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.

Authors: Kitzen, Wil J.; Kemna, J. W.; Druyvesteyn, W. F.; Knibbeler, C. L. C. M.; v.d. Voort, A. T. A. M.
Affiliation: Philips Research Laboratories, Nederlandse Philips Bedrijven, Eindhoven, The Netherlands
AES Convention: 2r (May 1987) Paper Number: 2658
Publication Date: May 1, 1987

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