Audio system

Details Audio system Audio system

1997-06-20

2000-05-09

Chang, Vivian

Electrical audio signal processing systems and devices

Monitoring of sound

Amplification control responsive to ambient sound

381109, 381107, H03G 320

Patent

active

060614552

ABSTRACT:
An audio system for a vehicle comprises an audio amplifier 14 and a manually adjustable volume control 18 for setting the output level of the sound generated by a loudspeaker 20 connected to the output of the amplifier 14. The amplifier 14 includes distortion sensing means for detecting when the level of distortion of the output signal of the amplifier 14 exceeds a reference threshold and a control circuit 16 reduces the sound output level of the amplifier in response to a signal from the distortion sensing means. The reference threshold of the distortion sensing means 14 is varied in dependence upon the output level setting of the volume control 18 so that the allowable output distortion can be varied based upon user input.

REFERENCES:
patent: 4558460 (1985-12-01), Tanaka et al.
patent: 4628526 (1986-12-01), Germer
patent: 5054078 (1991-10-01), Schorman et al.
patent: 5130665 (1992-07-01), Walden
patent: 5243657 (1993-09-01), Cotton

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