unbalanced RCA cable.  Note that S/P-DIF and
AES/EBU mean different things depending on how much of a purist you are in the
digital audio world; see the Finger article below.

References:

Finger, Robert, "AES3-199X: The Revised Two Channel Digital Audio Interface
(DRAFT)", presented at the 91st Convention of the Audio Engineering Society,
October 4-8, 1991.  Reprints: AES, 60 East 42nd St., New York, NY, 10165.

[The above from Phil Lapsley, [e-mail], and Tim Channon,
[e-mail]]

=============================================================================

Q2.7: What is mu-law encoding?  Where can I get source for it?

Mu-law (also "u-law") encoding is a form of logarithmic quantization or
companding.  It's based on the observation that many signals are statistically
more likely to be near a low signal level than a high signal level.  Therefore,
it makes more sense to have more quantization points near a low level than a
high level.  In a typical mu-law system, linear samples of 14 to 16 bits are
companded to 8 bits.  Most telephone quality codecs (including the
Sparcstation's audio codec) use mu-law encoded samples.

Desktop Sparc machines come with routines to convert between linear and mu-law
samples.  On a desktop Sparc, see the man page for audio_ulaw2linear in
/usr/demo/SOUND/man.

Craig Reese posted the source of similar routines to comp.dsp in August '92.
These are archived on evans.ee.adfa.oz.au (131.236.30.24) in /pub/dsp/misc

References:

CCITT Recommendation G.711 (very difficult to follow).

Michael Villeret, et. al, "A New Digital Technique for Implementation of Any
Continuous PCM Companding Law,", IEEE Int. Conf. on Communications, 1973, vol.
1, pp. 11.12-11.17.

MIL-STD-188-113, "Interoperability and Performance Standards for
Analog-to-Digital Conversion Techniques," 17 February 1987.

"TI Digital Signal Processing Applications with the TMS320 Family", pp.
169-198.

[From Joe Campbell; Craig Reese, [e-mail]; Sepehr Mehrabanzad,
[e-mail]]

=============================================================================

Q2.8: How can I do CD <-> DAT sample rate conversion?

CD players use a 44.1 kHz sample rate, whereas DAT uses a 48 kHz sample rate.
This means that you must do sample rate conversion before you can get data from
a CD player directly into a DAT deck.

[From Ed Hall, [e-mail]:]

For a start, look at "Multirate Digital Signal Processing" by Crochiere and
Rabiner (see FAQ section 1.1).

Almost any technique for producing good digital low-pass filters will be
adaptable to sample-rate conversion. 44.1:48 and vice-versa is pretty hairy,
though, because the lowest whole-number ratio is 147:160.  To do all that in
one go would require a FIR with thousands of coefficients, of which only
1/147th or 1/160th are used for each sample--the real problem is memory, not
CPU for most DSP chips.  You could chain several interpolators and decimators,
as suggested by factoring the ratio into 3*7*7:2*2*2*2*2*5.  This adds
complexity, but reduces the number of coefficients required by a considerable
amount.

In any case, your local DSP guru will probably be able to suggest a good
program for designing digital filters (this is a good general question for the
net, anyway).  This is one case where going beyond the simpler
windowed-sinc-based approaches might pay off (and I'm afraid I can't recommend
any readily available programs myself).

=============================================================================

3. Programmable DSP chips and software.

This section deals with programmable DSP chips and their software.

Q3.1: What are the available DSP chips and chip architectures?

{ This is based on a woefully inadequate databook collection.  Anyone want
  to add to this list?  Manufacturers want to submit anything? }

The "big four" programmable DSP chip manufacturers are Texas Instruments, with
the TMS320 series of chips; Motorola, with the DSP56000 and DSP96000 series;
AT&T, with the DSP16 and DSP32 series; and Analog Devices, with the ADSP2100
series.  A good overview of prorammable DSP chips is published periodically in
EDN magazine.  The most recent version is from Sep. 17, 1992, pp. 90-141.

Here's a less ambitious chip breakdown by manufacturer:

-------------------------------------

Texas Instuments:

TMS320C1x: family of low cost fixed-point DSP's; 16 bit data, 32 bit registers;
Various RAM and ROM configurations; 16 bit I/O bus, serial ports.

TMS320C25: 50MHz fixed-point DSP; 16 bit data, 32 bit registers; 12.5 MIPS @
50MHz.

TMS320C30: 27/33/40 MHz floating point DSP; 32 bit floating point, 24 bit fixed
point data, 40 bit  registers; DMA  controller; dual serial ports; some support
for multi-processor arrays.

TMS320C31: version of C30 minus peripheral bus, one serial port, and the 4Kx32
internal ROM.  ~$20, 132 pin PQFP.

TMS320C40: 40/50 MHz floating point DSP; extensive parallel processing support
through 6 buffered byte-wide 20 Mb/s links and 6 channel DMA; cache.

TMS320C50: enhanced TMS320C25 (double throughput); low overhead looping; 10
Kwords SRAM on chip.

-------------------------------------

Motorola:

DSP56001: 20.5, 27, or 33 MHz 24-bit fixed point DSP.  24 bit data bus, 16 bit
address bus, 56 bit accumulators (2), host interface port, serial ports (2),
general purpose I/O pins, timer.  Harvard architecture.  512 words program RAM,
32 words bootstrap ROM, 512 words data RAM, 512 words data ROM on chip.
Available in PGA, CQFP or PQFP packaging.

DSP56000: Mask-programmed version of DSP56001, same peripherals and data
memories, 3.75k words program ROM on chip.

DSP56002: modular DSP based on new 24-bit DSP56k core, a superset of the
DSP56001 architecture with On-Chip Emulation (OnCE) debug port, clock PLL and
improved bus arbitration. Has four cycle double precision multiply and support
for block floating point. Same memory as in DSP56001, except for 64 words
bootstrap ROM.  Host interface port, serial ports (2), general purpose I/O
pins, programmable 24-bit timer, non-maskable interrupt.  Low power fully
static design, no minimum clock frequency requirement.  Available at 40 MHz (5V
supply) in PGA and CQFP packaging.

DSP56004: modular DSP, same 24-bit DSP56k core as in DSP56002. Targeted to
consumer digital audio applications.  Has On-Chip Emulation (OnCE) debug port,
clock PLL, serial host interface (I2C and SPI), four general purpose I/O pins,
two stereo serial audio receivers (I2S/Sony), three stereo serial audio
transmitters (I2S/Sony), external SRAM/DRAM memory interface with 8-bit data
bus.  Low power fully static design, no minimum clock frequency requirement.
Available at 40 MHz (5V supply) in 80-pin QFP package.

DSP56156: 40, 50, or 60 MHz fixed point DSP; 16 bit data bus, 40 bit
accumulators (2), host interface port, serial ports (2), timer, OnCE debug
port, clock PLL, 14 bit sigma-delta voice band CODEC, 2K words program RAM, 2K
words data RAM on chip.

DSP96002: IEEE format floating point DSP; two complete 32 bit data and address
buses; Harvard architecture. 1k words program RAM, 64 words bootstrap ROM, 1k
words data RAM, 1k words data ROM, host interface ports (2).  Available in 33
MHz or 40 MHz in 223-pin PGA packaging. [The above from   Sergio Liberman,
[e-mail]    ]

-------------------------------------

AT&T:

DSP32C: floating point DSP; 32 bit floating point, 16/24 bit fixed point data.

DSP3210: floating point DSP; 32 bit floating point, 16/32 bit fixed point data;
32 bit address and data bus, serial port.

[and others; we don't have a good list, unfortunately].

-------------------------------------

Analog Devices:

ADSP2100: 32 and 50Mhz fixed point DSP (8 MIPS, 12.5MIPS).  16 bit registers
except for multiplyer-accumulate register which is 40 bits.  No on chip memory
except for a 16 word instruction cache.

ADSP2101: Derived from ADSP2100, 16 bit registers except for the multiplier
accumulator which is 40 bits. 2Kx24 instruction/data ram in program memory
space, 1Kx16 data ram in data memory space.  Adds memory, timer, serial ports,
etc. to the 2100.  Fastest speed grade in production is 16.6 MHz (16.6MIPS).

ADSP2102: Ram/rom version of 2101; user selects how much of the 2kx24 program
memory is mask rom.

ADSP2103: 3V version of the 2101.

ADSP2105: 10Mhz fixed point DSP with 1 serial port, timer and 1kx24
instruction/data ram in program memory space, and 512 word data ram in data
memory space. This processor sells for US $9.90 in any quantity.

ADSP2111: adds a 8/16bit host interface port to 2101.

