Variable gain amplifier controlled by ambient noise level

Details Variable gain amplifier controlled by ambient noise level Variable gain amplifier controlled by ambient noise level

1974-03-27

1976-01-20

Claffy, Kathleen H.

179 1P, H03G 102

Patent

active

039340848

ABSTRACT:
An audio amplifier system is provided comprising a variable gain amplifier adapted to receive an input signal, means for detecting periods when the input signal falls below a predetermined level, and sound transducer means arranged to provide a signal proportional to the sound level in the area or part thereof covered by the system for controlling the gain of the amplifier. An inhibitor is provided which is arranged to be controlled by the detecting means so as to prevent any change of the gain of the variable gain amplifier except during periods when the input signal falls below the said predetermined level.

REFERENCES:
patent: 2503391 (1950-04-01), Kannenberg
patent: 2564437 (1951-08-01), Kannenberg
patent: 2575990 (1951-11-01), Augustadt
patent: 2616971 (1952-11-01), Kannenberg
patent: 2668874 (1954-02-01), Augustadt
patent: 3296373 (1967-01-01), Suganuma
patent: 3410958 (1968-11-01), Cohen
patent: 3444323 (1969-05-01), Nagashima et al.
Simple Digitally-Controlled Variable-Gain Linear D.C. Amplifier, by Sedra et al., Electronic Engineering, Mar. 1969, pp. 362-365.

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