Rotary special effects generator

Details Rotary special effects generator Rotary special effects generator

1976-05-19

1978-03-28

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358182, H04N 577

Patent

active

RE0296007

ABSTRACT:
A special effects generator for use in video switching produces a wide variety of rotational wipes, fades, and special effects. The generator functions by mixing together controlled amounts of horizontal and vertical sawtooth waveforms and DC potentials. The resultant signal is then fed into a comparator, and the comparator output is used to control one or more electronic video switches. The special effects are controlled by varying the strengths of the waveforms which are summed through the use of potentiometers or variable resistors. Rotational special effects are achieved through the use of a 360 degree circular potentiometer having multiple taps. Provision is made for multiple image special effects. Also disclosed are circuits for preserving the integrity of the switch output signal during synchronizing intervals and for equalizing the DC levels of all the video signals which are mixed together.

REFERENCES:
patent: 2244239 (1941-06-01), Blumlein
patent: 3006993 (1961-10-01), Barndt
patent: 3371160 (1968-02-01), Hurford
Glasford, Fundamentals of Television Engineering, p. 505; McGraw-Hill Book Company, 1955.

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