Television receiver with luminance signal clamped offset and re-

Television – Image signal processing circuitry specific to television – Gray scale transformation

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348695, H04N 516

Patent

active

053391144

ABSTRACT:
A video input signal to be displayed is applied to an offset clamp circuit which effects a DC offset of blanking and active video portions of each video line. The DC offset or shift is of an amount and in a polarity sense to place the black level of the active portion of an NTSC color standard signal at a level corresponding to blanking level of the NTSC color standard. Advantageously, subsequent clamping at the shifted level enables contrast control without altering the black level of displayed images.

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"Ire Standards on Television: Definition of Color Terms", 1955, Appendix B Full Text of FCC Tehcnical Standards Amended to Incorporate Color.

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