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Oversampled Analog-to-Digital Conversion for Digital Audio Systems

An alternative method of digitizing music signals is presented. It relies on the techniques of spectral noise shaping and oversampling, which achieve theoretical and computed signal-to-quantization-noise ratios of 110-120 dB. This encoding scheme is based on high order delta-sigma modulation and is referred to as HLDSM A/D conversion. A hardware conversion of this system was developed measuring 80-dB SQNR and 0.007% total harmonic distortion. Potentially the HLDSM A/D converter offers noise and distortion performance superior to pulse-code modulation, a simpler hardware realization and reduced cost.

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JAES Volume 38 Issue 12 pp. 924-943; December 1990
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