some queries about g729a codec

Started by Unknown October 17, 2000
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 spectral tilt of the short-term
postfilter. but why does the short-term filter introduce a spectral
tilt, when it is only supposed to emphasize the formant frequencies ??