ADSP21msp50: ADSP2111 with an on chip a/d and d/a interface and additional low
power modes.

ADSP2161: has 8Kx24 mask rom.

DSP21020: 20/25/33 MHz floating-point DSP;  Supports 32-bit fixed point, IEEE
format 32-bit floating point, and 40-bit floating point;  40-bit registers plus
two 80-bit fixed-point multiply-accumulators;  Harvard arch. with 32 word
instruction cache allows two data accesses in a single cycle;  IEEE 1149.1 JTAG
boundry scan; 33.3 MIPS @ 33.3 MHz.

ADSP21010: Slower and cheaper version of '020 (16 MHz).  Limited to 32-bit
fixed and floating point.

All of the processors (except the 2100) use a 1X instruction clock and use an
on chip PLL to generate an internal 4X clock.  All processors have an extended
Harvard architecture which allows two data fetches and an instruction fetch
every cycle in parallel with an alu or mac operation.  All instructions
including accessing external memory can complete in 1 cycle.

[Analog Devices DSP applications, [e-mail]]

=======================================================================

Q3.2: Software for Motorola DSPs.

=======================================================================

Q3.2.1: Where can I get a free assembler for the Motorola DSP56000?

A free assembler for the Motorola DSP56000 exists, thanks to Quinn Jensen,
[e-mail].  The current version is 1.1, and it is posted to
alt.sources, so look for it on mirrors of that newsgroup (like
wuarchive.wustl.edu).

=======================================================================

Q3.2.2: Where can I get a free C compiler for the Motorola DSP56000?

There are two separate compiler sources for the Motorola DSP56000.  One is the
port of gcc 1.40 done by Andrew Sterian ([e-mail]) and the other
is a port of gcc 1.37.1 done by Motorola and returned to the FSF.  Andrew's
port has bowed to Motorola's version.  Both may be portable to gcc2.x.x with
some effort required.  Neither of these comes with an assembler, but you can
get a free DSP56000 assembler elsewhere (see Q3.2.1 above).

The Motorola gcc source is available for FTP from:

    nic.funet.fi        ~pub/ham/dsp/dsp56k-tools/dsp56k-gcc.tar.Z
    evans.ee.adfa.oz.au    pub/micros/56k/g56k.tar.Z

From Andrew Sterian, [e-mail]:

My DSP56156 port is still the only DSP56156 compiler around and I have just
released an updated version of it.  Both this compiler and the previous
incarnation are archived on wuarchive.wustl.edu (in the usenet/alt.sources
directory) amongst other places.

=======================================================================

Q3.2.3: Where can I get algorithms and libraries for Motorola DSPs?
    What is the number for the Motorola DSP BBS?

Motorola runs "Dr. Bub", a bulletin board for DSPs containing source code for
various libraries and algorithms.  You can call it at [phone] (9600,
4800, 2400, 1200 bps) or [phone] (2400/1200/300 bps). Format is 8 data
bits, no parity, 1 stop bit).  Log in as "guest" to browse the system, or you
can open an account by entering "new" at the account name prompt.  [John
Fisher, [e-mail]]

Alternatively, Dr. BuB is mirrored on the following sites:

calvin.stanford.edu   (36.14.0.43)     in   /motorola bode.ee.ualberta.ca
(129.128.16.96)  in   /pub/dos/motorola nic.funet.fi          (128.214.6.100)
in   /pub/misc/motorola doc.ic.ac.uk          (146.169.3.7)    in
/computing/systems/motorola/digital-signal-processing/dr.bub.sources

Also try nic.funet.fi in /pub/ham/dsp for a lot of good stuff on communications
uses, including some hardware.

ccrma-ftp.stanford.edu also has a variety of DSP code (much of it NeXT
specific, see below), including the following for the DSP56000:

pub/clm.tar.Z        "CLM", a package aimed mainly at composers doing
            computer music in Common Lisp, but includes a Lisp
            56000 assembler, debugger, loader, large libraries of
            DSP56000 routines useful in computer music, and
            a compiler from a subset of Common Lisp to
            DSP56000 code.  [[e-mail]]

=======================================================================

Q3.2.4: Where can I get NeXT-compatible Motorola DSP56001 code?

Try the following from ccrma-ftp.Stanford.EDU:

DSP programs for the NeXT platform:

pub/DSP/resample.tar.Z          Audio sampling-rate conversion and FIR
                filter design. pub/DSP/ResoLab2.1.tar.Z
Interactive filter instrument; sources now
                included, online help. pub/DSP/Spectro.Z
Spectrum analysis tool, with source code. pub/DSP/WaveFormEditor.tar.Z    Jean
Laroche's real-time waveform editor,
                with DAJ's additions.

DSP programming examples for the NeXT platform:

pub/DSP/dsp_dma_stream.tar.Z    Fast DSP DMA programming example (two-way DMA).
pub/DSP/JeanLaroche.tar.Z       Low-level sound and DSP programming examples
                and docs.

[[e-mail]]

=======================================================================

Q3.3: Software for Texas Instruments DSPs.

=======================================================================

Q3.3.1: Where can I get algorithms or libraries for TI DSPs?
        What is the number for the TI DSP BBS?

nic.funet.fi has some old, apparently public domain, assembler and related
tools from TI for the TMS320 family.  [Antti-Pekka Virtanen, [e-mail]]

The TI DSP bulletin board is at [phone] (300, 1200, 2400, or 9600 bps; 8
data, 1 stop, no parity).

evans.ee.adfa.oz.au has a mirror of the TI DSP bulletin board in
"mirrors/tibbs".  See the "00README" file at the top of the directory tree for
info.  Please restrict FTP session to outside of 8 am to 6 pm local time (10 pm
to 8 am GMT). This is mirrored from ti.com, in /tms320bbs. The TI site is the
official one, but has no user contributed software. [Brad Hards,
[e-mail]]

{ If anyone knows of any other sources for TI DSP software, please let us know
at [e-mail].  Thanks! }

=======================================================================

Q3.3.2: Where can I get a free C compiler for the TI TMS320C30?

Sonitech (see vendors list) has a gcc based TMS320C30 C compiler that was
originally done Computer Motion.  Sonitech sells it for $995, but under the
terms of the Gnu Public License, other people can then give it away.  While we
haven't heard of any ftp sites yet, there are bound to be some soon.

=======================================================================

Q3.4: Software for Analog Devices DSPs.

=======================================================================

Q3.4.1: Where can I get algorithms or libraries for Analog Devices DSPs?
        What is the number for the Analog Devices DSP BBS?

The number for the Analog Devices DSP BBS is [phone] (300, 1200, 2400,
9600, 14400 bps), 8N1.

[Analog Devices DSP Applications, [e-mail]]

{ If anyone knows of other sources for Analog Devices DSP software, please let
us know at [e-mail].  Thanks! }

=======================================================================

4. Hardware.

This section deals with DSP hardware, including boards, peripherals, and some
peripheral chips.

Q4.1: DSP development boards.

Note: This information was mainly supplied by vendor catalogues.  It is in no
way definitive, and much of the information may well be out of date or simply
wrong.  Beware!

Q4.1.1: IBM PC DSP development boards.

IBM PC boards, Analog Devices 2100 series processors:
----------------------------------------------------------------------------
Name: ADSP-2101 DSPB 2101-4 Type: Four processor ADSP-2101 IBM PC AT board
Company: CMS GmbH Processor: 4x ADSP 2101 Analog I/O: 2 16 bit A/Ds per
processor.

Name: ADSP-2101 LAB-DSP Type: ADSP-2101 or ADSP-2105 IBM PC/AT XT Company:
Computer Continuum Processor: ADSP 2101 or ADSP 2105 Features: Shared memory
between PC and DSP.  Serial I/O.  Daughter board.

Name: Feature Finder ADSP-2105 Type: ADSP-2105 frame grabber for IBM PC
Company: Current Technology, Inc. Processor: ADSP 2101 Features: RS-170 video
interface, 512x512 video memory, feature extraction s/w

Name: LAB2105 DSP Card Type: ADSP-2105 board for IBM PC Company: EnterTec, Inc.
Processor: ADSP-2105 Analog I/O: Codec with microphone input and headphone
output.

Name: ADSP-2105 DSP Platform Type: Dual ADSP-2105 or ADSP-2101 IBM PC board
Company: Hollis Electronics Processor: 2x ADSP-2105 (or ADSP-2101s) Analog I/O:
2 14 bit D/A, 2 12 bit A/D Features: 2x RS-232 UARTs, real-time clock, 2x 16
bit timers, 4 char LED

Name: ADSP-2100 DX2100 Type: ADSP 2100 (?) IBM PC board Company: Logabex
Processor: ADSP-2100 (?)

