Nebula 1994 June/NEBULA_SE.ISO/Documents/FAQ/Audio-fmts-faq/diff

Internet Message Format | 1993-07-20 | 12.5 KB

Path: senator-bedfellow.mit.edu!bloom-beacon.mit.edu!spool.mu.edu!sdd.hp.com!swrinde!cs.utexas.edu!uunet!mcsun!sun4nl!cwi.nl!guido
From: [e-mail] (Guido van Rossum)
Newsgroups: alt.binaries.sounds.misc,alt.binaries.sounds.d,comp.dsp,comp.answers,news.answers
Subject: Changes to: FAQ: Audio File Formats
Message-ID: <[e-mail]>
Date: 19 Jul 93 14:14:28 GMT
Expires: 16 Aug 93 14:13:54 GMT
Sender: [e-mail]
Reply-To: [e-mail]
Followup-To: alt.binaries.sounds.d,comp.dsp
Lines: 333
Approved: [e-mail]
Supersedes: <[e-mail]>
Xref: senator-bedfellow.mit.edu alt.binaries.sounds.misc:8710 alt.binaries.sounds.d:3429 comp.dsp:6707 comp.answers:1342 news.answers:10511

Archive-name: audio-fmts/diff
Submitted-by: Guido van Rossum <[e-mail]>
Version: 3.04
Last-modified: 19-Jul1993

*** 1.3    1993/06/15 09:22:23
--- audio.part1    1993/07/19 14:08:13
***************
*** 8,11 ****
  Submitted-by: Guido van Rossum <[e-mail]>
! Version: 3.03
! Last-modified: 15-Jun-1993

--- 8,11 ----
  Submitted-by: Guido van Rossum <[e-mail]>
! Version: 3.04
! Last-modified: 19-Jul-1993

***************
*** 121,123 ****
  like a tiny floating point number; however, their dynamic range is
! that of 14 bit linear data.  Source for converting to/from U-LAW
  (written by Jef Poskanzer) is distributed as part of the SOX package
--- 121,123 ----
  like a tiny floating point number; however, their dynamic range is
! that of 12 bit linear data.  Source for converting to/from U-LAW
  (written by Jef Poskanzer) is distributed as part of the SOX package
***************
*** 216,223 ****
  Public standards for voice compression are slowly gaining popularity,
! e.g. CCITT G.721 and G.723 (ADPCM at 32 and 24 kbits/sec).  (ADPCM ==
! Adaptive Delta Pulse Code Modulation.)  Free source code for a *fast*
! 32 kbits/sec ADPCM algorithm is available by ftp from ftp.cwi.nl as
! /pub/adpcm.shar.  (** NOTE: if you are using v1.0, you should get
! v1.1, released 17-Dec-1992, which fixes a serious bug -- the quality
! of v1.1 is claimed to be better than uLAW **)

--- 216,229 ----
  Public standards for voice compression are slowly gaining popularity,
! e.g. CCITT G.721 (ADPCM at 32 kbits/sec) and G.723 (ADPCM at 24 and 40
! kbits/sec).  (ADPCM == Adaptive Delta Pulse Code Modulation.)  Sun
! Microsoft has placed the source code of a portable implementation of
! these algorithms (as well as G.711, which defines A-LAW and U-LAW) in
! the public domain (needless to say, their proprietary implementation
! distributed in binary form with Solaris is better :-).  One place to
! ftp this source code from is ftp.cwi.nl:/pub/audio/ccitt-adpcm.tar.Z.
! Source for another 32 kbits/sec ADPCM implementation, assumed to be
! compatible with Intel's DVI audio format, can be ftp'ed from
! ftp.cwi.nl:/pub/audio/adpcm.shar.  (** NOTE: if you are using v1.0,
! you should get v1.1, released 17-Dec-1992, which fixes a serious bug
! -- the quality of v1.1 is claimed to be better than U-LAW **)

***************
*** 232,233 ****
--- 238,245 ----

+ Tony Robinson <[e-mail]> has written a good FAST loss-less
+ compression for lots of different audio formats (particularly good for
+ WAV and MOD files).  The software is available by anonymous ftp from
+ svr-ftp.eng.cam.ac.uk [129.169.24.20], directory misc, file
+ shorten-1.08.tar.Z.
+
  (Note that U-LAW and silence detection can also be considered
***************
*** 313,315 ****
--- 325,329 ----
  DEC 3000/300-500    U-LAW           8k                   1
+ DEC 5000/20-25      U-LAW           8k                   1
  Tandy 1000/*L*      8               22k                  3
+ Tandy 2500          8               22k                  3
  HP9000/705,710,425e U,A-LAW,16      8k                   1
***************
*** 338,339 ****
--- 352,359 ----

