Hybrid multi-mode/multi-rate CS-ACELP speech coding for adaptive voice over IP

Authors:
G. Ruggeri;E. Beritelli;S. Casale
Affiliations:
Dipt. di Ingegneria Informatica e delle Telecomunicazioni, Catania Univ., Italy;-;-
Venue:
ICASSP '01 Proceedings of the Acoustics, Speech, and Signal Processing, 200. on IEEE International Conference - Volume 02
Year:
2001

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Adaptive time scale modification of speech for graceful degrading voice quality in congested networks for VoIP applications

Signal Processing

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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.