Gamma correction circuit

Details Gamma correction circuit Gamma correction circuit

1982-06-02

1984-10-30

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

328142, H04N 520

Patent

active

044802684

ABSTRACT:
A gamma correction circuit is provided with a first circuit including a first linear element and a first non-linear element connected in series in the above order and a second circuit including a second non-linear element and a second linear element connected in series in the above order. A first connection point is located between the first linear element and the second non-linear element and a second connection point is located between the first non-linear element and the second linear element. A current source for converting a video signal voltage into a current output is connected to the second connection point. Two common collector (or common drain) transistors have their collectors (or their drains) connected to a power supply line. The input terminals of these transistors are connected to the connection point between the first linear element and the first non-linear element and to the connection point between the second non-linear element and the second linear element respectively, and the output terminals are connected to each other through a resistor. In order to decrease the junction capacitance of the transistors as the video signal voltage level increases, a voltage regulator circuit is connected between the power supply line and the first connection point.

REFERENCES:
patent: 3752905 (1973-08-01), Schneider
patent: 4015079 (1977-03-01), Satov et al.
patent: 4278839 (1981-07-01), Marik

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