Noise detecting circuit having noise-immune AGC

Details Noise detecting circuit having noise-immune AGC Noise detecting circuit having noise-immune AGC

1977-11-04

1980-02-19

Martin, John C.

325479, 325480, H04B 110

Patent

active

041896793

ABSTRACT:
In an audio reproducing system including mixer means, intermediate frequency transformer means, first gate means and audio reproducing means following said first gate means, a noise detecting circuit comprising detector means for detecting a high frequency component of the output signal of said mixer means; amplifier means for amplifying a signal having said high frequency component from said detector means; pulse generator means for producing a pulse in response to a noise component in the output of said amplifier means; automatic gain control means for controlling the gain of said amplifier means, second gate means provided between said automatic gain control means and said amplifier means; and means for applying said pulse to said first and second gate means to operate them to thereby prevent application of said noise component to said audio reproducing means.

REFERENCES:
patent: 3241073 (1966-03-01), Hummel
patent: 3339144 (1967-08-01), Squires
patent: 3624288 (1971-11-01), Hofmann
patent: 4042959 (1977-08-01), Klein

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