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-car 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.

Authors: Kitzen, Wil J.; Kemna, Jan-Willem.; Druyvesteyn, W. F.; Knibbeler, Charles L.; van de Voort, Ad T.
Affiliation: Philips Research Laboratories, 5600 JA Eindhoven, The Netherlands
JAES Volume 36 Issue 1/2 pp. 18-26; February 1988
Publication Date: February 1, 1988

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