Television broadcasting apparatus including monochromatic charac

Details Television broadcasting apparatus including monochromatic charac Television broadcasting apparatus including monochromatic charac

1991-01-24

1992-11-03

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 21R, H04N 968, H04N 5272

Patent

active

051610205

ABSTRACT:
An apparatus for transmitting an NTSC color signal superposed with a signal corresponding to monochromatic characters with a colored contour, which is obtained from a color character super device, comprises a first circuit responsive the NTSC signal from the color character super device to determine an area on a television receiver screen on which signal out of NTSC signal standard may be displayed, a second circuit for deriving chrominance signal spectrum out of NTSC standard and means for gating the chrominance signal spectrum with an output of the first circuit and then for subtracting the gated chrominance signal spectrum from the NTSC signal to thereby at least reduce signal component thereof out of the NTSC standard signal.

REFERENCES:
patent: 4558353 (1985-10-01), Hirota
patent: 4618882 (1986-10-01), Harwood et al.
patent: 5023721 (1991-06-01), Moon-Hwan
patent: 5032916 (1991-07-01), Matsuura et al.
T. Fukinuki, "Multi-Dimensional TV Signal Processing", pp. 174-176, published on Nov. 15, 1988 by Nikkan Kogyo Shimbun.
"Television, Image Engineering Handbook", p. 986 published on Dec. 30, 1980 by Ohm Co., Ltd.

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