This paper presents the strategies used to achieve efficient lossless compression or packing of PCM audio waveform data, allowing storage and transmission at greatly reduced data rates without any alteration of the signal. The disadvantages of simpler difference schemes and the benefits of more advanced schemes using IIR prediction with Huffman coding are explained and described, particularly with regard to the unique requirements of the future HQAD (High Quality Audio Disc) standard using high density CD media.
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