Lossless Compression of Digital Audio Mat Hans, Ronald W. Schafer* Client and Media Systems Laboratory HP Laboratories Palo Alto HPL-1999-144 November, 1999 Email: mat_hans@hp.com rws@ece.gatech.edu audio cooling, lossless compression, Internet audio The first part of this paper surveys and classifies the best performing currently available lossless compression algorithms for stereo-cd-quality digital audio signals sampled at 44.1 khz and quantized to 16 bits. This study finds that these algorithms appear to have reached a limit in compression that is very modest compared to what can be achieved with lossy audio coding technology. With this limit as a target, we designed a computationally efficient algorithm for lossless audio compression (which we call AudioPaK). This new lossless compression algorithm uses only a small number of integer arithmetic operations and performs as well, or better than most state-of-the-art lossless compression algorithms. The main operations of the algorithm are prediction with integer coefficients and Golomb-Rice coding. The second part of the paper presents the complete architecture of AudioPaK including suggestions on parallelizing parts of the algorithm using the MMX instruction set. Internal Accession Date Only Center for Signal & Image Processing at the School of Electrical and Computer Engineering, Georgia Institute of the Technology, Atlanta, Georgia. Copyright Hewlett-Packard Company 1999
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