FS-1016 Adaptive Codebook

Started by Ray McCarthy in Speech Coding16 years ago

Hi All, I'm having a bit of trouble with the adaptive codebook.From theory it seems that the codebook is a 256 x 60 array,so to...

Hi All, I'm having a bit of trouble with the adaptive codebook.From theory it seems that the codebook is a 256 x 60 array,so to speak, but from the standard code it seems that it is a 256 x 1 array and to get an adptive excitation,you select different elements of the codebook.I dont


G729 generation of fixed codebook

Started by Anonymous in Speech Coding18 years ago 1 reply

Hi all, How can we find the appropriate positions(m0,m1,m2,m3) for placing the unit pulses and its sign(+/-) in the fixed codebook...

Hi all, How can we find the appropriate positions(m0,m1,m2,m3) for placing the unit pulses and its sign(+/-) in the fixed codebook vector? I mean " c(n) = s 0d(n - m 0 ) + s 1d(n - m 1 ) + s 2d(n - m 2 ) + s 3d(n - m 3 ) n = 0,...,39 The codebook vector c(n) is const


augmented codebook construction in iLBC

Started by jiaq...@yahoo.com in Speech Coding14 years ago

Dear all, I am wondering why, in iLBC, the augmented codebook is constructed in such a way as described in RFC3951. The base and expanded...

Dear all, I am wondering why, in iLBC, the augmented codebook is constructed in such a way as described in RFC3951. The base and expanded codebooks together model periodicity in the signal, but what does the augmented codebook does? Many thanks. Jiaquan


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...


fixed/algebraic codebook in 3GPP-AMR or G729

Started by Mathew John in Speech Coding17 years ago

Dear all, Can anyone give me/direct me to a DETAILED/any explanation of the fixed codebook(of G729)/algebraic codebook(of 3GPP...

Dear all, Can anyone give me/direct me to a DETAILED/any explanation of the fixed codebook(of G729)/algebraic codebook(of 3GPP AMR ACELP) with specific refrence to Qk = (x2Hck)^2 (d Ck)^2 (Rk)^2 --------- = ------ = ------- CkH HCk Ck phick Ek ...Equat


Determining sound intensity from G.729 parameters

Started by furiousgame in Speech Coding17 years ago 8 replies

Using only the G.729 parameters (codebook values, codebook indices, pitch periods, and pitch and codebook gains) or the line...

Using only the G.729 parameters (codebook values, codebook indices, pitch periods, and pitch and codebook gains) or the line spectral pairs, how can the intensity of a sound be determined?


CELP IN SIMULINK

Started by neeta chapatwala in Speech Coding12 years ago

Hello, I am doing M.Tech. project on CELP in real time using DSP kit TMS320c6713 Note that I had refer CELP demo given in simulink. ...

Hello, I am doing M.Tech. project on CELP in real time using DSP kit TMS320c6713 Note that I had refer CELP demo given in simulink. I am using simple gaussian codebook ,LPC parameters(LPC co-efficients and reflection co-efficients). My problem is how to find index for codebook? what will be gain for excitation signal coming from codebook?This gain will be constant or variable ...


Adaptive Codebook generation in AMR speech codec

Started by abhi...@gmail.com in Speech Coding14 years ago

Hi, I am working on a project that implements CELP coding, as in AMR codec for GSM. The codec uses a 'codebook' to store 'code vectors', which...

Hi, I am working on a project that implements CELP coding, as in AMR codec for GSM. The codec uses a 'codebook' to store 'code vectors', which are compared with excitation vectors and the error minimised till a match is found. This match is used to synthesise speech. The spec I am using, 3GPP TS 26.090 ver 6.0.0, r6, specifies codebook architecture but not how it is created. So how is this


Regarding Algebraic Codebook in CELP

Started by mata mata in Speech Coding16 years ago

Hi all, I need help in estimating the positions and pulses of algebraic codebook it is said in the standards (etsi 05.90) : ...

Hi all, I need help in estimating the positions and pulses of algebraic codebook it is said in the standards (etsi 05.90) : "First, for each of the five tracks the pulse positions with maximum absolute values b(n) are searched.From global maximum value for all the pulse p


Regarding algebraic codebook search of CELP

Started by mata mata in Speech Coding16 years ago

Hi all, did anyone had builded a matlab function of algebraic codebook search in CELP ? is it possible to build a simulation...

