Correction system for video signals having a limited amplitude r

Details Correction system for video signals having a limited amplitude r Correction system for video signals having a limited amplitude r

1974-02-25

1976-03-23

Griffin, Robert L.

Telegraphy

Systems

Simplex-reversing periodic

178DIG25, H04N 316

Patent

active

039461521

ABSTRACT:
The video signals are applied to a standard aperture correction circuit and also to a non-linear circuit. The output of the non-linear circuit and the output of the standard aperture correction circuit are applied to the two inputs of a modulator whose output is combined in a summing circuit with video signals delayed by a time delay corresponding to the time delay in the non-linear circuit and modulator. In a preferred embodiment the non-linear transfer function corresponds to A.sup.2 -A and is achieved by a double-balanced modulator the DC level at whose inputs is adjusted to yield the desired transfer function.

REFERENCES:
patent: 2939910 (1960-06-01), Blake
patent: 3444318 (1969-05-01), Monteath

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