4~8kb/s Variable Rate-Finite State-Algebraic Code Excited Linear Prediction Speech Coding Algorithm
Tang Ku · Dianzi xuebao · 2000
4~8kb/s Variable Rate-Finite State-Algebraic Code Excited linear Prediction (VR-FS-ACELP) is a high -quality speech coding algorithm which has shorter time delay and low calculation burden. For line spectrum Pairs, this algorithm uses a highly efficient split vector quantizer based on intra-frame and inter-frame correlations. For adaptive codebook searching, it uses a finite state fractional delay adaptive codebook which has low calculation complexity and high performance. This algorithm also uses a state controlled multimode algebraic codebook and a predictive vector quantizer for gains to further improve the quality of synthesized speech. The non-formal tests show that the speech quality of 4kb/s algorithm is better than that of IS-54 8kb/s VSELP and near to toll quality and the speech quality Of 6kb/s and 8kb/s algorithms reaches toll quality.