Scalefactor Based Bit Shift FGS Audio Coding
Fangchu Chen, Te-Ming Chiu · 2005
In this paper, a method for applying psychoacoustic effects into the reformation of an MPEG-4 bit sliced arithmetic coded (BSAC) scalable audio bitstream is presented. The method is to rearrange the compressed information based on the scalefactors calculated by the psychoacoustics model in order to reflect the different subjective significance of the compressed data. At low bit rate it improves the coding efficiency by a considerable amount.