Tri-state sync technique

Details Tri-state sync technique Tri-state sync technique

1985-06-28

1988-02-02

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358149, H04N 504

Patent

active

047231645

ABSTRACT:
An apparatus and method is provided for transmitting both horizontal and vertical sync on a single transmission channel in a raster scan display system. Separate, essentially two-state horizontal and vertical sync signals are combined to form a tri-state combined sync signal. In one embodiment, horizontal sync and vertical sync signals are summed to provide a "summation" sync for transmission over a single channel. At a video display station, the vertical sync component is separated by integrating the summed sync signal. Likewise, the horizontal sync component is separated by differentiating the summation sync signal. Additionally, the horizontal sync may be clamped about a desired DC voltage level at the video display station. Horizontal sync information is maintained throughout vertical sync periods and the timing for the horizontal oscillator is preserved so that the horizontal lines immediately following the termination of the vertical sync period are in proper phase as the vertical trace period begins.

REFERENCES:
patent: 3261920 (1966-07-01), Aarron
patent: 3816658 (1974-06-01), Vidovic
patent: 3963877 (1976-06-01), Miyazaki et al.
patent: 4213149 (1980-07-01), Janko
patent: 4222074 (1980-09-01), Breithaupt
patent: 4524387 (1985-06-01), Tamer
"Television Engineering", by Arvind M. Dhake, Tata McGraw-Hill Publishing Co., 1980, pp. 321-323.

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