Beam scan velocity modulation apparatus with disabling circuit

Details Beam scan velocity modulation apparatus with disabling circuit Beam scan velocity modulation apparatus with disabling circuit

1990-08-02

1991-12-10

Peng, John K.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358 37, 358 64, 358 67, 358166, H04N 568, H04N 964, H04N 924, H04N 5208

Patent

active

050723006

ABSTRACT:
In a television receiver, employing both a beam scan velocity modulation (SVM) system and an on screen display (OSD) generator, the OSD generator selectively operates to produce characters or graphics which are superimposed on the main video picture display. During operation of the OSD generator, the SVM circuit may tend to undesirably introduce artifacts into the picture display. Circuitry is provided for selectively disabling normal SVM circuit operation during OSD operation to prevent or reduce the perception of such artifacts.

REFERENCES:
patent: 3893165 (1975-07-01), Sunstein
patent: 4080628 (1978-03-01), Tirka
patent: 4170785 (1979-10-01), Yoshida et al.
patent: 4183064 (1980-01-01), Sahara et al.
patent: 4185301 (1980-01-01), Mitsuda et al.
patent: 4251832 (1981-02-01), Isono
patent: 4261014 (1981-04-01), Lee
patent: 4309725 (1982-01-01), Groeneweg
patent: 4641195 (1987-02-01), Inoue
Schematic of SVM Circuitry for Toshiba Color Television Receiver Model No. 30ID1, Published in the Magazine "Gijutsu", Oct. 1988 Issue p. 301.
Article from "Best of the Expander, vol. II", entitled "Scan Velocity Modulation--Making it Crisp Around the Edges!", 1988, pp. 74-79.

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