channel optimized matrix quantization

Started by gomzzk in Speech Coding17 years ago

Hai, I want to know how a channel optimized matrix quantized codebook be designed? Is there any C source code availble on net? ...

Hai, I want to know how a channel optimized matrix quantized codebook be designed? Is there any C source code availble on net? If not ,how should it be designed? Anyone with idea please reply as early as possible. Thanxs, Gomathi


mean of the innovation energy in GSM-EFR

Started by Anonymous in Speech Coding20 years ago 1 reply

Dear all, In GSM-EFR, the mean of the innovation energy is needed for the quantization of the fixed codebook gain. The...

Dear all, In GSM-EFR, the mean of the innovation energy is needed for the quantization of the fixed codebook gain. The standard mentions that this energy is 36 dB. Could somebody tell me how this value was computed ? Thanks in advance, Giusy


Spectral Distortion in Lattice Filters

Started by #ARIJIT BISWAS# in Speech Coding14 years ago

Dear Members of the list: My question is related to quantization of Linear Prediction (LP) Parameters. I know very well...

Dear Members of the list: My question is related to quantization of Linear Prediction (LP) Parameters. I know very well that LP parameters are mapped onto Reflection Coefficients and we get a lattice filter. Now, lets say I have an order K Lattice filter: implying that I've a concatenation of first-order lattice


problem with vq

Started by poonam bansal in Speech Coding13 years ago

I am working on speech recognition using vector quantization. I am able to generate codebooks for different words separately by using vq (LBG)....

I am working on speech recognition using vector quantization. I am able to generate codebooks for different words separately by using vq (LBG). But i don't know how to combine the codebooks of same words spoken by different speakers. Because that is very much required if i want to recognize a particular word spoken by different speakers. I want to create one single codebook for one word (spoken...


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...


about wavelet decompostion of CWs?

Started by wang...@163.com in Speech Coding13 years ago

Dear all, I want to use wavelet analysis to decompose and reconstruct CWs based on biorthogonal FIR linear phase filter banks , but I have...

Dear all, I want to use wavelet analysis to decompose and reconstruct CWs based on biorthogonal FIR linear phase filter banks , but I have found that the time delay of 3-level wavelet decomposition of CWs is very high (about 6 speech frames). Can you tell me how to solve the delay problem? Does the wavelet method benefit to quantization and bits compression? Thank you!


waveform interpolation coder with accurate reconstruction

Started by empush2000 in Speech Coding16 years ago 1 reply

Hi everyone, I am currently working on waveform interpolative speech coding. I exploit the usual scheme, but it doesn't provide...

Hi everyone, I am currently working on waveform interpolative speech coding. I exploit the usual scheme, but it doesn't provide accurate (perfect) waveform reconstruction even when using no quantization. Does anyone know any papers/info about perfect reconstruction for waveform


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.