Automatic brightness limiter circuit

Details Automatic brightness limiter circuit Automatic brightness limiter circuit

1976-07-07

1978-10-17

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358243, 358176, H04N 514, H04N 568

Patent

active

041212525

ABSTRACT:
In a television receiver having a peak value type AGC circuit for maintaining the amplitude difference between a carrier zero level and the peak value of a composite video signal amplified by a high frequency amplifier and a video intermediate frequency amplifier at a constant magnitude, an automatic brightness limiter (ABL) circuit is provided which controls the AGC circuit such that when the beam current exceeds a predetermined value and the carrier zero level approaches the peak value, a composite video signal of reduced amplitude is produced.

REFERENCES:
patent: 3147341 (1964-09-01), Gibson
patent: 3735029 (1973-05-01), Sunstein
patent: 3914545 (1975-10-01), Engel
patent: 4017681 (1977-04-01), Smeulers et al.
Kiver, Television Simplified, pp. 193-196, Van Nostrand Reinhold Co., 1973.

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