Phase control of parabolic wave in special effects system

Details Phase control of parabolic wave in special effects system Phase control of parabolic wave in special effects system

1978-02-02

1980-01-08

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 522

Patent

active

041830610

ABSTRACT:
In a system for controlling the phase or peak portion of a continuous parabolic wave to move the center position of a circular or elliptical montage pattern on the picture screen of a television cathode ray tube, a fundamental parabolic wave with a fixed amplitude and phase and a sawtooth wave are generated at a constant repetition frequency (horizontal scanning frequency and vertical scanning frequency). At least the amplitude of the amplitude and polarity of the sawtooth wave is controlled in proportion to the position controlled variable of the montage pattern and then the sawtooth wave is mixed with the fundamental parabolic wave. A mixture of the horizontal parabolic and sawtooth waves is superposed on a mixture of the vertical parabolic and sawtooth waves, and then sliced to produce a montage pattern producing keying signal for combining two different video signals into one composite video signal.

REFERENCES:
patent: 3715487 (1973-02-01), Blake

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