Digital rotary special effects generator

Details Digital rotary special effects generator Digital rotary special effects generator

1973-03-23

1976-06-08

Britton, Howard W.

Telegraphy

Systems

Simplex-reversing periodic

178DIG6, H04n 522

Patent

active

039625362

ABSTRACT:
An improved special effects generator for television uses digital logic to achieve "windshield wiper," "propeller," and other similar rotational special effects. The generator is supplied with a number whose magnitude is proportional to the angular rotation of the desired special effect. Digital logic circuitry is used to compute the co-tangent of this number, to compute the product of this co-tangent with the Y-coordinate of each image point, and to compare the resulting product with the X-coordinate of each image point. The result of this comparison then signals whether each image point is derived from a first incoming video signal or from a second incoming video signal. Additional digital logic permits "fan" and "clock-hand" wipe effects to be achieved.

REFERENCES:
patent: 3598908 (1971-08-01), Poulett
patent: 3671667 (1972-06-01), Thorpe
patent: 3758712 (1973-09-01), Hudson

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