Gamma compensating circuit method and apparatus of a color TV ca

Details Gamma compensating circuit method and apparatus of a color TV ca Gamma compensating circuit method and apparatus of a color TV ca

1991-09-30

1994-08-02

Groody, James J.

Television

Image signal processing circuitry specific to television

Gray scale transformation

H04N 969

Patent

active

053350685

ABSTRACT:
A nonlinear processing apparatus in which a common input signal is input to multiple amplifiers having mutually different amplification factors and different offset voltages and a non-adder/mixer selectively outputs the output of each amplifier selected for each level region of the input signal, thereby providing a final nonlinear output. It is therefore possible to independently set and adjust the output characteristic for each amplifier (the frequency response and offset voltage in the case where this invention is applied to a gamma compensator), thereby ensuring highly-accurate setting and adjustment of the output characteristic over the entire output level range.

REFERENCES:
patent: 3226475 (1965-12-01), Percival
patent: 3358130 (1967-12-01), Miura et al.
patent: 4000366 (1976-12-01), Sirrine
patent: 4217574 (1980-08-01), Anderson
patent: 4578715 (1986-03-01), Yamaguchi
Rodriguez-Izquierdo et al, "High Gain Integrated Ampifiers Stabilize Function Generators", Annales De 'l Association International Pour Le Calcul Analogique, No. 4, Oct. 1971.
Analog Devices: "Data Acquisition Products Catalog", 19768, pp. 7-20: Operational Amplifiers, Analog Devices, Inc. Norwood, US, p. 19.

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