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Oversampled Analogue-to-Digital Conversion for Digital Audio Systems

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An alternative method of digitizing music signals is presented which relies on the techniques of spectral noiseshaping and oversampling which achieves theoretical and computed SQNR of (110-120) dB. This encoding scheme is based upon higher order delta-sigma modulation and is referred to as HLDSM-ADC. A hardware version of this system was developed measuring 80 dB SQNR and .007% THD. Potentially the HLDSM-ADC developed and analyzed in this paper offers noise and distortion performance superior to PCM, a simpler hardware realization and reduced cost.

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