## Forums Search for: Quantization

## Quantization of LSP /G.729

inhi 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...

## centroid calculation for weighted Euclidian distance

Dear all, I would like to train a dictionary for vector quantization of LSFs for speech coding. At every iteration, the...

Dear all, I would like to train a dictionary for vector quantization of LSFs for speech coding. At every iteration, the new centroid is calculated as the arithmetic mean of all the vectors allocated to one cell, if we use Eucledian distance as distortion measure.

## channel optimized matrix quantization

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

## about wavelet decompostion of CWs?

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!

## speech classification from LSF parameters

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.

## Spectral Distortion in Lattice Filters

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

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...

## waveform interpolation coder with accurate reconstruction

inHi 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