About Mean-removed LSF vector and quantization of LSF coefficient in CELP coding

Started by cherrymata in Speech Coding16 years ago

Dear All, I have some difficulties in understanding CELP coding process, one of them is about Mean-removed LSF vector and...

Dear All, I have some difficulties in understanding CELP coding process, one of them is about Mean-removed LSF vector and quantization of LSF coefficient (ETSI 06.09). For 7.95 kbps mode, the residual LSF is quantified using split vector quantization (SVQ). The re


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.


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.


LSF quantizer

Started by #ARIJIT BISWAS# in Speech Coding12 years ago 1 reply

Hi all! Does anyone know what=C2=92s the latest & greatest LSF quantizer available = for wideband speech coding? :-) For example, what=C2=92s...

Hi all! Does anyone know what=C2=92s the latest & greatest LSF quantizer available = for wideband speech coding? :-) For example, what=C2=92s the minimum number bits/frame required for quantiz= ing a 16-th order LPC operating at 16-kHz sampling?=20 If anyone is aware of any nice references please let me know. Best Regards, Arijit =20


Bandwidth Extension

Started by seid...@yahoo.com in Speech Coding8 years ago

Dear Sir/Mrs My research field is speech enhancement and want to know about bandwidth extension more. If any one have comprehensive...

Dear Sir/Mrs My research field is speech enhancement and want to know about bandwidth extension more. If any one have comprehensive information about these methods please help me to solve my problem about codebook method. I can not convert my LSF's coefficients for narrow band speech to wideband speech LSF's. Regards. Seyed Farid Mousavipour


About MSVQ design codebook

Started by mouloud Djamah in Speech Coding11 years ago

Hi =20 I have questions and I hope that someone will reply me.=20 - I Know that for SVQ (Split vector quantization) design codebook for LSF...

Hi =20 I have questions and I hope that someone will reply me.=20 - I Know that for SVQ (Split vector quantization) design codebook for LSF = (line spectral frequencies) quantization, the centroid of each cell is calc= ulated as the mean of all vectors (belong to this cell) even if the weighte= d Euclidean distance is used while designing the codebook. This is to ensur= e that the LSF para...


LPC to LSF Source Code

Started by ray....@gmail.com in Speech Coding11 years ago 2 replies

Hello; I was wondering if anyone would be willing to share or direct me towards some Java or C code on how to convert from Linear Prediction...

Hello; I was wondering if anyone would be willing to share or direct me towards some Java or C code on how to convert from Linear Prediction Coefficients to Line Spectral Frequencies and vice versa. I am able to generate the LP coefficients using the Levinson algorithm, but am looking for some help to get to LS frequencies. Thanks. Regards, Ray


Moving average Prediction Filter - G.729

Started by pchakre in Speech Coding18 years ago

Hello, In the Section 3.2.4 - Quantization of the LSP coefficients (Pg. 12) in ITU-T Recommendation G.729 documentation, we have...

Hello, In the Section 3.2.4 - Quantization of the LSP coefficients (Pg. 12) in ITU-T Recommendation G.729 documentation, we have to use two switched 4th order MA prediction filters to predict tha LSF coefficients. Can anyone please help me out as to which type of MA predictors


line spectral frequencies

Started by auliasn in Speech Coding17 years ago

dear all i have some difficulties with some algorithms. could anyone explain to me about the LPC and LSF (line spectral ...

dear all i have some difficulties with some algorithms. could anyone explain to me about the LPC and LSF (line spectral frequencies) algorithms that are being used in AMR system? coz i've found out in the ETSI doc or 3GPP doc. not clear enough for me to understand it.


Quantization of LSP /G.729

Started by wnit...@yahoo.com in Speech Coding13 years ago 2 replies

hi all, G.729 recommendation states:-to predict the values of LSF a 4th oreder MA is used.Two predictions are possible .the encoder...

hi all, G.729 recommendation states:-to predict the values of LSF a 4th oreder MA is used.Two predictions are possible .the encoder chooses which one to use and indices it with a bit in the bit stream. after prediction ,prediction error is computed .this error is sent to decoder by vector quantizing it. my que is what are these two possible predictions ? what is MA prediction? can any...


MPEG-2 layer-3 multichannel decoder

Started by pai_raviin in Speech Coding14 years ago 2 replies

Hi, I am trying to implement the MPEG-2 layer-3 multichannel decoder, backward compatible with MPEG-1 layer-3. I am new to this work...

Hi, I am trying to implement the MPEG-2 layer-3 multichannel decoder, backward compatible with MPEG-1 layer-3. I am new to this work and I don't have any source code to implement this decoder, but I got spec 13818-3. Actually I am trying to build this multichannel decoder around the MPEG- 1 layer-3 and its low sampling frequency (lsf) stereo decod