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Filtering Sigma-Delta Audio Signals Directly

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The utility of directly processing sigma-delta encoded audio signals is discussed. The problems of overflow and rounding in such a system and the consequential noise build-up are investigated. An efficient and cost-effective method of implementing a second-order filter, given the higher sample rate, is presented. The problems of coefficient accuracy are also discussed.

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Permalink: http://www.aes.org/e-lib/browse.cfm?elib=7334

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