Signal switching output device

Details Signal switching output device Signal switching output device

1991-06-04

1993-01-05

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 22, H04N 5262

Patent

active

051776120

ABSTRACT:
The signal switching ouput device comprises an attenuator which attenuates a brightness of an input image signal, a first switching means which alternatively outputs an output from said attenuator or said input image signal, delay circuits which delay a character signal by a specified time, a second switch which alternatively provides an output from said first switch and a character signal delayer by the specified time, and an switch instructing means which switches between said first switch and said second switch according to said character signal, and outputs an RGB signal showing a character while delaying it and lowers a brightness level of input image signals composing a background image during a specified period before and after the output of the RGB signal, so that a character displayed on a display unit is trimmed by a dark lines and are very easy to recognize.

REFERENCES:
patent: 3936868 (1976-02-01), Thorpe
patent: 4218698 (1980-08-01), Bart et al.
patent: 4392156 (1983-07-01), Duca et al.
patent: 4432016 (1984-02-01), Shanley, II et al.
"NHK", A Device for Superimposing Letters on a TV Screen ABU Technical Review (Japan) No. 23 pp. 13-15 Nov. 1972 358-183.

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