Contrast control wherein reference pulse detection occurs every

Details Contrast control wherein reference pulse detection occurs every Contrast control wherein reference pulse detection occurs every

1993-07-29

1994-07-19

Groody, James J.

Television

Image signal processing circuitry specific to television

Gray scale transformation

348678, H04N 557, H04N 552

Patent

active

053313526

ABSTRACT:
The present invention provides a contrast control circuit capable of controlling the contrast even if the back porch is comparatively short. The contrast control circuit comprises monostable multivibrators (24, 26) which provides a background pulse and a reference pulse alternately, respectively, a switch (SW1) which clamps a video signal while the background pulse is HIGH so that the potential of the pedestal level is zero on an (N+1)th horizontal scanning line, and a switch (SW2) samples the leading edge of a reference pulse inserted in the video signal while the reference pulse is HIGH on an nth horizontal scanning line.

REFERENCES:
patent: 4030125 (1977-06-01), Bedell et al.
patent: 4323923 (1982-04-01), Reneau
patent: 4470067 (1984-09-01), Mino
patent: 4651210 (1987-03-01), Olson
patent: 4679087 (1987-07-01), Torrano, Jr. et al.
patent: 4695886 (1987-09-01), Schofield
patent: 4751577 (1988-06-01), Kawai
patent: 4797744 (1989-01-01), Klemmer et al.

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