Sun Jul  7 15:35:44 CDT 1996
Andy Fingerhut (jaf@arl.wustl.edu)

Before you can make any of the programs in this directory, you must
change to the lpc10 directory and make the LPC-10 library.  See the
README file there, and be especially sure to read the notes there
about possible modifications you will need to make to the file lpc10.h
in this directory.

I've made up a Unix makefile for the programs nuke and unnuke, called
makefile.unx.  I don't know how to create a makefile for Microsoft C.
Feel free to send me one if you create one that works.

The files in this directory are just some simple main programs that
call the routines create_lpc10_encoder_state(), lpc10_encode(),
create_lpc10_decoder_state(), and lpc10_decode().  Those four routines
are defined in source files within the subdirectory lpc10, and are all
that any application ever needs to use to compress and decompress
speech with the LPC-10 coder.  The main programs in this directory are
just intended as examples of how to use these routines.

Optionally, an application could also use the routines
init_lpc10_encoder_state() or init_lpc10_decoder_state() to
reinitialize a state struct that was created by one of the create
functions mentioned above.  This could be useful between talk spurts,
for example, to flush out any possible remaining garbage state that
could occur because some data was lost.  This shouldn't be necessary,
since any old bad state should be flushed out or decay within a few
frame times anyway (frame time = 22.5 ms).  I have heard lost packets
(or maybe they were garbled?) produce interesting audio artifacts in
the application Nautilus.


Tue Aug 20 15:49:04 CDT 1996
Andy Fingerhut (jaf@arl.wustl.edu)

I have just completed making many changes to the C source code that
allow multiple audio streams to be compressed or decompressed in an
interleaved fashion.  This is useful, for example, for some Internet
MBONE audio tools that can receive compressed audio from multiple
sources simultaneously.  See one or more of the following
demonstration programs for examples of the calling sequence:

nuke - compressing one audio stream
nuke2 - compressing two audio streams, alternating one frame from each
unnuke - decompressing one audio stream
unnuke2 - decompressing two audio streams, alternating one frame from each