readme.v2

16kb/s Low Delay CELP 算法

	C version of the G728 (floating point)

To use,
Encoder:
ccelp <input speech file> <output bitstream>

Decoder:
dcelp <input bitstream> <output speech file>

To create,
make all

The speech files should be 2-byte per sample and contain no header.

The bitstreams are written as 2-bytes per 10-bit codeword.

The command 'dcelp' invokes the decoder + postfilter.  The postfilter may
be turned off by changing the variable 'postfiltering_p' in dmain.c from
1 to 0.
The makefile generates a dcelpnpf version which has the postfilter
turned off.

The postfilter relies on the coefficients (a10 and k10) calculated in the 
durbin recursion (adapters.c) but is otherwise contained wholly in
postfil.c.

The encoder produced bitstreams match all the test vectors exactly while
the decoder + postfilter output speech files match to between 40 
and 80 dB SNR with the test vector outputs.

See file tv.out
This was generated with the script runtestv, which can only be run
if the testvectors are available

VERIFICATION

This code was test on SUN and SGI platforms using the gcc and cc compilers.
In the tdata directory there are a few test files.

f17.in	- inputfile
f17.bit - bitstream file
f17.outnpf - output file (no postfiltering)
f17.outpf - postfiltered outputfile

If you get sampled data files that are not identical, try to run an
snr measure on it, and see if you are close. Any SNR > 40 dB would make
it very likely that what you have is fine.