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1991-11-01
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NOHISS: Digital Noise Reduction
Version 1.0
────────────────────────────────
(C) Copyright 1991 by Andy Hakim
All Rights Reserved
R E F E R E N C E M A N U A L
For a quick summary of options, type NOHISS at the dos prompt.
NOHISS version 1.0 Reference Manual
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TABLE OF CONTENTS
ADDRESSES ............................................................. 1
SOFTWARE LICENSE ...................................................... 1
ABOUT NOHISS .......................................................... 2
FILE FORMATS .......................................................... 3
COMMAND LINE SYNTAX ................................................... 3
COMMAND LINE OPTIONS .................................................. 4
/? ................................................................ 4
/HELP ............................................................. 4
/NR=# ............................................................. 4
/SIZE=# ........................................................... 4
/RANGE=# .......................................................... 5
/MIN=# ............................................................ 5
/MAX=# ............................................................ 5
/[NO]FANCY ........................................................ 5
/[NO]OVER ......................................................... 5
/[NO]PROCESS ...................................................... 5
/[NO]PAUSE ........................................................ 6
/[NO]PLAY[I][O] ................................................... 6
/TIME=# ........................................................... 6
/PORT=# ........................................................... 6
/SAVE ............................................................. 6
/RESET ............................................................ 6
> NUL ............................................................. 6
COMMAND LINE EXAMPLES ................................................. 7
ERROR MESSAGES ........................................................ 8
SOURCE CODE ........................................................... 9
TRADEMARKS ............................................................ 9
REVISION HISTORY ...................................................... 9
NOHISS version 1.0 Reference Manual Page: 1
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ADDRESSES
───────────────────────────────────────────────────────────────────────────
Comments, suggestions, or questions? You can contact me via:
US Mail │ Software Development
│ P.O. Box 70392
│ Houston, TX 77270-0392
│
Telephone │ (713) 880-3059
│
Electronic Mail │ st144@menudo.uh.edu
(Internet addresses) │ cosc12r2@jetson.uh.edu
│
Bulletin Board │ Sand's BBS
│ (713) 961-1604
│ 2400/9600/14400 baud, HST/v.32
│ Username: Andy Hakim
Thanks to Gene "Music Man" Pope for many helpful suggestions and testing.
Gene is an expert on digital sampling, and sound processing in general.
His address is cosc12ui@jetson.uh.edu on internet.
Another address I would like to mention is that of Aaron Wallace. He
originated the SND file format which is widely used by many programs.
His address is aaron@jessica.stanford.edu on internet.
SOFTWARE LICENSE
───────────────────────────────────────────────────────────────────────────
NOHISS version 1.0 is a FREE, public domain program. There is no
registration process or monetary fee required to use it.
You may freely distribute NOHISS to others as long as:
■ Only the original files are distributed
■ No changes are made to any files
■ No money is charged for the program
NOHISS and this documentation are (C) Copyright 1991 by Andy Hakim.
All Rights Reserved. The author of this program is not liable for any
damage caused by its use. By using this program, you agree to the
above conditions.
NOHISS version 1.0 Reference Manual Page: 2
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ABOUT NOHISS
───────────────────────────────────────────────────────────────────────────
Nohiss reduces or removes background "noise" that is almost always present
when a recording is made on a Soundblaster card. Background noise is most
apparent when using a microphone, but is also present to some degree if you
use a direct input connection.
Graphically, "hisssssss" looks like this:
+128┌───────────────────────────────────────────────────────────────┐
A │ . Speech │
m │ . . . │
p │ . . . . │
l │ . . . . . . . . . . . Silence (nohiss) │
i 0│. . . . . . . . . . . . .......................│
t │ . . . . . │
u │ Hisssssssss . . . │
d │ . Speech │
e │ │
-128└───────────────────────────────────────────────────────────────┘
Time --->
NOHISS was designed to work on speech recordings. If you run NOHISS on
a digitized music (ie: rock and roll song) file, there will probably
be no improvement in quality. There is no fixed level of reduction
that works for all speech samples but by adjusting the command line
parameters you will generally end up with a better sounding sample.
One of the (good) side effects of NOHISS is that the output file will
probably compress (using a file compression program) tighter than the
original. Run DEMO.BAT to hear a sample of the before and after
versions of a speech sample.
Certainly, removing hiss from sound files is probably not going to appeal
to everyone... but there might be certain multimedia and presentation
applications where this could prove useful. This project started out
merely as an experiment, but after doing some tests I heard some dramatic
improvements in speech samples.
If you find nohiss useful, I would appreciate some feedback. This
will encourage me to continue supporting and enhancing this utility.
NOHISS version 1.0 Reference Manual Page: 3
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FILE FORMATS
───────────────────────────────────────────────────────────────────────────
NOHISS supports the following digitized file formats:
.VOC - Soundblaster 8-bit VOICE format. Currently, only the unpacked
format is supported. Normally when you record a sound, it is
stored in an unpacked state. The Soundblaster/PRO Stereo sound
format it not supported at this time. If the VOC file contains
special blocks such as markers, text information, they will
automatically be copied without change.
.SND - This is raw 8-bit data with header information. There are two
basic types of SND files. Nohiss recognizes both versions and
retains p