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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

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Discussion Groups | Speech Coding

Technical discussions related to Speech Coding (all itu and other vocoders, ACELP, CELP, AMR, etc)

Search Results for "vocoder"

  

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Low Bit Rate (Less than 2.4 kbps) Vocoder

shahram heidari - Jul 13 2006
Dear friends I am looking for fixed point C source code of a vocoder in 1200, 800 or 600 bps. is there any one to help me? BR, Shahram ... Low Bit Rate (Less than 2.4 kbps) Vocoder

PLC for g723.1 vocoder

Lijun Tan - Feb 21 2003
All, Does anybody know where I can find the ITU specification that specifies the Packet Loss Concealment Algorithms for the G723.1 vocoder? Thank you in adv... PLC for g723.1 vocoder

Vocoder 1200 bps

mach...@gmx.net - Sep 2 2005
Could any one help me where i could find more information and sources on 1200 bps vocoder. Regards james kan ... Vocoder 1200 bps

cepstrum vocoder

jefcg - Sep 18 2005
Does anyone know of a vocoder "standard" that implements the cepstrum, or mlsa (mel log spectral approx). If a standard exist, should it use the cepstrum for complete so... cepstrum vocoder

implementation FR GSM vocoder with MATLAB

redundancy2000 - Nov 9 2002
Hi friends, I'm implementing the FR GSM vocoder with MATLAB software. However, i'm not able to correctly decode what has been coded via encoder. Please let me ... implementation FR GSM vocoder with MATLAB

Selectable Mode Vocoder - (SMV) implementation

biswasbiswajit - Feb 28 2002
Hi, We have started working on SMV codec of 3GPP2. Can anyone please guide where can we get the reference source code for SMV (Selectable Mode Vocoder) implementa... Selectable Mode Vocoder - (SMV) implementation

AMR light energy estimation   [2 Articles]

nir....@gmail.com - Jul 23 2008
I am implementing a Jitter buffer for VOIP application. We use AMR as speech vocoder. I need to throw away some packets. I would like to throw packetes that have low energy co... AMR light energy estimation

Test Vectors for MELP Vocoder...   [2 Articles]

Khubaib - Mar 18 2005
Dear members! I need different test vectors (preferably standard test vectors) for testing MELP 2400bps voice coding standard. I am in the process of impl... Test Vectors for MELP Vocoder...

MBE

- Jun 20 2002
Hello, I am looking for information about phase distribution in my vocoder (Matlab model of some kind of MBE vocoder, but some parameters are detected by Analyse-... MBE

Re: PLC for g723.1 vocoder

bada...@yahoo.com - Jul 27 2005
You can go for ITU-T G.723.1 (11/96), and Annexxe A from 3gpp.org Thanks ... Re: PLC for g723.1 vocoder

Re: looking for a evrc decoder and encoder

- Dec 6 1999
I got one in : ftp://ftp.qualcomm.com/pub/vocoder/EVRC/ It might be useful for you. Mohamad Alifikri On Mon, Dec 06, 1999 at 07:13:1... Re: looking for a evrc decoder and encoder

LSF in g.723.1   [2 Articles]

milamine - Sep 4 2003
hi all i'm working on quantizing the LSF can i use the LSF generated by the VOCODER g.723.1? and if so how can i get them. Thx a lot. ... LSF in g.723.1

test sequences for MELP

Eli Britstein - Jun 30 2003
Hi all, Is there a standard of test sequences for the MELP vocoder ? If so, where could I find them ? Thanks, Eli. ... test sequences for MELP

SMV vocoder source code ?

biswasbiswajit - Mar 4 2002
Hi, I could not find the source code in the 3gpp2.org site? Is there any other location we can find it? Any help on this will be very useful. regards ... SMV vocoder source code ?

