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Discussion Groups | Speech Coding | fixed/algebraic codebook in 3GPP-AMR or G729
Technical discussions related to Speech Coding (all itu and other vocoders, ACELP, CELP, AMR, etc)
fixed/algebraic codebook in 3GPP-AMR or G729 - Mathew John - Jun 1 6:18:00 2002
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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 ...Equation (43) in 3GPP TS 26.190 V5.0.0 or (Ck)^2 (SUM d(n) Ck(n))^2 ------ = ------------------- Ek Ck phi ck ....eqaution (53) in G.729 The >theoritical background derivations to arrive at the eqn,espcially >the derivation of matrix phi would be most helpful thanks in advance John |
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