Signal limit detection circuit

Details Signal limit detection circuit Signal limit detection circuit

H - Electricity

03

C

328/167

H03C 1/00 (2006.01) H03K 5/24 (2006.01)

Patent

CA 1087257

APPARATUS FOR AUTOMATIC GAMMA CONTROL OF TELEVISION COLOR SIGNALS Abstract of the Disclosure A plurality of comparators are used to compare the red, blue and green color signals of a color television camera against a first and second predetermined signal level threshold corresponding to selected values of grey scale. The outputs of the comparators are combined to ascertain the difference in signal amplitude between the red, blue and green signals with respect to the first and second predeter- mined signal thresholds which represent grey. If the ampli- tude deviation of the red, blue and green color signals is within the threshold limits, a control signal adjusts the gamma characteristics of the blue and red color channels to match the amplitude of the red and blue color signals to the amplitude of the green color signal to correct to grey. If the red, blue and green color signal deviation is without the threshold limits, the color signal is assumed correct and no adjustment is made. - 1 -

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