Name: ADSP-2100 System board Type:  ADSP-2100A IBM PC card Company:
Loughborough Sound Images Processor: ADSP-2100A 40 MHz 16K words RAM Analog
I/O: 12 bit 125 kHz A/D, D/A

Name: ADSP-2101 System board Type: ADSP-2101 IBM PC card Company: Loughborough
Sound Images Processor: ADSP-2101 12.5 MHz, 8K words RAM Analog I/O: A/D --
D/A: dual 14 bit 19.2 kHz CODECs (TI TLC32044Cs) Comments: 32Kx8 EPROM socket
allows some standalone behavior

Name: GODSPEED (ADSP-2101) Type: ADSP-2101 IBM PC board Company: Prime Ideal
Processor: ADSP-2101, dual-port RAM to PC bus Analog I/O: 48 kHz codec w/
speaker and mic connectors

Name: ADSP-2105 Espresso Board Type: ADSP-2105 IBM PC XT/AT board Company:
Saddle Point Systems Processor: ADSP-2105 or ADSP-2101, 28K words memory.
Analog I/O: on board codec

Name: ADSP-2101 SPB2 Type: Dual ADSP-2101 IBM PC AT board Company: Signal-Data
Processor: 2x ADSP-2101s, 32Kw RAM/proc, 8Kw ROM/proc. Analog I/O: 12 bit A/D,
12 bit D/A on one processor

Name: PC-1601A, DSPS-2601 Type: ADSP-2101 IBM PC board (?) Company: Wavetron
Microsystems Comments: DSPS-2601 is a multi-channel version. (?)

IBM PC boards, Analog Devices 21000 series processors:
----------------------------------------------------------------------------
Name: GAMMA 20/25 Type: ADSP-21020 IBM PC AT board Company: BittWare Research
Systems, Inc. Processor: DSP-21020 25 MHz, 32K or 128K RAM Analog I/O: daughter
card available Features: DT-connect interface, mezzanine bus for daughter cards

Name: ADSP-21020 System Board Type: ADSP-21020 IBM PC AT board Company:
Loughborough Sound Images Processor: ADSP-21020, 160 Kw program RAM, 160 Kw
data RAM Analog I/O: dual 16 bit analog I/O daughter card option. Features:
Interval timer.

IBM PC boards, AT&T processors:
----------------------------------------------------------------------------
Name: DSP-32C Type: AT&T DSP-32C IBM PC-AT card Company: Ariel Corp (908)
249-2900 Processor: DSP-32C

Name: V3-B0-00 Type: AT&T DSP-32C IBM PC-AT (16 bit) card Company:
Communication Automation and Control, Inc. [phone] Processor: DSP-32C 50
MHz, 128 K? SRAM (expandable) Analog I/O: available via mezzanine card
Features: mezzanine bus Price: $1245

Name: AC5-A0 Type: AT&T DSP-32C IBM PC-AT (16 bit) card Company: Communication
Automation and Control, Inc. [phone] Processor: DSP-32C 50 MHz, 64 K?
SRAM (expandable) Analog I/O: available via mezzanine card Features: mezzanine
bus Price: $995

Name: XC5-A0 Type: AT&T DSP-32C IBM PC-AT (8 bit) card Company: Communication
Automation and Control, Inc. [phone] Processor: DSP-32C 49.152 MHz, 64
K? SRAM (expandable) Analog I/O: available via mezzanine card Features:
mezzanine bus Price: $995

Name: DSP32C System board Type: DSP32C IBM PC AT card Company: Loughborough
Sound Images Processor: DSP32C 50 MHz, 40K words RAM Analog I/O: dual 16 bit
153 kHz A/D, D/A (Burr Brown PCM78 & PCM56) Comments: "DSP32 Processor board"
is as above, but without analog I/O. Instead it has a wire wrap prototyping
area.

Name: DSP32C Telephony Board Type: DSP32C IBM PC AT card Company: Loughborough
Sound Images Processor: DSP32C 50 MHz, 40K words RAM Analog I/O: AT&T 7525
CODEC Features: 4 line telephone interface with opto-isolated ring detector in
either US or UK configuration.

Name: AT-DSP2200 Type: AT&T DSP-32C IBM PC-AT card Company: National
Instruments [phone] Processor: DSP-32C Analog I/O: 16 bit sigma-delta
A/D, D/A Features: 16 bit real-time system integration (RTSI) peripheral bus
interface.

Name: Array Processor Card AP2 Type: AT&T DSP-32C IBM PC-AT card Company:
Tucker-Davis Technologies Processor: DSP-32C 50 MHz, 512 Kbytes SRAM, 8.5
Mbytes DRAM Analog I/O: available via expansion card Features: fiber optic
interface to a variety of peripherals Comments: available with the "AP2
operating system" (APOS), which is also a sort of high-level language for
rapidly building DSP applications.

Name: Qw3210-SA Type: DSP3210 IBM PC (ISA) card Company: Quantawave, (508)
481-9802 Processor: DSP3210 64 MHz, 136 kbytes SRAM, dual-port DRAM between PC,
DSP Analog I/O: dual 16 bit 200 kHz A/D, D/A with programmable gain, cutoff
Price: $2995

Name: MP3210 Type: DSP3210 IBM PC card Company: Ariel, [phone]
Processor: 1 or 2 DSP3210 55 MHz, 64 kbytes SRAM (1 ws), 1 Mbyte DRAM (4-6 ws)
Analog I/O: dual 16 bit 100 kHz A/D, D/A (400 kHz -> 12 bit) Features:
DT-connect interface, NABus interface

IBM PC boards, Motorola DSP56000 processors:
----------------------------------------------------------------------------
Name: DSP-56 Type: DSP56001 IBM PC AT card Company: Ariel Corp [phone]
Processor: 27 (?) MHz DSP56001 Analog I/O: dual 16 bit 100 kHz A/D, D/A
Features: DSPnet parallel interface, SCSI interface, async serial interface

Name: PC-56 Type: DSP56001 IBM PC AT card Company: Ariel Corp [phone]
Processor: 27 MHz 56k with 16K or 64K words RAM Analog I/O: optional 14 bit
single channel analog I/O.

Name: Cheetah mother board Type: DSP96002/dual DSP56001 IBM PC AT card Company:
Atlanta Signal Processors, Inc. (ASPI) [phone] Processor: DSP96002 33
MHz, 256k-2M bytes RAM, dual DSP56001s 20 MHz Features: serial interfaces.

Name: DSP56001 System board Type: DSP56001 IBM PC card Company: Loughborough
Sound Images Processor: DSP56001 20Mhz 192K words RAM Analog I/O: two 16 bit
153 kHz A/D w/ 3rd order analog filters,
       two 16 bit D/A  w/ 3rd order analog filters, telephony codec Comments:
"DSP56001 Processor board" is same, but without analog I/O

Name: Dual DSP56001 Processor board Type: two processor DSP56001 IBM PC card
Company: Loughborough Sound Images Processor: 27 MHz 56k, 32K words RAM per CPU
           Interface: Two ADS ports, each processor has RS422 or SLD ISDN
Comments: 2Kx16 bit dual port RAM between host and each processor,
           2Kx24 bit dual port RAM between 56ks

Name: DSP56001 Application Development System (ADS) Type: DSP56001 board for
IBM PC Company: Motorola Corp. [phone] Processor: DSP56001 Comments:
Motorola produce DSP56000 assembler, linker, simulator, C compiler. This is an
external board that interfaces to a variety of hosts, including the IBM PC, via
host-specific adaptor cards.

IBM PC boards, Motorola DSP56156/DSP56116 processors:
----------------------------------------------------------------------------
Name: DSPB56166 System board Type: DSP56156 IBM PC AT card Company: Integrated
Technologies Solutions, Inc. Processor: DSP56156 ?? MHz, ?? words RAM,
Features: Xilinx FPGA for custom digital I/O

Name: DSP56116 System board Type: DSP56116 IBM PC AT card Company: Spectrum
Signal Processing [phone] Processor: DSP56116 80? MHz, 30K words RAM,
Analog I/O: two CODECs attached to 56116 serial ports

IBM PC boards, Motorola DSP96000 processor:
----------------------------------------------------------------------------
Name: MM-96 Type: Two processor DSP96002 IBM PC AT card Company: Ariel Corp
[phone] Processor: 2x DSP96002

Name: DSP96002 System board Type: DSP96002 IBM PC card Company: Loughborough
Sound Images Processor: DSP96002 33 MHz , 64Kword 0ws RAM + 256Kword 1ws RAM
Analog I/O: dual 16 bit 100 kHz A/D converters (Motorola 56ADC16s)

Name: DSP96002 Application Development System (ADS) Type: DSP96002 board for
IBM PC Company: Motorola Corp. [phone] Processor: DSP96002 Comments:
This is an external board that interfaces to a variety of hosts, including the
IBM PC, via host-specific adaptor cards.