+ Notes for the DECstation 5000/20-25: You need either XMedia tools from
+ DEC ($$$$), or the AudioFile package (which works nicely) from
+ crl.dec.com (see below). The audio device is "/dev/bba", you cannot
+ send ".au" files directly to the device, the Xmedia/AF software
+ provide an "audioserver" which must be run to play/record sounds.
+
  The SGI Personal IRIS 4D/30 and 4D/35 have the same capabilities as
***************
*** 654,657 ****

! The Tandy 1000 uses a (proprietary?) compressed format.  There is a
! PD Mac to Tandy conversion program called CONVERT.

--- 674,680 ----

! The Tandy 1000 uses a (proprietary?) compressed format.  There is a PD
! Mac to Tandy conversion program called CONVERT.  Leonard Erickson
! <[e-mail]> writes: There is a WAV driver from Tandy
! if people ask.  There also appears to be a program that purports to
! convert other formats to Tandy, but I haven't tested this one yet.

*** 1.3    1993/06/15 09:22:23
--- audio.part2    1993/07/19 14:08:58
***************
*** 8,11 ****
  Submitted-by: Guido van Rossum <[e-mail]>
! Version: 3.03
! Last-modified: 15-Jun-1993

--- 8,11 ----
  Submitted-by: Guido van Rossum <[e-mail]>
! Version: 3.04
! Last-modified: 19-Jul-1993

***************
*** 518,543 ****

! From: Joe Campbell  N3JBC  [e-mail]  [e-mail]

! The U.S. DoD's Federal-Standard-1016 4800 bps code excited linear prediction
! voice coder version 3.2 (CELP 3.2) Fortran and C simulation source codes are
! now 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)
!
! In addition to the source codes, example input and processed speech files
! are included along with a technical information bulletin to assist in
! implementation of FS-1016 CELP.  (An anonymous ftp site is being considered
! for future releases.)
!
! Copies of the FS-1016 document are available for $2.50 each from:
!
! GSA Rm 6654
! 7th & D St SW
! Washington, D.C.  20407
! 1-202-708-9205

--- 518,552 ----

! From: [e-mail] (Joe Campbell)

! The U.S. DoD's Federal-Standard-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 (on DOS
! diskettes, but configured to compile on Sun SPARC stations) from NTIS
! and DTIC.  Example input and processed speech files are included.  A
! Technical Information Bulletin (TIB), "Details to Assist in
! Implementation of Federal Standard 1016 CELP," 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 also available.
!
! This is available through the National Technical Information Service:
!
! NTIS
! U.S. Department of Commerce
! 5285 Port Royal Road
! Springfield, VA  22161
! USA
! [phone]
!
! The "AD" ordering number for the CELP software is AD M000 118
! (US$ 90.00) and for the TIB it's AD A256 629 (US$ 17.50).  The LPC-10
! standard, described below, is FIPS Pub 137 (US$ 12.50).  There is a
! $3.00 shipping charge on all U.S. orders.  The telephone number for
! their automated system is 703-487-4650, or 703-487-4600 if you'd prefer
! to talk with a real person.
!
! (U.S. DoD personnel and contractors can receive the package from the
! Defense Technical Information Center:  DTIC, Building 5, Cameron
! Station, Alexandria, VA 22304-6145.  Their telephone number is
! 703-274-7633.)

***************
*** 559,563 ****

- For U.S. FED-STD-1016 (4800 bps CELP) _realtime_ DSP code
- and information about products using this code, contact:

