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Lossless Coding of Audio Spectral Coefficients using Selective Bitplane Coding

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Executive Summary

In this paper, a novel lossless coding method of spectral coefficients for audio codec is proposed. Conventional lossless coder directly codes the spectral coefficients based on their statistical characteristics, but does not provide the high coding efficiency due to its simple structure. To solve this limitation, a new lossless coding scheme consisting of bitplane coding and run-length coding is proposed. In the proposed scheme, the spectral coefficients are first transformed by bitplane coding to a bit stream, and the resulting bit stream is coded by run-length and finally entropy coded. In addition, the coding performance is further increased by applying the proposed bitplane coding selectively to spectral bands.

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