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Noise-Dependent Sound Reproduction in a Car: Application of a Digital Audio Signal Processor

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A noise-dependent sound reproduction circuit consists of two parts: a noise sensor and a volume- or compression-control circuit. Several possible sensors are discussed. A vibration sensor appears to be the best choice for in-ear application. The noise-dependent volume and compression circuits have been implemented in a digital signal processor. The reproduction of speech and music is significantly improved by using the circuits in a car.

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