Fourth European Conference on Speech Communication and Technology

Madrid, Spain
September 18-21, 1995

Low and Variable Bit-Rate Speech Coding for ATM Networks

S. D. Watson (1), B. M. G. Cheetham (1), W. T. K. Wong (2), A. V. Lewis (2)

(1) Department of Electrical Engineering and Electronics, The University of Liverpool, Liverpool, UK
(2) BT Laboratories, Martlesham Heath, Ipswich, UK

This paper investigates the use of a variable low bit-rate speech transmission method for Asynchronous Transfer Mode (ATM) networks, A modified version of an existing 8kbit/s ACELP speech coder, making it an on-off source controlled variable bit-rate coder, referred to as AV-ACELP, has been adopted for this investigation. A possible adaptation of this coder to ATM is proposed and the effects of cell loss, cell delay and congestion control are examined. This paper discusses a suitable packetization method, ATM adaptation layer function and cell loss recovery scheme. Results obtained from this study are compared with results obtained from a standard 32kbit/s embedded ADPCM coder.

Full Paper

Bibliographic reference.  Watson, S. D. / Cheetham, B. M. G. / Wong, W. T. K. / Lewis, A. V. (1995): "Low and variable bit-rate speech coding for ATM networks", In EUROSPEECH-1995, 727-730.