MPEG-4 BSAC has fine grain scalability functionality that bitstream can be truncated and decoded at any layer from one full bitstream. This fine grain scalability supports adaptive transmission and decoding according to user control, terminal specifications and network environment. In current BSAC scheme, however, as the transmitted layers become less and less the decoded output loses its high frequency signals and the sound quality becomes degraded. In this paper, A novel way was proposed which recovers the missing frequency signals when the decoded bitrate is lower than top bitrate. It provides full bandwidth at any bitrate below top bitrate and graceful degradation of sound quality in scalable reproduction. It also improves audio quality at low bitrate with top layer.

Authors: Kim, Dohyung; Kim, Junghoe; Kim, Miyoung; Kim, Sangwook; Oh, Eunmi
Affiliation: Samsung Advanced Institute of Technology
AES Conference: 29th International Conference: Audio for Mobile and Handheld Devices (September 2006)
Paper Number: 3-3
Publication Date: September 1, 2006
Subject: Audio for Mobile & Handheld Devices

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