Negative gamma circuit

Details Negative gamma circuit Negative gamma circuit

1976-02-26

1977-04-19

Griffin, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

178DIG16, 178DIG28, 358 32, H04N 316, H04N 953

Patent

active

040189880

ABSTRACT:
A gamma circuit for developing a video output signal having a positive gamma coefficient from an input signal having a negative gamma coefficient includes a multiplier and amplifier which forms an electronic divider. Adjustable reference sources provide a means for varying the gamma of the circuit to correct an input signal gamma of -.35 to -1 to a positive gamma.

REFERENCES:
patent: 3708693 (1973-01-01), Ferrier et al.
patent: 3970774 (1976-07-01), Bazin et al.

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