Sign in
Search speechcoding
Subscribe to speechcoding
speechcoding by Keywords
ACELP | ADPCM | AMBE | AMR | AMR-NB | CELP | Codebook | DTMF | G.723 | G.726 | G.729 | GSM | Interpolation | LPC | LSF | LSP | MELP | PCM | Perceptual | Pitch | PSOL | QCELP | Quantization | SMV | VAD | Vocoder
Discussion Groups
See Also
Discussion Groups | Speech Coding
Technical discussions related to Speech Coding (all itu and other vocoders, ACELP, CELP, AMR, etc)
Search Results for "pcm"
How to mix AMR files ? [2 Articles]
horiaciu - Jun 27 2007
Hello,
I am implementing a simple mixing program (i.e. create a new sound
file combinig two initial files - all the same format). I have
implemented this for WAV files (PCM)... 
Reg G726 test vector verification
Aditi Akula - Dec 9 2009
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 NR... Input for G729 and G723 from U/A law PCM code. [5 Articles]
zhang_zhh - Jun 27 2003
Hi all,
I have a simple question: according to the G729/G723 spec, the
input buffer should be 16bit linear PCM code, but the decode of U/A
law PCM is 14/13 bit... Samples in 16 bit PCM [3 Articles]
bine...@gmail.com - Jul 4 2006
Hai,
I am a new member of this group.I am a 6th sem MCA student.Now I am trying to implement G729 codec.Till now i didn't get a clearcut idea about 16 bit linear PCM file format.W... Query: 13 bit PCM ? [2 Articles]
jay_coep - Dec 14 2004
Hello,
Can anybody please help explaining why GSM speech codecs (atleast
HR,AMR) prefer 13 bit uniform PCM encoding ? I mean what is so special
about '13... Re: 8 bits samples G.729
Jeff Brower - Mar 20 2003
T-
Is your 8-bit data PCM or A-Law?
If PCM, shift to ms byte, watch out for sign bit (may have to subtract 128).
If A-Law, convert to 16-bit PCM first. ... [ TONE Generation ] PCM - ADPCM
Dhiraviam Natarajan - Sep 13 2003
Hi ppl,
I working on tone generation for an Access Network ( of a telephone exchange ).
Can some one throw light on PCM to ADPCM conversion algorithm , point ... itu g.726a test vectors
Armen Baloyan - Feb 20 2004
Hi all, i'm implementing ITU g.726a speech codec. I need some test vectors
to check my results. i've found test vectors for g.726 but i can't find no
test vectors f... How to mix pcm sample? [6 Articles]
galip0986 - Dec 1 2008
Hello,
I am implementing a voice conferencing program. I am using
tms320vc5416 dsp.I have a distortion problem. I have A-law expanded(13
bit) pcm samples. These samples are ... VAD on AMR frames
nir....@gmail.com - Jul 20 2009
hi all,
I am implementing Voip App on nokia devices.
I have API to AMR Decoding.
I want to implement my own VAD. the reason is that it seems that the AMR VAD doesn't give good... ITU G726 code not working for speech files [4 Articles]
Aditi Akula - Dec 14 2009
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 ... Re: G729 Raw Format
TORKHANI Wajdi - Mar 18 2008
Thank you so much
After 4 weeks I can finally to hear the voice,
But now I have another problem!
If i record only one direction the sound run very quickly and if record both ... G729A CODEC application. [2 Articles]
raghu kisore - Dec 21 2001
hi,
Description of the problem:
-----------------------
i have got the ITU standatrd G.729A CODEC application
written in c.along with the code i have got a t... iLBC on Android [2 Articles]
earl...@gmail.com - Aug 14 2009
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... Regarding float to fixed point conversion [4 Articles]
anu prabhu - Feb 13 2006
Hello !!
I am working on float to fixed point conversion of a Speech Codec.
The input to the speech codec (floating one) is 16 bit PCM.
Fixed point rep... Number of ADPCM channels in E1 ??
saha...@yahoo.com - Aug 25 2005
Hi fellow
Im new comer . could anyone please help me out .
1 . how many channels are transmitted if we have compressed the voice channels in E1 with ADPCM with 40kbps, 32... File Size [2 Articles]
than...@askcalea.net - Jul 24 2007
I got the G 729 ITU-T C code compiled and running. I'm confused about two issues though.
1) Why is the file size of the encoder output the same/or about same as the input. (I u... I/O File Size In G729 [5 Articles]
bine...@gmail.com - Jul 11 2006
Hi,
Now I am working with ITU-T's G729 recommendation.The size of the input I given to this coder was 586 KB(16 bit PCM mono)and I got the output as 600 KB. Is this output's ... linear to mu conv??
simha j - Jun 20 2002
hi all,
I was going through the c-codes for linear pcm to
u-law conversion,
available on the web.
one of the sources use lookup tabel method and another ... G.729 Codec question
³¯«a¥ô - Jan 12 2005
Hello Everybody,
I prepare a pcm file that format is 16bit 8khz mono, the
file size is 49200 bytes. After encode to G.729 format
file, the size is 48000 bytes.... G.729a Tone Detection
James - Oct 16 2002
I'm trying to detect answering machine tones.... so I don't care
about the pitch... just that the pitch remains near constant for some
duration.
