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

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

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

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?

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

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

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 ...

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...

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

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 ...

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

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

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 ---------------------------------

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

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

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

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

Dear Sir/Mrs My research field is speech enhancement and want to know about bandwidth extension more. If any one have comprehensive...

Dear Sir/Mrs My research field is speech enhancement and want to know about bandwidth extension more. If any one have comprehensive information about these methods please help me to solve my problem about codebook method. I can not convert my LSF's coefficients for narrow band speech to wideband speech LSF's. Regards. Seyed Farid Mousavipour

Hi, I saw that the G.729 has 3+3+4+4 bit to 4 type of gains (Codebook gains) does these bit can serve as an indication to frame...

Hi, I saw that the G.729 has 3+3+4+4 bit to 4 type of gains (Codebook gains) does these bit can serve as an indication to frame energy? thanks,

In g729 spec,about generation of the adaptive-codebook vector, the formula (40) is v(n) = sum[u(n-k+i)*b30(t+3i)]+... but analyse g729 float...

In g729 spec,about generation of the adaptive-codebook vector, the formula (40) is v(n) = sum[u(n-k+i)*b30(t+3i)]+... but analyse g729 float code, it maybe be v(n) = sum[u(n-k-i)*b30(t+3i)]+... Is there error in g729 spec? thanks!