Title :
ITU-T 8-kbit/s standard speech codec for personal communication services
Author :
Kataoka, Akitoshi ; Adoul, Jean-Pierre ; Combescure, Pierre ; Kroon, Peter
Author_Institution :
NTT Human Interface Labs., Tokyo, Japan
Abstract :
An 8-kbit/s speech coder (G.729) has been standardized by the ITU-T. This coder will be used for the Future Public Land Mobile Telecommunication Systems and will be suitable for personal communication services. To achieve a short-delay and toll-quality, this coder introduces six new features: adaptive spectral shaping, LSP quantization using interframe prediction, algebraic codebook excitation, VQ gain quantization with backward prediction, an improved postfilter, and frame erasure concealment. Subjective testing indicates that the quality of this coder is equivalent to that of 32-kbit/s adaptive differential pulse code modulation
Keywords :
algebraic codes; delays; filtering theory; land mobile radio; personal communication networks; prediction theory; speech codecs; speech coding; telecommunication standards; vector quantisation; 32 kbit/s; 8 kbit/s; ADPCM; Future Public Land Mobile Telecommunication Systems; ITU-T; LSP quantization; VQ gain quantization; adaptive differential pulse code modulation; adaptive spectral shaping; algebraic codebook excitation; backward prediction; frame erasure concealment; interframe prediction; personal communication service; personal communication services; postfilter; short-delay; standard speech codec; subjective testing; toll-quality; Code standards; Communication standards; Filters; North America; Personal communication networks; Pulse modulation; Quantization; Speech codecs; Speech coding; Testing;
Conference_Titel :
Universal Personal Communications. 1995. Record., 1995 Fourth IEEE International Conference on
Conference_Location :
Tokyo
Print_ISBN :
0-7803-2955-4
DOI :
10.1109/ICUPC.1995.497123
