Some digital audio broadcasting systems, such as Satellite Digital Audio Radio Services (SDARS), transmit many audio programs over the same transmission channel. Instead of splitting up the channel into fixed bitrate subchannels, each carrying one audio program, one can dynamically distribute the channel capacity among the audio programs. We describe an algorithm which implements this concept taking into account statistics of the bitrate variation of audio coders and perception. The result is a dynamic distribution of the channel capacity among the coders depending on the perceptual entropy of the individual programs. This solution provides improved audio quality compared with fixed bitrate subchannels for the same total transmission capacity. The proposed scheme is non-iterative and has a low computational complexity.

Authors: Faller, Christof; Haimi-Cohen, Raziel; Kroon, Peter; Rothweiler, Joseph
Affiliations: Media Signal Processing Research, Agere Systems, Murray Hill, NJ ; Advanced Technology Group, Lucent Technologies, Murray Hill, NJ (See document for exact affiliation information.)
AES Convention: 113 (October 2002) Paper Number: 5684
Publication Date: October 1, 2002
Subject: Low Bit-Rate Coding

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