Are there a... Re: Compression In G.729 [3 Articles]
Jeff Brower - Aug 18 2006
Bineesh-
> Now I am working with ITU-T's G.729 recommentation. I have one
> doubt.As you know In G.729 Codec the compression rate is 1/8. But
> here in 10 ms, 80 word... Re: Sample g.723.1 ".wav" file
Shaofeng Li - Jul 2 2003
Dear Jameel,
Thank you for the wave file. The sample you sent to me
was in Microsoft PCM uncompressed format. What i'm
looking for really is a wave file in com... [ PCM -ADPCM conversion & vice versa ]
Dhiraviam Natarajan - Oct 9 2003
Hi All,
I'm abt to implement ADPCM decoding/encoding in ADSP 2191.With a minimum
background in Communication Systems, I find it difficult to understand the ADPCM... how to find the no of samples for a GSM file format, to put in the fact chunk ??
ashwinimanjunath - Jan 17 2006
hey,
can anyone give some information on how to find the no of samples for
a GSM file format.in case of GSM610 (or any other compression format
other than PCM) an addition... G726 codec support with .wav files
Aditi Akula - Feb 3 2010
Hi All,
I want to play G726 (16 kbps) encoded data with Windows Media Player (WMP).
I have modified the normal wave header to allow for the G726 code (0x0045).
But it does not... .wav input to g.723
learningdsp - May 27 2004
Hello,
I am a beginner and trying to understand the working of G.723 ADPCM.
I have been able to get all the C files from ITU for the G.723 ADPCM.
I have a b... regarding speech.in file in G.729 [3 Articles]
gupta ksrc - Nov 7 2002
hi everybody i have small doubt regarding g.729 implementation ...
while i am trying to simulate the code given by ITU with speech.in file(which is
given in g729... RE: G726 testing
"Kumar, Sanjeev" - Jul 27 2006
Do the following:
for the input samples/data to the encoder.
for(i=0;i > 2));
and after decoding i.e. at the decoder data which I assume goes in out_buf:
for(i=0;i ... help with G.711 code [2 Articles]
samad_ma - Nov 19 2002
Hi All,
I am testing out the G.711 code given below with a wav file but the
wave file given out by the program is the same size and also it does
not play as well.... Re: g.726 test vectors problem [2 Articles]
Satheesh Ram - Dec 9 2005
Hey,
1 - the reference test vectors given along with G726 also in hex
format, Did you convert all your reference test vectors to binaries?
2- load, lolo, adlo are th... Re: g.723.1
Encai Liu - Sep 7 2001
Hello
> Hello all,
>
> I am using ITU-T G.723.1 C reference code.
> when I execute the c code it asks for input-output
> file name. Here, the input files(T... MOS Score - G.726 ADPCM & G.729 CS-ACELP - Voice Quality issues?
raju...@ngc.com - Jan 22 2009
Hi DSP Related members,
I am researching to find out information on the voice quality of codecs used for VoIP communication using networking routers, switches and access devices... Speech compression in dictation machines
- Nov 20 2001
Dear All,
I am looking for information on the compression done in portable
dictation machines, such as the Olympus DS-3000.
The files have an extension (... Re: Speech data file
- Mar 28 2003
It's a 16 bit PCM (linear) file. Here's a reference:
http://www.apl.jhu.edu/Classes/Notes/Campbell/Joe/playspd.txt
You can play it in CoolEdit by opening it ... Re: About input file format [2 Articles]
Hitesh Thakker - Jun 5 2003
Hi Madan,
These input speech files contain 16 bit linear PCM signals or raw uncompressed digital speech sampled at 8000 samples/sec.... RE: C- code for G.723.1 and LSP coefficients, gain, ...
Sameer Kibey - Nov 24 2003
hi Giovy
It is not necessary to compare the .TCO files with the .RCO files. They are
essentially the same files. This makes sense since .RCO file is the output ... A-law to linear coding & vice-versa [2 Articles]
- May 12 2000
Dear Friends,
Thank you for your prompt response. In the meantime, I
have come across a free source code from Sun Microsystems. But I have
trouble understanding i... Re: Wave header format for mu-law and A-law [5 Articles]
Jeff Brower - Aug 30 2003
Shaofeng-
> The 'fact' chunk is required for all compressed audio
> formats, and for the case where the data is included
> in 'wavl' list chunk.
What kind... Re: How to adjust timing of speech frame [3 Articles]
Don Gabriel - Jul 17 2009
Hi Jeff,
Thank you for explaining. The AMBE+2 data I was examining is really unusual
-- never seen it before like this. It's from an iDEN network. It contained
180 samples (...