G.729 ITU-T c-code bitstream

Started by bnay...@gmail.com in Speech Coding9 years ago

While trying to implement g.729 coder on some raw file the output it gives is basically a bitstream file I mean a binary file. The binary file...

While trying to implement g.729 coder on some raw file the output it gives is basically a bitstream file I mean a binary file. The binary file actually contains some binary data stream like "00101010110111100101011001". should I convert to the desired pattern for g.729 by taking the stream from left if I want to achieve the coded format? I am not very sure whether g.729 coded data in the bitstream...


Source Code GSM--FR Codec

Started by Artham Sridhar in Speech Coding9 years ago 4 replies

Hi All I am not able to find GSM-FR speech codec ansi c code. If any body knows where can I get, please reply to me. I have already...

Hi All I am not able to find GSM-FR speech codec ansi c code. If any body knows where can I get, please reply to me. I have already searched in 3gpp standard search. But not able to find. Thanks in Advance. Regards Sridhar Artham


G726 ITU test vector strangeness

Started by Jeff Brower in Speech Coding9 years ago 2 replies

All- Has anyone ever noticed the G726 ITU u-Law input test vector (a file called nrm.m on ITU pages) has what appears to be an inversion or...

All- Has anyone ever noticed the G726 ITU u-Law input test vector (a file called nrm.m on ITU pages) has what appears to be an inversion or wrap-around? Not saying this is a problem, bit-exact testing using the vector works Ok. But it looks odd, and the inversion doesn't occur around 128. Here is a pic that shows an example in the 504 Hz tone section of the test vector: http://www.s...


LPC method

Started by Iman Rasti in Speech Coding9 years ago 1 reply

Dears : Hi Is there any body who can introduce me a simple and understandable document about speech coding ? kindest Regards Iman...

Dears : Hi Is there any body who can introduce me a simple and understandable document about speech coding ? kindest Regards Iman Rasti Email:i...@gmai.com Tel: +98-0912-4701588 Nokia Siemens Networks


ITU G726 code not working for speech files

Started by Aditi Akula in Speech Coding10 years ago 3 replies

Hi Everyone, I am using the G726 code from ITU (g726.c, g726.h, cvt_h_b.c, etc) for 16 kbps an using it as a Visual C++ project. I have tested...

Hi Everyone, I am using the G726 code from ITU (g726.c, g726.h, cvt_h_b.c, etc) for 16 kbps an using it as a Visual C++ project. I have tested the code using the test vectors from ITU and found them to be bit exact (sent in the 16-bit A-law/ Mu-law output from the cvt_h_b.c code). I have also modified the code to accept 16-bit linear PCM data and send out linear PCM data and tested with t...


Reg G726 test vector verification

Started by Aditi Akula in Speech Coding10 years ago

Hi everyone, I am working on G726. I have the source code in C (from Sun Microsystems). I am trying to test the algorithm using the ITU test...

Hi everyone, I am working on G726. I have the source code in C (from Sun Microsystems). I am trying to test the algorithm using the ITU test vectors. I have converted the NRM.M and OVR.M hex files to binary files using the cvt_h_b.c (code from ITU site). My code takes in linear PCM and outputs linear PCM so I have converted the mu-law and a-law binary files into linear PCM files. I...


CVSD Decoder filter

Started by Aditi Akula in Speech Coding10 years ago 2 replies

Hi, I am working on a CVSD code that I found online on Koders.com. I have a few questions. The CVSD code that I am working on is a 16kbps...

Hi, I am working on a CVSD code that I found online on Koders.com. I have a few questions. The CVSD code that I am working on is a 16kbps code. 1) In the decoder side of the code, a 48-tap FIR filter (integrator) is used. The coefficients of this filter are already given in the code. Looking at the frequency response of the filter, it looks like a low pass filter with cut-off at appro...


problem with EVRC-B fixed code

Started by "G. Lakshmi Harika" in Speech Coding10 years ago 5 replies

We have downloaded version 4.4 EVRC-B fixed point code from ftp://ftp.3gpp2.org/TSGC/Incoming/SWG11/evrc_rel-C_mps_software/ While running...

We have downloaded version 4.4 EVRC-B fixed point code from ftp://ftp.3gpp2.org/TSGC/Incoming/SWG11/evrc_rel-C_mps_software/ While running the decoder in DTX (9_3.o22 and 5_8.o22 outputs for 9_3.p22 and 5_8.p22 resp) are not passing. I would highly appreciate if anyone having information on these issues of this code could help me out. -- Thanks and Regards, G.L.Harika It is your a...


Problem with EVRC-B fixed point code

Started by venu...@yahoo.com in Speech Coding10 years ago

We have downloaded version 4.4 EVRC-B fixed point code from ftp://ftp.3gpp2.org/TSGC/Incoming/SWG11/evrc_rel-C_mps_software/ We find two...

We have downloaded version 4.4 EVRC-B fixed point code from ftp://ftp.3gpp2.org/TSGC/Incoming/SWG11/evrc_rel-C_mps_software/ We find two problems with this code. They are: 1. We find that the output of the encoder doesn?t match with the expected output for Operating point-2 and signal power 22 and 32 dB (i.e. we used the command line options -i src.s22 -o 4_8.p22 -X OP=2 ?e and -i src.


iLBC on Android

Started by earl...@gmail.com in Speech Coding10 years ago 1 reply

Hi, I am using the iLBC speech codec on Android. I have not changed the original code I obtained from the RFC. I have just written JNI bridges...

Hi, I am using the iLBC speech codec on Android. I have not changed the original code I obtained from the RFC. I have just written JNI bridges to access the C code. There are no exceptions during encoding and decoding. I am using 8KHz, 16bit, Mono. I am using the 30ms encoding option. Whenever I playback decoded audio, it plays faster than the original rate it was recorded at. I have checked th...


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