IBM PC boards, Texas Instruments TMS320C1x processors:
----------------------------------------------------------------------------
Name: TMS320C1x Development System Type: IBM PC card Company: Loughborough
Sound Images Processor: TMS320C14 Comments: Integrated emulation and
programming system.

Type: PC board with TMS32010 Company: Natural Microsystems Corp. [phone]
Processor: TMS32010

IBM PC boards, Texas Instruments TMS320C25 processors:
----------------------------------------------------------------------------
Name: DSP-16+ Type: TMS320C25 IBM PC AT card Company: Ariel Corp [phone]
Processor: 40 MHz 320C25 Analog I/O: two channel 16 bit 50 kHz A/D, D/A.

Name: Chimera system Type: TMS320C25 or TMS320C26 IBM PC AT card Company:
Atlanta Signal Processors, Inc. (ASPI) [phone] Processor:
TMS320C25/TMS320C26, 40/50 MHz, 4K-64K words RAM Analog I/O: optional 16 bit
200 kHz A/D, D/A is optional via daughter card.

Name: BN2500 DSP development and acquisition processor Company: Bridgenorth
Signal Processing, [phone] Type: TMS320C25 IBM PC card Processor:
TMS320C25 40 (opt 50) MHz, 32 Kw 0 ws SRAM, 32Kw 1 ws SRAM, 64 Kw 1 ws SRAM,
256 Kw 1 ws DRAM Analog I/O: dual 16 bit A/D, D/A via BN3216 expansion module
Features: external buffer management unit to expand address range of C25

Name: Model 250 DSP board Type: TMS320C25 board for IBM PC AT Company: Dalanco
Spry Processor: TMS320C25 40 MHz, 4K words program RAM (64K optional),
    32K words data RAM (128K optional) (1 ws), Analog I/O: 12 bit 300 kHz
A/D, dual 12 bit 250 kHz D/A Features: 16 bit expansion bus, serial port

Name: TMS320C25 System board Type: TMS320C25 IBM PC card Company: Loughborough
Sound Images Processor: TMS320C25 40 or 50 MHz 16K words RAM Analog I/O: 1
channel 16 bit 54 kHZ A/D, D/A (100 kHz 12 bit) Comments: "TMS320C25 Processor
board" is as above, but without analog I/O

Name: TMS320C25 Data Acquisition Processor Type: TMS320C25 IBM PC card Company:
Loughborough Sound Images Processor: TMS320C25 40 MHz, 64K words program RAM,
64K words data RAM,
    256K words buffer RAM Features: Has buffer management unit, handling
circular buffer management, multiple data channel support, data compare
functions, sample counter.

IBM PC boards, Texas Instruments TMS320C30 processors:
----------------------------------------------------------------------------
Name: Banshee mother board Type: TMS320C30 IBM PC AT card Company: Atlanta
Signal Processors, Inc. (ASPI) [phone] Processor: TMS320C30 33 MHz,
256k-512k bytes RAM Analog I/O: 16 bit 200 kHZ A/D, D/A available via optional
boards. Comments: Optional boards allow multiple Banshee boards to be
connected, provide extra memory, and provide analog I/O.

Name: BN3000 DSP development and acquisition processor Company: Bridgenorth
Signal Processing, [phone] Type: TMS320C30 IBM PC card Processor:
TMS320C30 ?? MHz (60 ns cycle), 512 Kw SRAM (1 ws) Analog I/O: dual 16 bit A/D,
D/A via BN3216 expansion module Features: serial, parallel interfaces

Name: Tiger 30 Type: TMS320C30 board for IBM PC Company: DSP Research
Processor: TMS320C30

Name: TMS320C30 System board Type: TMS320C30 IBM PC AT card Company:
Loughborough Sound Images Processor: TMS320C30 33 MHz, 64K words RAM Analog
I/O: 2x 16 bit A/D (Burr Brown PCM78), 2x 16 bit D/A (Burr Brown PCM56)
Comments: "TMS320C30 Processor board" is as above, but without analog I/O and
has instead a prototyping area.

Name: SPIRIT-30 AT/ISA Company: Sonitech International Type: TMS320C30 IBM PC
card Processor: TMS320C30 33 MHz, 256 Kbytes SRAM (expandable) Analog I/O:
available via serial port interfaces Features: serial, parallel ports

Name: EVM30 Company: Texas Instruments Type: TMS320C30 IBM PC card (?)
Processor: TMS320C30 30 MHz, 16 Kw RAM Analog I/O: 14 bit codec, up to 19.2 kHz
sample rate Comments: inexpensive TI development platform for the C30

IBM PC boards, Texas Instruments TMS320C40 processors:
----------------------------------------------------------------------------
Name: Vortex system board Type: TMS320C40/TMS320C31 IBM PC AT card Company:
Atlanta Signal Processors, Inc. (ASPI) [phone] Processor: TMS320C40 ??
MHz, TMS320C31 33 MHz, 128 kbytes SRAM Analog I/O: optional 16 bit 200 kHz A/D,
D/A via daughter card.

Name: HEPC2-U Type: TMS320C40 IBM PC AT card Company: Traquair Data Systems
Processor: 1 TMS320C40 plus up to 3 TMS320C40 TIM modules Features: embedded
XDS-510 capability to allow connection to external target

Name: DT3801 Type: TMS320C40 IBM PC AT card Company: Data Translation
Processor: TMS320C40 40 MHz, 130 Kw SRAM, 4 Mbytes DRAM Analog I/O: A/D: 12 or
16 bits, 160 kHz to 1 MHz; D/A: 2x 16 bits, 100 kHz Features: 20 lines digital
I/O, 2 counters/timers, separate clocks for A/D, D/A

Name: TMS320C40 Parallel DSP System Type: IBM PC/AT card Company: Loughborough
Sound Images Processor: 2 TMS320C40 50 Mhz 64K words RAM Analog I/O:
Daughtercard expansion socketing. Comments: Uses TIM-40 compatible modules

Name: SPIRIT-40 AT/ISA Type: TMS320C40 IBM PC AT card Company: Sonitech
International Processor: TMS320C40 40 MHz, 1 Mbyte SRAM (expandable) Analog
I/O: available via serial port interface Features: serial, parallel ports

IBM PC boards, Texas Instruments TMS320C50 processors:
----------------------------------------------------------------------------
Name: TMS320C50 System board Type: TMS320C50 IBM PC AT card Company:
Loughborough Sound Images Processor: TMS320C50 50 MHz 32K words RAM Features:
65sq cm wire wrap area.

IBM PC boards, Texas Instruments TMS320M500 (Mwave) processor:
----------------------------------------------------------------------------
Name: Mwave multimedia platform Type: TMS320M500 (Mwave) IBM PC AT card
Company: Atlanta Signal Processors, Inc. (ASPI) [phone] Processor:
TMS320M500 33(?) MHz, 64 kbytes data SRAM, 96 kbytes prog SRAM Analog I/O:
stereo 16 bit A/D D/A, codec, telephone line interface Features: MIDI
interface, microphone input, speaker output

IBM PC boards, other processors:
----------------------------------------------------------------------------
Name: PDSP16488 Imaging/Graphics board Type: PDSP-16488 IBM PC card Company:
Spectrum Signal Processing [phone] Processor: PDSP-16488

Q4.1.2: Mac Nubus DSP development boards.

Mac Nubus boards, AT&T processors:
----------------------------------------------------------------------------

Name: MacDSP MB/A Type: DSP32C Apple Mac NuBus board Company: Spectral
Innovations [phone] Price: $3495-$4995 Processor: DSP32C 60 MHz DSP with
up to 1 Mbyte SRAM Comments: Optional 12 bit A/D card at 16 bit A/D, D/A with
1,2 or 8 channels

Mac Nubus boards, Motorola DSP56000 processor:
----------------------------------------------------------------------------
Name: MAC-56 Type: Macintosh NuBus DSP56001 card Company: Ariel Corp. (908)
249-2900 Processor: 56001 with 48-192K words RAM Comments: Comes with DSPworks
software

Name: AudioMedia II Type: Macintosh NuBus DSP56001 card Company: DigiDesign
Inc. [phone] Processor: 56001 @ 33.87 MHz with 8/4/4 K words P/X/Y RAM
Analog I/O: stereo 16 bit 44.1/48 kHz A/D, D/A (?) Features: SPDIF I/O.
Supported by DSP Designer software from Zola Technologies Inc.

