Technical discussions related to Speech Coding (all itu and other vocoders, ACELP, CELP, AMR, etc)
Search Results for "quantization"
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koro - May 5 2004
I am working on the quantization of LSFs in G.723.1.
I found that sometimes G.723.1 introduces a quite large
percentage of outliers in the range of 2...
madrid_k - Nov 20 2003
im doing my thesis on quantization of speech parameters. i need more
information on multi-stage vector quantization. aside from the paper
cherrymata - Nov 12 2003
I have some difficulties in understanding CELP coding process,
one of them is about Mean-removed LSF vector and quantization of LSF
SARAT CHANDRA - Oct 15 2003
can anyone point to resources (papers etc.) on "Spilt Vector
Quantization" / Algorithms ??
sita rama - Jun 3 2003
can any one suggest me a good material to understand and implement
waiting for u r suggestion....
thanx in advance
mata mata - Jul 7 2003
anyone know about how to make a codebook in Vector Quantization used in CELP
coding ? how to implement Linde, Buzo, Gray (LBG) Algorithm ?
subrata chatterjee - Jun 18 2002
Anybody experienced in AMR speech coding can please
tell something about LSP quantization. Actually i have
tried to understand it from the standard but i ...
mojtaba mahdavi - Sep 14 2003
Hi dear all.
I am doing a project on MELP.
Now I want to undrestand Multi Stage Vector
But I cant find a good text on it.
Does any body...
abhisheksgumadi - May 24 2006
I am working on low bit rate speech coding.
I have efficiently quantized the lpc coefficients using vector
quantization methods. I am looking at an efficient way of quantizi...
fai_abdullah - Jun 15 2004
I am working on Speex and it uses Subvector Shape Only VQ for
innovation quantization. If any body knows the exact algorithm and
any good source (paper/website...
#ARIJIT BISWAS# - Jun 26 2006
I was reading the book, "Speech Coding and Synthesis" by Kleijn & Paliwal.
In page 445, from the table we see that for scalar quantization of the reflection coeffici...
mahesh mudela - Jan 8 2005
I am facing a problem regarding implemenatation of
non uniform quantization.
A parameter wohose range is between
-12 to 6...
Jeff Brower - Sep 30 2002
> I have written a LPC10 encoder which produces the reflection
> cofficients,gain, pitch parameters etc using a 6711. These values are
> in floating ...
Eris Ristemena - Jul 26 1999
can anyone help me how to quantize gain in LPC 10 coding scheme?
gw8912 - Mar 3 2002
Does anyone research this kind of codec?
I can't understand the part of multi-quantization
Can any one have standard or reports of the MELP?
Thank you ...
mouloud Djamah - Jul 28 2008
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) quant...
gomzzk - Nov 20 2002
I want to know how the probability density function(in average
distortion computation) required in determining the optimum codebook
in channel optimized vect...
gomzzk - Nov 18 2002
I want to know how a channel optimized matrix quantized codebook
Is there any C source code availble on net?
If not ,how should it be designed...
- Mar 30 2000
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...
wang...@163.com - Apr 25 2006
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-leve...
- Nov 16 1999
I was checking the references I have on the MELP, and I found two
articles, which I have forgotten about, that maybe useful for your work:
poonam bansal - Feb 19 2007
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 ...
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 ...
shabnamso - Dec 9 2003
I would be thankful if anybody who has tested the G729A source code
by ITU can tell me if the QUA_GAIN function has been implemented
exactly as the
wnit...@yahoo.com - Aug 22 2006
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...
empush2000 - Sep 21 2003
I am currently working on waveform interpolative speech coding. I
exploit the usual scheme, but it doesn't provide accurate (perfect)
pchakre - Jan 24 2002
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 ...
Shree Jaisimha - Apr 23 2004
Does anyone have any sample matlab file for building of a Vector quantization code book of size 256 for speech processing?
If anyone can explain...
Biundo Giuseppina - Jun 7 2001
I would like to train a dictionary for vector quantization of LSFs for
At every iteration, the new centroid is calculated as the ar...
- Apr 22 2002
It is a pitch-code gain quantization method
It is a kind of 2-dim VQ
y-axis is gc (represented by gbk1->gc bias)
x-axis is gp (represented b...
Eris Ristemena - Jul 19 1999
ok, nice to know this mail group still working.
I am currently doing a project for my Bsc degree, its about Implementation
of speech coding based on LPC 10 using DS...
#ARIJIT BISWAS# - Nov 22 2005
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 ...
- May 12 2000
Thank you for your prompt response. In the meantime, I
have come across a free source code from Sun Microsystems. But I have
trouble understanding i...
samad_ma - Nov 19 2002
I am testing out the G.711 code given below with a wav file but the
wave file given out by the program is the same size and also it does
not play as well....
Jeff Brower - Feb 25 2004
> I need to know the bitstream format of the MELP's 54 bit frame.?. I
> know what are the different bits (the number of bits for different
- Jul 27 1999
> i'm currently developing an algorithm about speech coding using DSP
> processor 16 bit fixed point TMS320C25. Because my program need to be
> operated in floating...
mata mata - Aug 13 2003
I have builded matlab functions over split matrix (SMQ) and split vector
quantization (SVQ) in CELP
but I am not so sure about the results....
- Jun 13 2000
This is my understanding.
If you see the spectrum of voiced speech , it has 3-5 peaks
at formant frequencies and correspoding valleys. Now,
Saloni Shah - Mar 10 2006
My query is regarding the pre selection process done for quantization of gains in section 3.9.2 of ITU-T recommendation for G.729 speech codec standard. ...