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Discussion Groups | Speech Coding | Regarding Vector Quantization in CELP coding
Technical discussions related to Speech Coding (all itu and other vocoders, ACELP, CELP, AMR, etc)
Question regarding G.726 speech codec - Padmalatha Y - Jul 4 12:31:00 2003
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Hi All, I have few doubts regarding Homing that is done in G.726. The ITU test vectors have few homing sequence for which they have few initialization files. The document says homing is done to initialize the application. Now my doubt is in real time say for ex when we speak if it is passing through my g.726 at starting it will be in reset or in homing,if it is homing can you plz explain the concept of it. That is in the homing it is not passing through my init ,so in real time how does it works every time when I speak before that some samples or runned or the previous thing will be stored in that state variables. Can you plz tell me about it. Homing is only for testing or it is one of the necessary thing. |
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ER AAC Scalable - Ramya Desai - Jul 5 15:31:00 2003
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Hi all, Any one of you know information regarding ER AAC Scalable. I have ISO/IEC Specs with me. I want more information regarding Decoder. Please suggest me any papers on "BIT STREAM PARSING" part in Decoder implimentation. Regards, Ramya. |
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Regarding Vector Quantization in CELP coding - mata mata - Jul 7 14:44:00 2003
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hi All...:) anyone know about how to make a codebook in Vector Quantization used in CELP coding ? how to implement Linde, Buzo, Gray (LBG) Algorithm ? thx b4....... regards, arida |
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Re: Regarding Vector Quantization in CELP coding - Author Unknown - Jul 8 17:00:00 2003
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First, I assume you are talking about the fix codebook in CELP coding(another one is adaptive codebook which is just a pitch predictor..). There are all kinds of fixed-codebook used in CELP, i.e.: Algebraic codebook: it is a highly structured codebook with rules on pulse position, # of pulses each frame, and signs. As used in G.729/G.723 low rate. There are also other structured codebooks similar to this, the purpose is to save complexity for fixed-codebook search. Random codebook: just generate a bunch of random vectors with unit power. Other trained codebooks: in order to generate such codebook,you can use closed-loop training or open-loop training. The open-loop training is like any other common VQ codebook training, you first generate a trainig databsae consisting of the residual vectors in the CELP coder, then you can use all kinds of general VQ training method, i.e. GLA method. The best reference book on this is by Allen Gersho's "Vector Quantization". The closed-loop codebook trainig means the training vectors are your frames of real speech. You embeded the whole trainig process inside your CELP coding procedure. The complexity is pretty high in this closed-loop training, but supposely you get better performed codebooks. Thanks, -Chunyan > > hi All...:) > > anyone know about how to make a codebook in Vector Quantization > used in CELP coding ? how to implement Linde, Buzo, Gray (LBG) Algorithm > ? > > thx b4....... > > regards, > arida > > > Yahoo! Groups Sponsor > ADVERTISEMENT > > _____________________________________ > Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. |
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Re: Regarding Vector Quantization in CELP coding - prasadh r - Jul 9 17:42:00 2003
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Hi, As a briefing has already been given...i'll give the book that i reffered..(others were all papers by indviduals)..and found it a bit usefull.. Digital Speech - A.M.Kondoz Bye, Prasadh ramachandran --- wrote: > First, I assume you are talking about the fix > codebook in CELP > coding(another one is adaptive codebook which is > just a pitch > predictor..). There are all kinds of fixed-codebook > used in CELP, i.e.: > Algebraic codebook: it is a highly structured > codebook with rules on pulse > position, # of pulses each frame, and signs. As used > in G.729/G.723 low > rate. There are also other structured codebooks > similar to this, the > purpose is to save complexity for fixed-codebook > search. > Random codebook: just generate a bunch of random > vectors with unit power. > Other trained codebooks: in order to generate such > codebook,you can use > closed-loop training or open-loop training. The > open-loop training is like > any other common VQ codebook training, you first > generate a trainig > databsae consisting of the residual vectors in the > CELP coder, then you > can use all kinds of general VQ training method, > i.e. GLA method. The best > reference book on this is by Allen Gersho's "Vector > Quantization". The > closed-loop codebook trainig means the training > vectors are your frames of > real speech. You embeded the whole trainig process > inside your CELP coding > procedure. The complexity is pretty high in this > closed-loop training, but > supposely you get better performed codebooks. > > Thanks, > > -Chunyan > > > > > > > > > > > > > hi All...:) > > > > anyone know about how to make a codebook in > Vector Quantization > > used in CELP coding ? how to implement Linde, > Buzo, Gray (LBG) Algorithm > > ? > > > > thx b4....... > > > > regards, > > arida > > > > > > > > > > > > > > > > > > > > > > Yahoo! Groups Sponsor > > > > > > ADVERTISEMENT > > > > > > > > > > > > > > > > > > > > _____________________________________ > > > > > > > > > > > > Your use of Yahoo! Groups is subject to the Yahoo! > Terms of Service. __________________________________ |
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