Study on the high quality 4kbit/s speech coding algorithm
Feng Chongxi · Journal of Tsinghua University(Science and Technology) · 1999
kbit/s Finite State Algebraic Code Excited Linear Prediction (FS ACELP) is a high quality speech coding algorithm which has shorter time delay and low calculation burden. For line spectrum pairs, this algorithm used a high efficient split vector quantizer based on intra frame and inter frame correlations. For adaptive codebook searching, it used a finite state fractional delay adaptive codebook which has low calculation complexity and high performence. This algorithm also used a state controled multimode algebraic codebook and a predictive vector quantizer for gains to forther improve the quality of synthesized speech. The informal tests show that the speech quality of 4kbit/s FS ACELP is much better than that of IS 54 8kbit/s VSELP and near to that of G.729 8kbit/s CS ACELP, the MOS score is about 3.9.