Name: Sound Accelerator II Type: Macintosh NuBus DSP56001 card Company:
DigiDesign Inc. [phone] Processor: 56001 @ 33.87 MHz with 8/16/16 K
words P/X/Y RAM Features: Optional digital/analogue audio I/O unit available.
Supported by DSP Designer software from Zola Technologies Inc.

Name: Pro Tools Type: Macintosh NuBus 2 x DSP56001 card Company: DigiDesign
Inc. [phone] Processor: 2 x 56001 32 MHz, 8/16/16 K words P/X/Y RAM each
Features: Optional digital/analogue audio I/O unit available.
  Supported by DSP Designer software from Zola Technologies Inc.

Name of Board: DSP56001 Application Development System (ADS) Type: DSP56001
board for Mac II Company: Motorola Corp. [phone] Processor: DSP56001
Comments: This is an external board that interfaces to a variety of hosts,
including the Mac, via host-specific adaptor cards.

Mac Nubus boards, Motorola DSP96000 processor:
----------------------------------------------------------------------------
Name: DSP96002 Application Development System (ADS) Type: DSP96002 board for
Mac II Company: Motorola Corp. [phone] Processor: DSP96002 Comments:
This is an external board that interfaces to a variety of hosts, including the
Mac, via host-specific adaptor cards.

Mac Nubus boards, Texas Instruments processors:
----------------------------------------------------------------------------
Name: NB-DSP2300, 2301, 2305 Type: TMS320C30 board for Mac NuBus Company:
National Instruments [phone] Processor: TMS32C30 at 33 (2300), 27
(2301), or 40 (2305) MHz., 64K or 320K of memory, TMS320C30 to IEEE 754
translator hardware. Features: 16 bit "real time system integration" (RTSI)
peripheral bus.

Q4.1.3: SBus DSP development boards.

SBus boards, AT&T processors:
----------------------------------------------------------------------------
Name: S-32C Type: SBus Accelerator Board Company: Ariel Price: $2,995  ($5,795
with C compiler) Processor: AT&T DSP-32C 50MHz, 256 Kbytes to 4 Mbytes SRAM
Analog I/O: Interfaces with Ariel's ProPort & Digital Microphone

Name: MAXCOM Multimedia Processor Type: Dual DSP3210 Sbus card Company:
KINETICSYSTEMS Processor: Dual DSP3210 Analog I/O: multimedia audio codec and a
telephone quality codec. Comments: Complete ATT DSP board using real-time
operating system (VCOS) and ATT Multimedia Module Library to provide functions
for V.29/V.32 data/fax modems, speech recognition/synthesis, etc.

SBus boards, Motorola DSP56000 processor:
----------------------------------------------------------------------------
Name: S-56X Type: SBus Accelerator Board Company: Ariel (designed (and also
sold) by Berkeley Camera Engineering) Price: $2,495 / $2,995 Processor:
Motorola DSP56001 27 or 32 MHz, 32 Kw RAM Analog I/O: Digital Microphone,
ProPort or AES/EBU Features: DMA controller, Xilinx 3042 gate array for special
purpose I/O. (1.2 Mby/sec transfer rate using the S-56X, w/ ~3ms latency at DMA
page boundaries).

Name: VS-30 Type: SBus Dual Channel Telephone Signal Processor Company: Vigra
[phone] Price: $1375 Availability: In beta test Sep/Nov 1992 Processor:
DSP56001 (27 MHz) Analog I/O: 3 x 8KHz u-Law CODECs. (Line 1, Line 2, handset)
Features: Two RJ-11 telephone jacks, and local handset jack, DTMF transmit &
detect, hook switch control, ring detect, Call progress monitoring SunOS
drivers, programming library, demos.  All source code included.

SBus boards, Texas Instruments TMS320 processors:
----------------------------------------------------------------------------
Name: SPIRIT-30 SBus Type: 33 MFLOP Application Accelerator -- SBus Company:
Sonitech International Inc. [phone] Price: $8,995  ($9,795 for the 40
MFLOP board) Processor: TMS320C30 Analog I/O: Optional serial port box (extra
$1795), IC-100-1 16 bit single
    channel @ 100kHz or, DSP/AIB-1: A/D 2 ch., D/A 1 ch., sampling
    rate up to 20 kHz,anti-aliasing filters, telephone handset interface
    ($480).  Stereo audio and telephone interface card (1-22) for $695
    comes with SW library and demo programs. Features: Other options for the
A/D/A system are available.  Filter modules are extra.  Board runs the SPOX
operating system.  All of their boards are code compatible with each other (PC
and SUNs and VME).  Up to six SPIRIT-30 cards can be configured for a 240 MFlop
parallel processing system.

Name: SDSP/C30D Type: TMS320C30 SBus Processor Card Company: Loughborough Sound
Images Processor: TMS320C30 33 MHz 128Kwords RAM Comments: also available as
SDSP/C30S with SCSI interface

SBus boards, other processors:
----------------------------------------------------------------------------
Name: ADDA1418-166 Type: S-Bus A/D and D/A   (A/D and D/A are also available
separately) Company: Analyx Systems Inc.  [phone] Price: $2,495.00
(4-92) (A/D only $1,995, D/A only $1,895) Processor: None Analog I/O: 166 kHz
16 channel, 14 bit isolated A/D, 4 Channel 18 bit D/A Features: 32K Dual-Ported
on-board RAM.  Single S-Bus slot. All software included.

Q4.1.4: VMEbus DSP boards.

VMEbus boards, Analog Devices processors:
----------------------------------------------------------------------------
Name: ADSP-21020 IXD7232 Type: Dual ADSP-21020 VME bus board Company: Ixthos,
Inc. Processor: 2x ADSP-21020 512 Kbytes data/proc, 196 Kbytes prog/prc Analog
I/O: available via daughter card Features: I/O mezzanine, RS-232 port, digital
I/O option

VMEbus boards, AT&T processors:
----------------------------------------------------------------------------
Name: SURFboard Type: VMEbus DSP board Company: AT&T (Louis Rosa 908-582-5667
or Jim Snyder  [e-mail]) Price: $10K Processor: 6 DSP-32C's
organized as 2 sets of 3 processors
    (input, output, central -- can be configured) Analog I/O: None, but can
use Ariel ProPort VME board. Comments: Multiple boards can be chained together.
Central DSP's both have access to a 1Mbyte DRAM which is also the interface to
the VMEbus.  Input and output DSP's only have 2Kx32 memory.  Central DSP's also
have 256Kbytes of local SRAM.

Name: VME6U6 Type: VMEbus 6U DSP32C board Company: Communication Automation and
Control, Inc. (CACI) [phone] Processor: 6 DSP-32C 50 MHz, 512 Kbytes
SRAM each Analog I/O: available via mezzanine bus Features: TDM expansion port
to other boards, mezzanine bus Price: $10,900

Name: VME9U12 Type: VMEbus 9U DSP32C board Company: Communication Automation
and Control, Inc. (CACI) [phone] Processor: 12 DSP-32C 50 MHz, 128
Kbytes SRAM each (exp. to 512 Kby each) Analog I/O: available via local
mezzanine bus Features: TDM expansion port to other boards, mezzanine bus
Price: $18,800

Name: VE-32C Type: VMEbus 6U DSP32C four processor board Company: Valley
Technologies Processor: 4x DSP-32C 50 MHz, 8 Kw SRAM each (exp to 128 Kw each)
Features: 16 bit digital matrix switch for IPC

Name: UltraFFT Type: VME board (6U form factor) Company: Valley Technologies
Processor: 2x DSP32C ?? MHz; 2x Plessey PDSP16510 FFT processors

Name: UltraDSP Type: VME board (6U form factor) Company: Valley Technologies
Processor: DSP32C 40 MHz; Sharp LH9124 DSP

VMEbus boards, Motorola processors:
----------------------------------------------------------------------------
Name: V-56 DSP56001 VME board Type: DSP56001 VME bus card Company: Ariel Corp.
[phone] Processor: 27 MHz Motorola DSP56001, 32Kw P RAM, 64Kw data RAM
Features: EPROM boot, 24 bit parallel I/O, serial drivers, 24 bit ADBus
peripheral expansion port. Analog I/O: None.

