AGC circuit with 60 hertz hum compensation

Details AGC circuit with 60 hertz hum compensation AGC circuit with 60 hertz hum compensation

1992-04-09

1993-11-09

Powell, Mark R.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358177, H04N 552, H04N 521

Patent

active

052607925

ABSTRACT:
An AGC circuit comprises an AGC filter, a hum detection circuit, and a time constant control circuit. The hum detection circuit detects a hum component included in an AGC signal. The time constant control circuit automatically controls the time constant of the AGC filter in accordance with the level of a detected hum component in such a manner that when the level of the hum component is large, the time constant of the AGC filter is varied to be small, while when the level of the hum component is small, the time constant of the AGC filter is varied to be large. Thus, the AGC filter outputs an AGC signal from which a noise component, particularly a hum component, is eliminated on the basis of a time constant determined by the time constant control circuit, so an AGC is carried out without the influence of the noise component included in the AGC signal.

REFERENCES:
patent: 3558816 (1971-01-01), Wise
patent: 3684823 (1972-08-01), McVoy
patent: 3740473 (1973-06-01), von der Ohe
patent: 4292598 (1981-09-01), Yasumura
patent: 4884141 (1989-11-01), Hyakutake
patent: 4885546 (1989-12-01), Araki

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