SYNTHESIS FILTER OPTIMIZATION AND CODING: APPLICATIONS TO CELP
P. Kabal · 1988
The success of Code-Exclted Llnear Predlctron (CELP) for codlng speech signals depends on the accurate representatlon of the pltch structure and the formant structure of the Input speech In thls type of coder an excltatton waveform chosen from a dlctlonary of waveforms drlves a cascade of a pltch and a formant synthesis fllter Thls paper develops the methodology to allow for a Joint optlmlzatlon of the waveform selection process waveform scallng. and the pltch filter determlnatlon Methods to accommodate hlgh-pitch speakers (pltch lag smaller than the analysls frame slze) are given Addltlonally. the requlrements for codlng the synthesls parameters Into a bit stream at 4 8 kbis are discussed