Name: DSP56001 VME board Type: DSP56001 VME bus card Company: Spectrum Signal
Processing [phone] Processor: 2x Motorola DSP56200 10MHz 24K words RAM
Analog I/O: dual channel 16 bit 153 kHz A/D, D/A

Name: Versatile Array Signal Processor Type: VME-based three board (or more)
set Company: Spectrum Signal Processing [phone] Processor: 5x DSP96002
Comments: contains (1) general signal processing board (four processor DSP96002
VME board), (2) I/O processor board (DSP96002 VME board), (3) two-port memory
board (4Mx64 bit dual port memory).

Name: MMI-105 Single Channel Audio/Signal Processor Type: VME board Company:
Vigra Processor: 20 MHz 56001 DSP (27 Mhz optional) 8K SRAM and 1 Meg ($1895)
    or 8 Meg ($2995) DRAM Analog I/O: 14 bit A/D and D/A; 8, 13.6, and 19 KHz
sampling rates. Features: Mic & line inputs, power amp & line outputs.

Name: MMI-210 Signal/Audio Processor Type: VME board Company: Vigra Processor:
2x 27 MHz 56001 DSPs 8K SRAM (32K optional) and 1 Meg ($2995)
    or 4 Meg ($3650) DRAM Analog I/O: 16 bit A/D and D/A; 8, 16, 32, 44.1,
48, 96 Ksamples/sec Features: Line and mic inputs, line and power amp outputs.

Name: MMI-420 Four Channel Signal Processor Type: VME board Company: Vigra
Price: $3225 Processor: 4 56001's 27 MHz - 96K SRAM and 16K EPROM per DSP
Features: 4 Megs multi-ported DRAM

Name: MMI-4210 Four Channel Signal/Audio Processor Type: VME board Company:
Vigra Price: $5950 Processor: 4x 56001's 27 MHz, 96K SRAM and 16K EPROM per DSP
Analog I/O: 4 16-bit A/D and 4 18-bit D/A converters, 1-50 kHz sample rate.
Features: Transformer or direct-coupled analog I/O.  Programmable output
mixing, input and output gain levels.  Digital mixing, speech energy detection,
and ADPCM on firmware.

VMEbus boards, Texas Instruments processors:
----------------------------------------------------------------------------
Name: HEXC31 Type: 6U VMEbus 6 processor DSP card Company: Analogic Processor:
6x TMS320C31 40 MHz, 512 kw SRAM/proc, 16 MB DRAM,

Name: Banshee/VME Type: VMEbus DSP accelerator card Company: Atlanta Signal
Processors, Inc. Price: starts at $4,995 Processor: TMS320C30 Analog I/O:
available as a separate daughter board. Features: Programming tools can be used
through any PC-compatible computer (separate debugging port).

Name: Ranger Type: VME board Company: Image and Signal Processing Processor: up
to 4 TMS320C30 Comments: Some libraries included.

Name: Clipper Type: VME board Company: Image and Signal Processing Processor:
up to 6 TMS320C40

Name: MZ 7770 Quad C40 DSP engine Type: VMEbus 6U DSP board Company: Mizar
Processor: 4x TMS320C40 50 MHz, 1 Mbyte SRAM per proc, 1 Mbyte global SRAM
Features: 512 Kbyte flash EEPROM

Name: HyperFlo DSP-3 Type: 6U VMEbus 3 processor DSP card (plus 68030 GP CPU)
Company: Pacific Cyber/Metrix, Inc. Processor: 3x TMS320C30 40 MHz, 512 Kbytes
SRAM/proc; 68030 general purpose CPU Features: 3x 36 bit parallel I/O ports,
fifos between processors

Name: HyperFlo DSP-4 Type: 6U (?) VMEbus 3 or 6 processor DSP card (plus 68040
GP CPU) Company: Pacific Cyber/Metrix, Inc. Processor: 3x or 6x TMS320C40 40
MHz; 68040 general purpose CPU

Name: HyperFlo DSP-38 Type: 6U VMEbus 3 processor DSP card (plus 68030 GP CPU)
Company: Pacific Cyber/Metrix, Inc. Processor: 3x TMS320C30 40 MHz, 512 Kbytes
SRAM/proc; 68030 general purpose CPU Features: like DSP-3, but with MAXbus
video interface

Name: Triple TMS320C25 Processor Baseboard (4282) Type: VMEbus DSP board
Company: Pentek, [phone] Processor: 1x 20 MHz TMS320C25 master processor
with 32Kx16 SRAM, 32Kx16 EPROM; 2x 40 MHz TMS320C25 slave processors with 8Kx16
SRAM (accessible by master). Features: 1Kx16 dual-port RAM between VMEbus and
master processor.

Name: TMS320C30 Processor MIX Baseboard (4283) Type: VMEbus DSP board Company:
Pentek, [phone] Processor: TMS320C30, 32 MHz, 256 KB SRAM,  128 KB
EPROM, 1, 4, or 8 MB dual-port RAM. Analog I/O: available as separate daughter
board. Features: MIX expansion bus, 17 pin I/O timer connector Comments: the
MIX expansion bus allows up to three additional MIX DSP boards to be attached
to the 320C30 baseboard.  MIX boards available from Pentek include: 1 processor
TMS320C30; 2 processor TMS320C30; 3 processor AT&T DSP32C; 1 processor
TMS320C40; 2 processor TMS320C40; and a variety of analog and digital I/O
interface boards.

Name: SKY Challenger Type: VMEbus DSP board Company: SKY Computers Processor:
2x TMS320C30

Name: SPIRIT-30 VME Type: VME board Company: Sonitech International Processor:
TMS320C30 33 MHz, 256 Kbytes SRAM (expandable) Analog I/O: available via serial
port Features: serial, parallel port; mezzanine bus

Name: Dual TMS320C30 VME board Type: Dual processor TMS320C30 VME board
Company: Spectrum Signal Processing [phone] Processor: 2x TMS320C30 33
MHz, 64K words RAM per processor Analog I/O: optional dual 18 bit 200 kHz A/D,
D/A Comments: 6U Eurocard format

VMEbus boards, other processors:
----------------------------------------------------------------------------
Name: CRV1M40 Type: VME board (6U form factor) Company: Catalina Research Inc.,
[phone] Processor: Sharp LH9124/9320 40 MHz Analog I/O: None (?)
Features: 8K of VME address space, 16 pages of 32kx16 program space, mezzanine.

(See also: Valley UltraFFT and UltraDSP, under the VMEbus AT&T processor
section, above).

Q4.1.5: DSP development boards for the NeXT bus.
----------------------------------------------------------------------------
Name: QP-56 Type: Five processor DSP56001 card for NeXT NextBus Company: Ariel
Corp. [phone] Processor: 5x DSP56001 26 MHz  8K/16K words RAM per
processor Features: Five NeXT compatible DB-15 ports.

Q4.1.6: DSP development boards for the SCSI bus.
----------------------------------------------------------------------------
Name: DSP-32C Type: SCSI Interface DSP Board (actually a PC board which can be
    accessed through an on board SCSI port). Company: Ariel Price: $3,495
Processor: AT&T DSP-32C Analog I/O: 16 bit analog I/O Comments: Includes the
PDS-32C Program Development Software.

Name: DeskLab Type: SCSI data collection/analysis box Company: Gradient (609)
387-8688 Price: $5,500 Processor: ? Analog I/O: 14 bit A/D D/A, Telephone
interface is available. Comments: Complete package of data collection and
analysis tools under UNIX. It is not possible (supported) to directly access
the DSP that is in the box nor can user specified functions be run using their
analysis package.

Name: SKYstation Type: DSP vectorizing accelerator for sparc workstations
Company: SKY Computers  [phone] Price: $10K and up (depends on amount of
memory required) Processor: Intel I860/960 Analog I/O: None. Comments:
Vectorizing C and FORTRAN compilers available. Math library(hand coded) also
available. Company also makes VME cards with similar features.

Name: DAT-Link and DAT-Link+ Type: Standalone SCSI unit Company: Townshend
Computer Tools [phone] Price: US: $4,000-$4,500 Processor: DSP-32C with
64k RAM, expandable to 2Mbytes. Features: AES/EBU interface. Comments: Full
networked software with server, applications and libraries including source.
Real time playback/recording of stereo audio files. Trainable IR transceiver -
control any device with IR remote control. Works with any UNIX work-station
that has SCSI.

Q4.1.7: Standalone DSP development boards
----------------------------------------------------------------------------

Name: EZ-LAB kit Type: ADSP-2101 stand alone evaluation module Company: Analog
Devices Processor: ADSP-2101 Features: needs power supply, speaker, and
microphone.  Comes with PC development software and some canned demos.

