************************************************************************
     Steve Krenek's Compressed Digital Audio
	featuring 4:1 compression
     Copyright (c) 1993 Steve Krenek
************************************************************************

LICENSE AGREEMENT:
	This a shareware product and may be freely distributed as long as
  the following conditions are followed:
	* the program is not modified in any way,
	* all files herein are distributed together,
	* only a nominal amount is charged for providing copies.
  If you use this program, please become a registered user.
  Use the accompanying order.txt, or send $15 (+$3 shipping & handling) to:

      Steve Krenek
      10803 Kinghurst, Suite 255
      Houston, TX 77099


This program is available as a library for incorporation into your
own program.  The current version supports Microsoft C.  The source
code is also available for those wish to make additional modifications.
	Library       $49
	 with Source  $99

***************************************************************************
USAGE:

  Compression: comp file.voc file.cda

  Decompression: decomp file.cda <file.voc>
		     (If no file.voc is given, the .cda file will play.)

***************************************************************************
A Note to users:

   If there are any questions or problems (if you have problems with a
particular file, please include a copy of that file with the desciption
of the problem), please let me know.

   And if there are program enhancements you would like to see
(other sound file formats, support for other compilers, more functions,
documentation improvements), please let me know that too.

   I can be reached by writing to the above address, or on Compuserve
at 70404,573.  (Including your registration number is appreciated and
gets you a higher priority response!).  Thanks for your support.

			Steve Krenek


**************************************************************************
Program Notes

   This program uses ADPCM (Adaptive diffrential Pulse Code Modulation)
to compress uncompressed 8-bit digital data in .VOC format files.  The
raw data is compressed by a factor of 4:1 (each byte is stored in 2-bits).
However, after every 15 bytes a scale factor (the adaptive part), so
overall compression of raw data is 3.75:1.  Also, the .VOC format has some
overhead and may contain some previously compressed data, which is not
further compressed, so typical files are compressed by a factor of
3.5 - 3.7:1.