Gamma correcting circuit

Details Gamma correcting circuit Gamma correcting circuit

1995-12-19

1997-03-11

Peng, John K.

Television

Image signal processing circuitry specific to television

Gray scale transformation

348674, H04N 5202

Patent

active

056106661

ABSTRACT:
A gamma correcting circuit has a plurality of differential amplifiers having respective input terminals for being supplied with a video signal and respective output terminals connected in common. At least one of the differential amplifiers comprises differential pairs of transistors including transistors whose bases are not connected to the input terminal, emitters are connected to respective resistors, and collectors are connected in common. A plurality of individually energizable and de-energizable external reference voltage supplies are connected to the bases of the transistors whose bases are not connected to the input terminal.

REFERENCES:
patent: 4558363 (1985-12-01), Sugimoto
patent: 5258658 (1993-11-01), Morikawa
patent: 5461430 (1995-10-01), Hagerman
patent: 5483256 (1996-01-01), Ohi

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