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Design and Implementation of an Audio 18-Bit A/D Converter Using Oversampling Techniques

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An 18-bit A/D converter has been designed that uses the principle of oversampling rather than the successive-approximation technique of most converters. The design employs a 2-stage digital filter/decimator to reduce the sampling rate. Unusual digital filter structures are used to reduce the computation rate to a practical level. Extension to 19 bits and beyond is discussed.

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AES - Audio Engineering Society