Scanning speed modulating circuit and method

Details Scanning speed modulating circuit and method Scanning speed modulating circuit and method

1996-06-14

1999-06-15

Hsia, Sherrie

Television

Image signal processing circuitry specific to television

Transition or edge sharpeners

348625, H04N 5208

Patent

active

059127155

ABSTRACT:
A method and apparatus for enhancing an edge in an image edge by controlling the electron beam scanning speed. A primary differential signal is delayed and the delayed and non-delayed signals are fed into a maximum value detection circuit and a minimum value detection circuit. A signal output by the maximum value detection signal, from which a positive alternating current component is removed, and a signal output by the minimum value detection circuit, from which a negative alternating current component is removed, are added together and synthesized. The resultant signal is passed through an amplifier circuit and then across a speed modulation coil of a cathode ray tube.

REFERENCES:
patent: 2851522 (1958-09-01), Hollywood
patent: 3752916 (1973-08-01), Lowry et al.
patent: 4261014 (1981-04-01), Lee
patent: 5196736 (1993-03-01), Doornhein et al.
patent: 5587745 (1996-12-01), Griepentrog et al.

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