QCELP source code   [2 Articles]

chifa98 - Aug 15 2003
Does anyone know where I can get the source code for QCELP vocoder ? ... QCELP source code

LSP in g.723.1 floating point

milamine - Aug 24 2003
hi all i'm working on PLC with th g.723.1 vocoder when checking out the LSP frequencies i came up with some strange frquencies knowing that 0 <= LSP <= pi !!! ... LSP in g.723.1 floating point

speech classification from LSF parameters

ee41gi - Aug 1 2007
How can i do classification of speech from the LSF parameteres given from a split-band vocoder? I need to classify the speech into voiced unvoiced and mixed excitation.I did a ... speech classification from LSF parameters

Need source code of QCELP   [5 Articles]

- Oct 12 1999
Hi all, I am intend to learn much about variable rate speech coding, and I take QCELP (Qualcomm CELP) to study.I am looking for any good reference that have... Need source code of QCELP

Test vectors for MELP and G.723 vocoders

Khubaib - Nov 30 2004
Dear all ! I want to have any standard or GOOD test vectors for voice coders like MELP and G.723.1. Where can i find them.?. Is there a way for noise analys... Test vectors for MELP and G.723 vocoders

Re: Digest Number 250

- Mar 12 2003
Hi, I don't think any optimised version of G.723.1 is available. In G.723.1 vocoder, There are search algorithms which involves 5 levels of nested Loops becau... Re: Digest Number 250

re: LPC filter order

Bill Wiese - Jan 19 2006
Satheesh.. > [Satheesh Ram Subject: LPC filter order > > Hi all, > In vocoders, why linear prediction filter is always > designed as 10... re: LPC filter order

Question on G.728 Codec   [4 Articles]

Rao - Sep 21 2000
Hi all, I have few questions on Low Delay speech coders. As we all know that G.728 is a Low delay speech coder and is very complex interms of computations. ... Question on G.728 Codec

[RE] Selectable Mode Vocoder - (SMV) implementation   [2 Articles]

¹Ú¿µÈ£ - Feb 28 2002
Hi! Go to "3gpp2.org" site. It exsited floating, Fixed source code and test vector in the site. Good lucky!! ---------> ¹ÞÀº ¸ÞÀÏ ³»¿ë <---------- ... [RE] Selectable Mode Vocoder - (SMV) implementation

Re: Gaussian Mixture Coding Algorithm

- Oct 14 1999
Check the following references for using Mixtures of Gaussians in speech coding: (email: or ) 1) P. Zolfaghari, and A. J. Robinson, " Formant analysis using mxi... Re: Gaussian Mixture Coding Algorithm

Re: Digest Number 144

Pratul Chakre - Mar 2 2002
hi michael, I am a student currently working on the G.729 standard of ITU-T for speech compression. In that, it uses LPC 10 and converts the incoming input fil... Re: Digest Number 144

Re: what's the difference ?

Khaled El-Maleh - Oct 22 1999
IS95 represents the CDMA standard (including the speech coding specifications) and IS96A is the speech coding standard for the IS95 (known as QCELP). Refere... Re: what's the difference ?

Re: statistical characteristics ACELP

nacer_ghoul - Mar 5 2008
Hi Mehdi, First of all, you should reply/comment to the messages through the Group's forum, to let every one share the information, and also to get different views/advices from ... Re: statistical characteristics ACELP

Re: questions about G.723.1 and G.729   [2 Articles]

- Jan 17 2003
Hi all As we know in the channel vocoder each segment of input speech is analyzed using a bank of band pass filters called the analysis filters The energy at t... Re: questions about G.723.1 and G.729

Re: Identify low energy AMR frames

Yueheng Sun - Sep 3 2008
That is VAD detection, you need to check from vocoder if there is voice act= ivity. For wireless application in DTX mode, there are some extra code set = like SID_UPDATE/SID_ONSE... Re: Identify low energy AMR frames

Re: Input for G729 and G723 from U/A law PCM code.   [4 Articles]

Zhang Zhenghao - Jun 27 2003
Thank you! You are right on the bandwidth caculation. I am just wonderring how to handle the 16 input requirement for G723/G729 codec when I only have A/U PC... Re: Input for G729 and G723 from U/A law PCM code.