Title :
Hybrid multi-mode/multi-rate CS-ACELP speech coding for adaptive voice over IP
Author :
Ruggeri, G. ; Beritelli, F. ; Casale, S.
Author_Institution :
Dipt. di Ingegneria Informatica e delle Telecomunicazioni, Catania Univ., Italy
Abstract :
This paper presents a hybrid multi-mode/multi-rate, toll quality CS-ACELP coder developed for voice over IP applications. The coder uses coding modes compatible with the three 6.4, 8, and 11.8 kbit/s coding schemes standardised by ITU-T in G.729. In particular, the algorithm presents 4 coding categories, with an average bit rate ranging between about 3 and 8 kbit/s, that adapt the rate to changes in network conditions
Keywords :
Internet telephony; adaptive codes; algebraic codes; code standards; linear predictive coding; speech codecs; variable rate codes; 11.8 kbit/s; 3 to 8 kbit/s; 6.4 kbit/s; 8 kbit/s; G.729 speech coding; ITU-T coding; VoIP; average bit rate; coding modes; conjugate-structure algebraic-code-excited linear prediction; hybrid multi-mode/multi-rate toll quality CS-ACELP coder; voice over IP; Background noise; Bit rate; Codecs; Delay; Internet telephony; Noise robustness; Quality of service; Speech coding; Switching circuits; Telecommunications;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 2001. Proceedings. (ICASSP '01). 2001 IEEE International Conference on
Conference_Location :
Salt Lake City, UT
Print_ISBN :
0-7803-7041-4
DOI :
10.1109/ICASSP.2001.941019
