Telegraphy – Systems – Simplex-reversing periodic
Patent
1975-03-03
1976-03-16
Britton, Howard W.
Telegraphy
Systems
Simplex-reversing periodic
178DIG6, H04N 522
Patent
active
039447316
ABSTRACT:
A digital special effects generator combines two or more video signals under the control of a control lever or programmable hardware. Forward and reverse horizontal, vertical and corner wipes as well as a QUAD effect where four video signals may be simultaneously displayed are among the effects obtainable. An improved analog-to-digital converter is utilized to generate a digital signal representative of the position of the control lever, and a digital quantizer is used in conjunction with the analog-to-digital converter to eliminate jitter in the digital signal. The transition between video signals is controlled by comparing the digital lever position representative signal with a digital signal representative of the scanning beam position, and providing a video transition signal when a predetermined relationship between the two digital signals is reached. Border video switching circuitry utilizing a digital counter to control border width is used to generate a variable width, variable pattern border between the video displays.
REFERENCES:
patent: 3758712 (1973-09-01), Hudson
patent: 3780223 (1973-12-01), Perry
Britton Howard W.
Sarkes Tarzian, Inc.
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