This paper describes the MUSICAM digital audio source coding process which achieves a six to twelve fold bit-rate reduction over conventional digital PCM sound coding used on Compact Discs and in the studio. The stereophonic sound signal is encoded by a sub-band coding compression technique assisted by a perceptual model whereas the decoder uses an optimized polyphased network filter bank requiring very low computational power. The algorithm has been designed to take into account a number of practical operational constraints in the field of broadcasting, telecommunication and recording on digital storage media. Its high audio quality and simplicity have led the Eureka 147 - DAB partners to adopt it for Digital Audio Broadcasting, and the ISO/MPEG/Audio has decided to base the future sound compression standard (accompanying compressed video) on this bit structure and coding principle.

Author: Dehery, Yves-Francois
Affiliation: Centre Commun d'Etudes de Telediffusion et de Telecommunications (CCETF), Cesson-Sevigne, France
AES Conference: 10th International Conference: Images of Audio (September 1991)
Paper Number: 10-011
Publication Date: September 1, 1991
Subject: Images of Audio

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