Automatic gain control circuit

Details Automatic gain control circuit Automatic gain control circuit

1977-08-15

1978-09-19

Murray, Richard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 552

Patent

active

041158121

ABSTRACT:
A signal having a maximum amplitude corresponding to a pedestal level of a composite video signal is produced by removing a horizontal synchronizing signal from the composite video signal. An automatic gain control signal is derived from the first mentioned signal in dependence of the peak value thereof to control a high frequency amplifier and or an intermediate frequency amplifier so that the pedestal portion at the maximum amplitude level of the composite video signal is maintained constant. In this way, a stabilized pedestal portion or the black level can be attained, which in turn results in a stabilized contrast.

REFERENCES:
patent: 2241553 (1941-05-01), Kallman et al.
patent: 2885472 (1959-05-01), Billin et al.
patent: 2938950 (1960-05-01), Gent
patent: 2942063 (1960-06-01), Billin
patent: 3249695 (1966-05-01), Loughlin et al.

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