Hi all, did anyone had builded a matlab function of algebraic codebook search in CELP ? is it possible to build a simulation program of CELP using matlab ? -regards arida ---------------------------------


some queries about g729a codec

Started by Anonymous in Speech Coding19 years ago

Hi Friends, in the g729a recommendation, the excitation is modelled using an "algebraic codebook". what is meant by an...

Hi Friends, in the g729a recommendation, the excitation is modelled using an "algebraic codebook". what is meant by an "algebraic" codebook ?? also, the postfiltering stage of the decoder uses a tilt compensation filter to compenstate for the spectra


regarding adaptive c/b in AMR encoder

Started by Sameer Kibey in Speech Coding16 years ago 1 reply

hi all in the AMR standard, a signal called y[n] is used. it is the "filtered adaptive codebook vector" and is defined as: ...

hi all in the AMR standard, a signal called y[n] is used. it is the "filtered adaptive codebook vector" and is defined as: y[n] = v[n]*h[n] (read convolution of v[n] and h[n]), where v[n] => adaptive codebook vector and h[n] => impulse response of teh wei


Gain predicition in G729

Started by adithya rao k in Speech Coding16 years ago

Hiii, In the G 729 encoder part the gain prediction block(3.9.1 in ITU document) is confusing. I was not able to find the way...

Hiii, In the G 729 encoder part the gain prediction block(3.9.1 in ITU document) is confusing. I was not able to find the way to calculate the fixed codebook gain and the gamma value. I am not able to find the flow of the calculating the fixed codebook gain. I don't know eithe


Need optimum adaptive codebook gains in G.723.1

Started by koro in Speech Coding15 years ago

Dear all! I am fresh in speech coding, and now I use the G.723.1 to compress our TTS database. I want to retrain the two gain...

Dear all! I am fresh in speech coding, and now I use the G.723.1 to compress our TTS database. I want to retrain the two gain tables used in the adaptive codebook which are 85 and 170 entries. Now I need the "optimum" values(i.e.,the unquantized values) of those 5


IS-54 VSELP source code and/or codebook parameters

Started by dbga...@gmail.com in Speech Coding10 years ago

Hi, I am working on an old two-way radio simulation project running on 8000bps sampling rate using the VSELP vocoder. Does anyone here...

Hi, I am working on an old two-way radio simulation project running on 8000bps sampling rate using the VSELP vocoder. Does anyone here still have the IS-54 VSELP source code or at least a sample of sotchastic codebook parameters(1024 with order of 10)? Not sure, if it's really GSM-HR. Perhaps, something similar to this bit allocation: (from an old TI tech paper) MODE 2b Voicing Mode ...


Depth first search in G729A speech coder

Started by Narasimha Rao B.V. in Speech Coding20 years ago 1 reply

Hi there, somebody please explain me about the depth first codebook search algorithm used in G729A (CS-ACELP). Also suggest...

Hi there, somebody please explain me about the depth first codebook search algorithm used in G729A (CS-ACELP). Also suggest some references (if any) to understand the logic behind the depth first search algorithm (specific to G729A codebook search). Th


G728

Started by manoj garg in Speech Coding18 years ago

hi, i am working on G728. I read in a book that codebook structuring is done in G728. However in itu-t document for G728 "coding...

hi, i am working on G728. I read in a book that codebook structuring is done in G728. However in itu-t document for G728 "coding of speech at 16kbps using low delay code excited linear prediction" i didn't find codebook structuring. So is there any itu-t document wher


CS_ACELP information

Started by beatriz rodriguez in Speech Coding17 years ago 1 reply

Hi, I?m working on G.729 but I don?t understand exactly what is an conjugate structure codebook. Could somebody give me a...

Hi, I?m working on G.729 but I don?t understand exactly what is an conjugate structure codebook. Could somebody give me a refernce. Thanks in advance


G729 adaptive codebook

Started by Geoff Meltzner in Speech Coding17 years ago

Hi, I am currently trying to write a Matlab implementation of the G.729 codec and right now, the output of my decoder sounds less...

Hi, I am currently trying to write a Matlab implementation of the G.729 codec and right now, the output of my decoder sounds less than normal, to say the least. As such, I have a couple of questions that I hope that someone on this list can help me with: 1. In the decode


about ISPP(Interleaved single pulse permutation)

Started by suman_das81 in Speech Coding17 years ago

hi all, i want to know about ISPP design for codebook structure. can anybody help me where can i get material for the same. ...

hi all, i want to know about ISPP design for codebook structure. can anybody help me where can i get material for the same. thank u