Automatic sound volume controller

Details Automatic sound volume controller Automatic sound volume controller

1990-06-22

1992-04-21

Isen, Forester W.

Electrical audio signal processing systems and devices

Monitoring of sound

Amplification control responsive to ambient sound

381 86, 381108, H03G 320

Patent

active

051075393

ABSTRACT:
An automatic sound volume controller for use with audio equipment mounted on a vehicle adapted that the level of an input audio signal and that of the noises coming inside the cabin in running state are detected, and the difference therebetween is obtained. By use of different gain levels reflecting the level difference, a direct sound signal and an effect sound signal are individually amplified for synthesis. This makes it possible to prevent the added effect sounds from being masked by the running noises because the level of the effect sound signal varies with the noises. As a result, the reproduced sounds supplemented by the effect sounds can be heard clearly while the vehicle is running. With the vehicle in stationary state, the effect sounds are kept from getting excessive, protecting the vehicle passengers from the unpleasant sensation conventionally associated with the apparatus of this kind.

REFERENCES:
patent: 4254303 (1981-03-01), Takizawa
patent: 4553257 (1985-11-01), Mori et al.
patent: 4628526 (1986-12-01), Germer
patent: 4694497 (1987-09-01), Kasai et al.

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