Automatic gain control system

Details Automatic gain control system Automatic gain control system

1985-05-30

1986-12-16

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358177, 455246, H04N 552

Patent

active

046301178

ABSTRACT:
An automatic gain control system which measures the noise content of a received video signal and adjusts the gain of a radio frequency amplifier and a tuner to compensate for variations in noise levels. The apparatus uses a high frequency filter to strip the video information portion of a composite video signal to obtain only the noise component. The noise component is scaled and used in an automatic gain control feedback loop to control the gain of a radio frequency amplifier and a tuner. The system includes a standard AGC loop to regulate tuner gain for large amplitude signals to prevent overload.

REFERENCES:
patent: 2974191 (1961-03-01), Cotsworth, III et al.
patent: 4030035 (1977-06-01), Ienaka et al.
patent: 4148068 (1979-04-01), Hofmann
patent: 4370520 (1983-01-01), Malchow
patent: 4455681 (1984-06-01), Wile

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