Automatic gain and frequency characteristic control unit in audi

Details Automatic gain and frequency characteristic control unit in audi Automatic gain and frequency characteristic control unit in audi

1985-05-31

1987-02-17

Laroche, Eugene R.

Amplifiers

With semiconductor amplifying device

Including gain control means

330149, 330302, H03G 318

Patent

active

046442928

ABSTRACT:
An automatic gain control unit particularly adapted for vehicular use is disclosed. The ambient noise level inside the vehicle is detected, as is the level of the audio signal. A difference is formed between detection signals thus produced, and a frequency characteristic of a gain varying device, inserted in an audio signal path of the audio device, is varied according to this difference.

REFERENCES:
patent: 3160707 (1964-12-01), Meyers
patent: 3452282 (1969-06-01), Beres
patent: 3544901 (1970-12-01), Wood
patent: 4019160 (1977-04-01), Kam
patent: 4034308 (1977-07-01), Wermoth et al.

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