Circuit for the continuous zoom adjustment of the picture width

Details Circuit for the continuous zoom adjustment of the picture width Circuit for the continuous zoom adjustment of the picture width

1994-06-02

1996-06-25

Groody, James J.

Television

Image signal processing circuitry specific to television

Sweep expansion or reduction

348358, 348747, 315371, 315408, H04N 3233, H04N 3237

Patent

active

055304885

ABSTRACT:
In a television receiver, having the ability to display differing image formats, the image width is capable of being continuously adjustable in the manner of a zoom effect. The ability to continuously adjust the image width is accomplished without any perceptible effect on the horizontal scan output. In that circuit, a tangent capacitor is coupled to a second capacitor with a switch being connected for switching the second capacitor into and out of the circuit. The switch is closed for an adjustable period beginning at the line center.

REFERENCES:
patent: 4028726 (1977-06-01), Argy
patent: 4956585 (1990-09-01), Rilly

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