Title :
A 6.6 kb/s CELP speech coder: high performance for GSM half-rate system
Author :
Ai, Hongmei ; Yang, Xingiun ; Lu, Dajin
Author_Institution :
Dept. of Electron. Eng., Tsinghua Univ., Beijing, China
Abstract :
The paper describes a 6.6 kb/s speech coder with high performance, suitable for the GSM half-rate system. The coder is based on the codebook excited linear prediction (CELP) technique. Line spectrum pair (LSP) representation is introduced. Fast stochastic codebook search procedures based on a linear-shifted Gaussian noise sequence are proposed and a detailed description of gain quantizers and adaptive post-filter is presented. This coder structure also exhibits good performance at a data rate as low as 4.8 kb/s
Keywords :
adaptive filters; cellular radio; codecs; digital radio systems; filtering and prediction theory; linear predictive coding; random noise; recursive functions; search problems; speech coding; vocoders; 4.8 to 6.6 kbit/s; CELP speech coder; GSM half-rate system; LSP representation; adaptive post-filter; codebook excited linear prediction; coder structure; fast stochastic codebook search procedures; gain quantizers; line spectrum pair; linear-shifted Gaussian noise sequence; performance; Bit rate; Decoding; GSM; Gaussian noise; Interpolation; Linear predictive coding; Performance analysis; Speech analysis; Speech coding; Stochastic resonance;
Conference_Titel :
Speech, Image Processing and Neural Networks, 1994. Proceedings, ISSIPNN '94., 1994 International Symposium on
Print_ISBN :
0-7803-1865-X
DOI :
10.1109/SIPNN.1994.344851
