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Oversampled Analogue-to-Digital Conversion for Digital Audio Systems

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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