Name: ADSP-2105 DSP-11B, ADSP-2101 DSP-11S Type: ADSP-2105 and ADSP-2101
stand-alone DSP boards Company: Innovative Devices Processor: ADSP-2105 or
ADSP-2101 Analog I/O: 4x 14 bit A/D, 2x 14 bit D/A. Comments: 3"x5" stand-alone
DSP board.

Name: MX31 Modular Embedded System Type: TMS320C31 stand-alone board Company:
Integrated Motions, Inc. (IMI) Processor: TMS320C31 33 MHz; 16, 64, or 256 Kw
RAM; 16 or 64 Kw ROM Features: 88 pin expansion bus, 16 bits parallel I/O, 2
RS-232, 3 int lines Comments: 4"x5" board designed for use in embedded systems;
other cards of same form factor under development.

Name: AE2000 Type: TMS320C31 board Company: Intellibit Processor: TMS320C31
Comments: Board is only 3"x2.5".

Name: MC68HC16EVB Type: Motorola 86HC16 standalone board Company: Motorola
Processor: 68HC16 Analog I/O: 8 bit or 10 bit A/D, D/A requires obtional chip
Features: Includes assembler, simulator, demo C compiler that run on an IBM PC
and communicates via printer port. Comments: Motorola has been pushing the
68HC16 as a low-end DSP, even though it's not what most DSP folks think of when
they say "DSP".

Board name: ADSP-2101 based 4 kbps voice codec module Type: ADSP-2101 stand
alone module? Company: Specom Technologies Processor: ADSP-2101 Features: Voice
coding based on CELP. Comments: stand-alone module?

Name: ADSP-2105 Based digital voice playback system Type: ADSP-2105 stand alone
module? Company: Specom Technologies Processor: ADSP-2105 Comments: stores up
to 2 hours of speech

Name: 56SB System Type: 56001 Stand-alone system Company: Precision Design
Services Processor: 56001 20 MHz Price: Aus$1450 Analog I/O: 16 bit 100kHz ADC,
2x 16 bit 500kHz DAC Comments: PC monitor software, RS232C Port, Filter design
software.
 Extensive macro library also available(Aus$300).
==========================================================================

Q4.2: Who makes AES/EBU digital audio transceiver chips?

Several companies:

Sony Corp.: CX23033 transmitter, CX23053 receiver. Comments: the Sony receiver
chip is very difficult to work with due to a bad PLL design.

Crystal Semiconductor Corp., [phone] CS8411 and CS8412 receivers, CS8401
and CS8402 transmitters. Comment: the 8411 and 8401 are designed for use with
microprocessors/DSPs. The 8412 and 8402 are intended for use in stand-alone
applications.

Motorola Corp. [phone] or [phone] (DSP marketing) DSP56401
transceiver. Comment: designed for use with the DSP56000.

Yamaha: YM3613B transmitter, YM3623B receiver, YM3436 receiver, YM3437
transmitter.

References:

Kahrs, Mark, "An AES/EBU Circuit Compendium or AES/EBU Circuits I Have Known
and Loved," presented at the 91st Convention of the Audio Engineering Society,
October 4-8, 1991.  Reprints: AES, 60 East 42nd St., New York, NY, 10165.

==========================================================================

Q5.0 What DSP Operating Systems are available. [This was researched and written
by Chuck Corley ([e-mail])]

        The need to use an operating system for a DSP processor seems to depend
on the task(s) to be performed.  For small or simple DSP tasks where the DSP is
doing only a single simple repetitive function, an operating system is probably
not needed.

        As the number and complexity of DSP tasks increase, an operating system
of some type may be needed in order to allocate system resources (RAM, etc.)
and to perform multi-tasking, where several tasks take turns executing.

        An example:  A DSP processor may be required to perform non-DSP jobs in
order to eliminate a 'host' processor.  An operating system may be needed in
order to share processing time and resources between the DSP and non-DSP tasks.

        An option for some DSP applications is to write your own DSP
task-switching or job allocating 'operating system'.  Whether this is the right
choice for you depends on how involved you need to make your operating system,
and how much time you have available to spend on writing it.

        A number of companies now offer pre-written operating systems that
execute on DSP processors.  In exchange for your money they offer to save you
the time and effort of writing and debugging your own 'operating system' or
'task switcher' or 'resource allocator'.

        These companies describe their products as 'real-time' operating
systems.  What 'real-time' means is debated, but normally it means that the
maximum time for the operating system to respond to an external event is known.
The calculation for measuring this time involves summing together interrupt
response time, task switching time, and other processor and operating system
benchmarks.  'Real-time' usually also means 'fast'.  Often embedded CPU or DSP
tasks require a 'real-time' (known) response time.

        Prices and features vary.  All companies charge for purchasing their
'development environment', which allows you to develop code which runs on their
operating system.  Some companies also charge a fee for each product you create
or sell that includes their operating system software.  This is usually called
a 'target fee' or 'runtime license' fee.  Some operating systems have no
'runtime license' fees.

        As a general precaution, when there are runtime license fees, it is
*very* important to negotiate in advance what the license fee will be.  If this
price is not agreed upon (in writing, most likely) at the time the development
system is purchased, you could be in a very bad position.  You will have
invested a lot of time and effort writing code to work with a particular
operating system, and when your creation is produced you could discover that
the 'runtime license fee' has increased for some reason.  Considering the
amount of work you would have invested in that operating system, you would be
in a very poor bargaining position.

        Features for 4 different DSP operating systems are listed below. Keep
in mind a 'No' answer doesn't necessarily mean that the operating system is
deficient.  Some companies felt certain features were not appropriate for
either a 'DSP' or a 'real-time' operating system, and so they did not implement
them.  Other companies didn't implement features because they were not
appropriate for their targeted users.

        The information below was collected from phone calls and marketing
literature, and is not necessarily accurate.  You should contact the vendors
listed below for the best and most up-to-date information.

Operating System Features:    Byte-BOS    Nucleus     RXTC        SPOX
--------------------------    --------    -------     ----        ----
Preemptive Task Scheduling    Yes         Yes         Yes         Yes
Time-Sliced Task Scheduling   Yes         Yes         Yes         No
Round-Robin Task Scheduling   ?           Yes         Yes         No
Inter-Task Messages           Yes         Yes         Yes         Yes
Memory Management             Yes         Yes         Yes         Yes
Interrupt Management          Yes         No          Yes         Yes
Timer Management              Yes         Yes         Yes         No
Device-Independent I/O        No          No          No          Yes
Stream I/O                    Serial-$495 No          No          Yes
DSP Math Library              No          No          No          $4000
C Run-Time Library            No          No          No          $2000
Source Code Included          Yes         Yes         Yes         No
Source Code Type              ANSI-C      ANSI-C      ASM/ANSI-C  ASM/ANSI-C
OS RAM/ROM Size (Bytes)       5K-40K      4K-20K      12K-16K     44K+
Demo Disk Available           ?           Yes         Yes         ?
Development License Type      Site        Prod Line   Site        Computer
Run-Time License Fee          None        None        None        $25-$200
Development License Cost      $1995       $4995       $995-$4195  $6000-$12000

OS System-Level Debugger:     Byte-BOS    Nucleus     RXTC        SPOX
--------------------------    --------    -------     ----        ----
Basic Debugging Functions     Yes         Yes         Yes         Yes
Performance Timer             Yes         Yes         No          Yes
Debugger Cost                 $295        $750        $0          $5000

        Information on the 'Helios' distributed parallel processing operating
system was not available at this time, but their address is listed below.

