On-vehicle automatic loudness control apparatus

Details On-vehicle automatic loudness control apparatus On-vehicle automatic loudness control apparatus

1990-05-30

1992-01-14

Isen, Forester W.

Electrical audio signal processing systems and devices

Monitoring of sound

Amplification control responsive to ambient sound

381108, 381 86, H03G 320

Patent

active

050816829

ABSTRACT:
An on-vehicle automatic loudness control apparatus according to the present invention comprises a volume control circuit for receiving an audio signal from an audio signal source, the volume control circuit controlling an output level therefrom in accordance with a first signal supplied thereto; a level detecting unit for receiving the output level from volume control circuit, the level detector controlling an output level therefrom in accordance with a second signal supplied thereto, a noise detecting unit for detecting environmental noise in a passenger space of a car to output a noise signal in accordance with the environmental noise level; a relative level detecting circuit for comparing the output level from the level detector with the noise signal to output a third signal indicative of a relative magnitude between the output level from the level detector and the noise signal; and a control circuit for outputting the first signal and the second signal in accordance with the third signal. The second signal causes the output level from level detector to decrease when the output level of the volume control circuit is increased, and the second signal causes the output from level detector to increase when the output level from volume control circuit is decreased.

REFERENCES:
patent: 3814856 (1974-06-01), Dugan
patent: 4061874 (1977-12-01), Fricke et al.
patent: 4406923 (1983-09-01), Burne, III et al.
patent: 4553257 (1985-11-01), Mori et al.
patent: 4628526 (1986-12-01), Germer
patent: 4953221 (1990-08-01), Holly et al.

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