Low Bit Rate (Less than 2.4 kbps) Vocoder

Started by shahram heidari in Speech Coding13 years ago

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

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


PLC for g723.1 vocoder

Started by Lijun Tan in Speech Coding17 years ago

All, Does anybody know where I can find the ITU specification that specifies the Packet Loss Concealment Algorithms for the...

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 advance! Daniel Tan


Vocoder 1200 bps

Started by mach...@gmx.net in Speech Coding14 years ago

Could any one help me where i could find more information and sources on 1200 bps vocoder. Regards james kan

Could any one help me where i could find more information and sources on 1200 bps vocoder. Regards james kan


MBE

Started by Anonymous in Speech Coding17 years ago 1 reply

Hello, I am looking for information about phase distribution in my vocoder (Matlab model of some kind of MBE vocoder, but some...

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-by-Synthese ). I have pitch frequency, amplitudes of each harmonics (spectral envelope), and phases. So I can


implementation FR GSM vocoder with MATLAB

Started by redundancy2000 in Speech Coding17 years ago

Hi friends, I'm implementing the FR GSM vocoder with MATLAB software. However, i'm not able to correctly decode what has been...

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 know if anybody has implemented GSM 06.10 with MATLAB. Regards Javad


cepstrum vocoder

Started by jefcg in Speech Coding14 years ago

Does anyone know of a vocoder "standard" that implements the cepstrum, or mlsa (mel log spectral approx). If a standard exist, should...

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 source filter model or just pitch detection?? Any suggestions would be much appreciated. Thanks, JC


Selectable Mode Vocoder - (SMV) implementation

Started by biswasbiswajit in Speech Coding18 years ago

Hi, We have started working on SMV codec of 3GPP2. Can anyone please guide where can we get the reference source code for SMV...

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) implementation? regards Bis ________________________________________ Biswajit Biswas ________________


AMR light energy estimation

Started by nir....@gmail.com in Speech Coding11 years ago 1 reply

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...

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 content. the vocoder code is not mine so I can't do the full decoding to find out the result enegry of the frame. Is there a gain decoded in the amr packet that I can get quick estimation of the frame energy? I lo...


[RE] Selectable Mode Vocoder - (SMV) implementation

Started by in Speech Coding18 years ago 1 reply

Hi! Go to "3gpp2.org" site. It exsited floating, Fixed source code and test vector in the site. Good lucky!! ...

Hi! Go to "3gpp2.org" site. It exsited floating, Fixed source code and test vector in the site. Good lucky!! ---------> ??? ??? ???? <---------- > Title : [speechcoding] Selectable Mode Vocoder - (SMV) implementation > Date :


Test Vectors for MELP Vocoder...

Started by Khubaib in Speech Coding15 years ago 1 reply

Dear members! I need different test vectors (preferably standard test vectors) for testing MELP 2400bps voice coding...

Dear members! I need different test vectors (preferably standard test vectors) for testing MELP 2400bps voice coding standard. I am in the process of implementing MELP 2400 vocoder on different platforms and i need test vectors to test for thier validity. Are


How to adjust timing of speech frame

Started by dbga...@gmail.com in Speech Coding10 years ago 6 replies

Hi, Anyone here know a method to adjust timing of 22.5ms speech frames to 20ms. I am working with different vocoders including AMBE (Advanced...

Hi, Anyone here know a method to adjust timing of 22.5ms speech frames to 20ms. I am working with different vocoders including AMBE (Advanced Multiband Excitation) versus CELP/VSELP. The generated vocoder frames are originally 22.5ms, but the vocoder DSP chip takes in 20ms. Basically, are there techniques that exist such as time compression, post-filtering/processing, duplicating speech fra...


Re: PLC for g723.1 vocoder

Started by bada...@yahoo.com in Speech Coding14 years ago

You can go for ITU-T G.723.1 (11/96), and Annexxe A from 3gpp.org Thanks

You can go for ITU-T G.723.1 (11/96), and Annexxe A from 3gpp.org Thanks


LSP in g.723.1 floating point

Started by milamine in Speech Coding16 years ago

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 ...

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 !!! (i.e 4,.. 10,.. 80,... . . . . 210,.. 233.,


LSF in g.723.1

Started by milamine in Speech Coding16 years ago 1 reply

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....

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.


Re: Digest Number 250

Started by Anonymous in Speech Coding17 years ago

Hi, I don't think any optimised version of G.723.1 is available. In G.723.1 vocoder, There are search algorithms which...

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 because of which most of the cross compilers with highest level of optimisation enabled would produce inefficie


test sequences for MELP

Started by Eli Britstein in Speech Coding16 years ago

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

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


SMV vocoder source code ?

Started by biswasbiswajit in Speech Coding18 years ago

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...

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 Biswas


QCELP source code

Started by chifa98 in Speech Coding16 years ago 1 reply

Does anyone know where I can get the source code for QCELP vocoder ?

Does anyone know where I can get the source code for QCELP vocoder ?


Need source code of QCELP

Started by Anonymous in Speech Coding20 years ago 4 replies

Hi all, I am intend to learn much about variable rate speech coding, and I take QCELP (Qualcomm CELP) to study.I am looking...

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 complete describe about the concept and algorithm of this vocoder. Especially I need the source code


speech classification from LSF parameters

Started by ee41gi in Speech Coding12 years ago

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...

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 small research and i found that vector quantization is a good method for the classification of speech from the LSF parameters but i dont know how to implemend this in C programming.