  John DellaMorte
--- 568,601 ----


+ The U.S. DoD's Federal-Standard-1015/NATO-STANAG-4198 based 2400 bps
+ linear prediction coder (LPC-10) was republished as a Federal
+ Information Processing Standards Publication 137 (FIPS Pub 137).
+ It is described in:
+
+ Thomas E. Tremain, "The Government Standard Linear Predictive Coding
+ Algorithm:  LPC-10," Speech Technology Magazine, April 1982, p. 40-49.
+
+ There is also a section about FS-1015 in the book:
+ Panos E. Papamichalis, Practical Approaches to Speech Coding,
+ Prentice-Hall, 1987.
+
+ The voicing classifier used in the enhanced LPC-10 (LPC-10e) is described in:
+ Campbell, Joseph P., Jr. and T. E. Tremain, "Voiced/Unvoiced Classification
+ of Speech with Applications to the U.S. Government LPC-10E Algorithm,"
+ Proceedings of the IEEE International Conference on Acoustics, Speech, and
+ Signal Processing, 1986, p. 473-6.
+
+ Copies of 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 available for US$ 5.00 each from:
+
+ GSA Federal Supply Service Bureau
+ Specification Section, Suite 8100
+ 470 E. L'Enfant Place, S.W.
+ Washington, DC  20407
+ [phone]
+
+ Realtime DSP code for FS-1015 and FS-1016 is sold by:
+
  John DellaMorte
***************
*** 566,567 ****
--- 604,606 ----
  Bedford, MA  01730
+ USA
  1-617-275-3733
***************
*** 570,582 ****

! DSP Software Engineering's code can run on a DSP Research's Tiger 30 board
! (a PC board with a TMS320C3x and analog interface suited to development work)
! or on Intellibit's AE2000 TMS320C31 based 3" by 2.5" card.
!
! DSP Research                Intellibit
! 1095 E. Duane Ave.          P.O. Box 9785
! Sunnyvale, CA  94086        McLean, VA  22102-0785
! [phone]               [phone]
! [phone] (fax)         [phone] (fax)

! From: [e-mail] (Richard Tobias )

--- 609,621 ----

! DSP Software Engineering's FS-1016 code can run on a DSP Research's Tiger 30
! (a PC board with a TMS320C3x and analog interface suited to development work).
!
! DSP Research
! 1095 E. Duane Ave.
! Sunnyvale, CA  94086
! USA
! [phone]
! [phone] (fax)

! From: [e-mail] (Richard Tobias)

***************
*** 593,623 ****

! Newsgroups: comp.dsp
! From: [e-mail] (Bruce Erickson)
! Subject: Re: FTP site for CELP audio compression source?
!
! In comp.dsp (subj: FTP site for CELP audio compression source?), Joe
! Campbell writes:
! > I would like to mention that a document, that is a vital part of the CELP
! > release package, is not available in electronic form.  Therefore, I urge
! > anyone who is seriously interested in this coder to obtain this document:
! >
! >  Details to Assist in Implementation of Federal Standard 1016 CELP.
! >  National Communications System, Office of Technology & Standards, 1992.
! >  Technical Information Bulletin 92-1.
! [Available for free from Bob Fenichel above --GvR]
!
! I would also like to mention that when Bob gave me permission to put the
! CELP disks on wsmr-simutel he asked for people who fetch them to let
! him know that they have them.
!
! So if you grab the sources -- from whatever source -- please give him
! a call or send him USmail.
!
! I am still waiting for wsmr-simutel to let me know how to upload the CELP
! disks -- I will be sure to post here & elsewhere when I upload them!
!
!                      - Bruce Erickson
!                      [e-mail]

! From: Cole Erskine <[e-mail]> [paraphrased]

--- 632,636 ----

! From: Cole Erskine <[e-mail]>

! [paraphrased]

***************
*** 681,682 ****
--- 694,696 ----
        07     End repeat      0                   (NONE)
+       08     Extended        4                   ***

***************
*** 688,690 ****
--- 702,712 ----

+     ***Extended Info Format:
+        ---------------------
+        00-01  Time Constant: Mono: 65536 - (256000000/sample_rate)
+                              Stereo: 65536 - (25600000/(2*sample_rate))
+        02     Pack
+        03     Mode: 0 = mono
+                     1 = stereo

+
    Marker#           -- Driver keeps the most recent marker in a status byte
***************
*** 771,772 ****
--- 793,813 ----
  Copyright 1959, 1964, 1970, 1982
+
+ A note on the resolution of U-LAW by Frank Klemm <[e-mail]>:
+
+ 8 bit U-LAW has the same lowest  magnitude like 12 bit linear and 12 bit
+ U-LAW like 16 linear.
+
+ Device/Coding    Resolution        Resolution
+         on maximal level    on low level
+  8 bit linear     8             8
+  8 bit ulaw     6            12    (used for digital telephone)
+ 12 bit linear    12            12
+ 12 bit ulaw    10            16    (used in DAT/Longplay)
+ 16 bit linear    16            16
+
+ estimated for some analoge technique:
+ tape recorder (HiFi DIN)
+          8             9      (no Problem today)
+ tape recorder (semiprofessional)
+         10.5            13.5