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.
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