Circuit for synchronizing an on-screen display (OSD) on a pictur

Details Circuit for synchronizing an on-screen display (OSD) on a pictur Circuit for synchronizing an on-screen display (OSD) on a pictur

1993-03-25

1994-04-12

Kostak, Victor

Television

Image signal processing circuitry specific to television

Noise or undesired signal reduction

348578, 348553, H04N 5272

Patent

active

053030486

ABSTRACT:
In a television receiver, a source of super sandcastle pulse is connected via a horizontal sync signal extracting first circuit and the vertical sync signal extracting second circuit to the horizontal and vertical sync input terminals of an OSD processor. Advantageously, it has been found that such a super sandcastle pulse provides good and stable relationship between H and V so that flicker and jitter on the screen during OSD do not occur.

REFERENCES:
patent: 4291336 (1981-09-01), Shanley, II
patent: 4354202 (1982-10-01), Harlan
patent: 4475124 (1984-10-01), Ankeny et al.
patent: 4612577 (1986-09-01), Keen
Patent Abstract of Japan 40 54 772.
"Picture in Picture" by M. Bromba, et al., Siemens Components, vol. 25, No. 1, Mar. 1990, pp. 17-21.

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