Circuit for controlling contrast in a digital television receive

Details Circuit for controlling contrast in a digital television receive Circuit for controlling contrast in a digital television receive

1990-08-31

1992-08-25

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358168, 358176, H04N 557

Patent

active

051423650

ABSTRACT:
A circuit for controlling contrast signal is disclosed. The circuit processes contrast signal separately from the original composite video signal and then the pedestal level of the contrast signal is converted to be at zero level. Thereafter, such processed contrast signal is mixed with the original composite video signal. In structure, the contrast control circuit includes: a color/brightness signal separator for separating color signal and brightness signal from said digital composite video signal; a level converter for converting pedestal level of the brightness signal to be at zero level; a gain controller for controlling the output gain of the level converter; a delay controller for delaying the brightness signal output from the color/brightness signal separator; a mixer for mixing the outputs of the delay controller and the gain controller; and an overflow detection and output section for detecting an overflow from the output of said mixer so that if the overflow is detected, the overflow detection value is restricted to a maximum value.

REFERENCES:
patent: 4121252 (1978-10-01), Saiki
patent: 4126884 (1978-11-01), Shanley
patent: 4682231 (1987-07-01), Yamakawa
patent: 4979044 (1990-12-01), Hong
patent: 4982287 (1991-01-01), Lagoni

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