'Byte-BOS' is available from:

   Byte-BOS
   P.O. Box 3067
   Del Mar, CA    92014

   Phone : [phone]
   Toll Free : 800-788-7288

   Supported DSPs: TI 320C2x/C3x/C5x
   Other CPUs:     80x86, V25/V35/V40/V50, Z80, Z180, 64180, 37700,
                   680x0, 68332, 68340, 68302,
                   8051, 8096, 80188/86, 68HC11, 68HC16, 6301/3

'Helios' (for distributed parallel processing) is available from:

   Perihelion Software Limited
   The Maltings
   Charlton Road, Shpeton Mallet
   Somerset, United Kingdom  BA4 5QE

   Phone : (44) (0) 373-344345
   Fax : (44) (0) 373-344977

'Nucleus' is available from:

   Accelerated Technology
   P.O. Box 850245
   Mobile, Alabama 36685, USA

   Phone:     [phone]
   Toll free: (800) 468-NUKE
   Fax:         [phone]

   Supported DSPs: TI 320C2x/C3x/C4x/C5x, Motorola 56xxx, Analog Devices 21xxx
   Other CPUs:     Am29xxx, R3000, SPARC, i960, 680xx, 683xx, 80x86

'RTXC' and 'RTXC/MP' (a parallel processing version) are available from:

   AT Barrett & Associates
   11501 Chimney Rock
   Houston, Texas  77035

   Phone : [phone]
   Toll Free : 800-525-4302
   Fax : [phone]

   Supported DSPs: TI 320C3x
   Other CPUs:     680x0, 68332/331/340, 68302, 68HC16, 68HC11, 6803,
                   80x86, 80x96, 80x51, T400/800, Z80/Z180

 'SPOX' and 'SPOX-MP' (a parallel-processing version) are available from:

   Spectron Microsystems
   5266 Hollister Ave
   Santa Barbara, CS 93111, USA

   Phone:     [phone]
   Fax:         [phone]

   Supported DSPs: TI 320CC3x/C4x/C5x, Motorola 56xxx, Analog Devices 21xxx

5. Manufacturer's addresses and telephone numbers.

Analog Devices 1 Technology Way P.O. Box 9106 Norwood, MA  02062-9106 Phone:
[phone] Phone: [phone] (DSP applications assistance) Phone: (617)
461-3881 (DSP marketing)

-----

Analogic 8 Centennial Dr. Peabody, MA  01960-7987 Phone: [phone] x. 3468
FAX: [phone]

-----

Ariel Corp. 433 River Road Highland Park, NJ 08904 Phone: [phone] FAX:
[phone] BBS: [phone] Email: [e-mail]

-----

AT&T Microelectronics Dept. AL-520404200 55 Union Blvd. Allentown, PA  18103
Phone: [phone] FAX: (215) 778=4106

-----

Atlanta Signal Processors, Inc. (ASPI) 770 Spring St. Atlanta, GA 30308 Phone:
[phone] FAX: [phone]

----

Berkeley Camera Engineering 3616 Skyline Drive Hayward, CA 94542 Phone: (510)
889-6960 FAX: [phone] Email: [e-mail]

-----

BittWare Research Systems, Inc. Inner Harbor Center, 8th Floor 400 East Pratt
Street Baltimore, MD 21202 Phone: [phone] FAX: [phone]

-----

Bridgenorth Signal Processing, Inc. P.O. Box 469 Custer, WA  98240 Phone: (604)
538-0003 FAX: [phone]

-----

Catalina Research Inc. Colorado Springs [phone]

-----

CMS GmbH Postfach 100202 Einsteinstrabe 61-63 D-7505 Ettlingen Germany Phone:
(07243) 31001

-----

Communication Automation and Control, Inc. (CACI) 1642 Union Blvd., Suite 200
Allentown, PA  18103-1510 [phone] FAX: [phone]

-----

Computer Continuum 75 Southgate Avenue Daly City,  CA 94015 [phone]

-----

Crystal Semiconductor Corp. P.O. Box 17847 Austin, TX  78760 Phone: (512)
445-7222 FAX: [phone]

-----

Current Technology, Inc. 99 Madbury Road Durham, N.H. 03824 Phone: (603)
868-2270 FAX: [phone]

-----

Data Translation 100 Locke Dr. Marlboro, MA 01752-1192 [phone] (800)
525-8528

-----

Dalanco Spry 89 Westland Ave. Rochester, NY  14618 Phone: [phone]

-----

DigiDesign Inc 1360 Willow Road, Suite 101 Menlo Park CA 94025 Tel: [phone]
327 8811 FAX: [phone]

-----

DSP Research 391 Balsam Ave. (OR Possibly: 1095 E. Duane Ave) {Someone
clarify?} Sunnyvale, CA 94086 Phone: [phone] FAX: [phone]

-----

EnterTec, Inc. P.O. Box 8858 Richmond, VA 23225 Phone: [phone] FAX: (804)
353-7134

-----

Hollis Electronics Co. 5 Northern Blvd., Unit 13 Amherst, NH  03031 Phone:
[phone]

-----

Image & Signal Processing 120 Linden Avenue Long Beach CA 90802 Phone: (213)
495-9533 FAX: [phone]

----

Innovative Devices, Inc. 1119 Damelart Way Brentwood Bay, B.C.  V0S 1A0 Canada
Phone: [phone]

-----

Integrated Motions, Inc. (IMI) 758 Gilman St. Berkeley, CA  94710 (510)
527-5810 FAX: [phone]

-----

Integrated Technologies Solutions, Inc. 402 Chestnut Ln. East Meadow, NY  11554
[phone] FAX: [phone]

-----

Intellibit P.O. Box 9785 McLean, VA  22102-0785 Phone: [phone] FAX:
[phone]

-----

Ixthos, Inc. 12210 Plum Orchard Drive Silver Spring, MD  20904 Phone: (301)
890-1000

-----

KINETICSYSTEMS in USA: William Ponton Tel: [phone] FAX: [phone] in
Europe: Tel: [phone] FAX: [phone]

-----

Logabex ZI de Montaudran 3 Avenue Didier Daurat 31400 Toulouse France Phone:
(33) 61-80-94-37

-----

Loughborough Sound Images Ltd The Technology Centre Epinal Way Loughborough
Leics LE11 OQE England Phone: [phone] FAX: [phone] N.B.
U.S. distributor is Spectrum Signal Processing (see below)

-----

Mizar 2410 Luna Rd. Carrolton, TX 75006 [phone] FAX: [phone]

-----

Motorola Corp. DSP Operation Mail Drop OE314 6501 William Cannon Drive, West
Austin, TX 78735-8598 Phone: [phone] (marketing) BBS: (512) 891-DSP1
(300/1200 bps) BBS: (512) 891-DSP2 (1200 bps V.22) BBS: (512) 891-DSP3 (2400
bps V.22bis)

----- Motorola Ltd. Motorola Literature Centre 88 Tanners Drive Blakelands
Milton Keynes MK145BP Great Britain

-----

National Instruments 6504 Bridge Point Parkway Austin, TX  78730-5039 Phone:
[phone] Phone: [phone] FAX: [phone]

-----

Natural Microsystems Corp. 8 Erie Drive Natick, MA 01760-1313 Phone: (800)
533-6120

-----

Pacific Cyber/Metrix, Inc 6805 Sierra Ct. Dublin, CA  94568-2615 [phone]
FAX: [phone]

-----

Pentek, Inc. 55 Walnut St. Norwood, NJ  07648 Phone: [phone] FAX: (201)
767-3994

-----

Precision Design Services PTY LTD, P.O. Box 61 Berwick, Victoria, 3806
Australia TEL: [phone] FAX: [phone] -----

Prime Ideal Joseph Virzi 2124 Parker Street #300 Berkeley, CA 94704 Phone:
[phone]

-----

Quantawave [phone]

-----

Saddle Point Systems 3960 Greenwood Ave. Oakland, CA  94602 Phone: (510)
530-0971

-----

Sharp Microelectronics Technology, Inc. 5700 NW Pacific Rim Blvd Camas, WA
98607 Phone: [phone] FAX: [phone]

-----

Signal-Data 63 Vester Paradisvej DK-2840 Holte Denmark Phone: [phone]
Phone: [phone]

-----

Sonitech International Inc. 14 Mica Ln. Wellesley, MA 02181 [phone] FAX:
[phone]

-----

Specom Technologies Corp. 3673 Enochs Street Santa Clara, CA 95051 Phone: (408)
736-7832 FAX: [phone]

-----

Spectral Innovations Santa Clara, CA [phone]

-----

Spectrum Signal Processing Westborough Office Park 1500 West Park Drive
Westborough MA 01581 USA Phone: [phone] FAX: [phone]

-----

Texas Instruments Incorporated P.O. Box 1443  M/S 737 Houston, TX  77251-1443
[phone]   (voice) [phone]   (fax) [phone]   (BBS  300-9600
N,8,1) [e-mail]   (Internet email)

-----

Townshend Computer Tools Phone: [phone], FAX: [phone] E-Mail:
[e-mail]

-----

Tucker-Davis Technologies 4639 NW 6th St., Suite A Gainesville, FL  32609 (904)
375-1623 FAX: [phone]

-----

Valley Technologies, Inc. RD #4, Rt. 309 Tamaqua, PA  18252 [phone] FAX:
[phone]

-----

Virga, Inc. 4901 Morena Blvd. Bldg. 502 San Diego, CA 92117 [phone]

-----

Wavetron Microsystems 1135 Oddstad Drive Redwood City, CA 94063 Phone: (415)
366-5371 or [phone]

=============================================================================
Questions, comments, or submissions for this FAQ should be mailed to
[e-mail], ...!ucbvax!ohm!comp-dsp-faq.  Thanks!