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

1978-02-01

1980-01-22

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 522

Patent

active

041853008

ABSTRACT:
A system is disclosed which controls the phase or the peak position of a continuous parabolic wave to move the position of a circular or elliptic montage pattern on the screen of a television cathode ray tube. A fundamental parabolic wave whose amplitude and phase are fixed and a sawtooth wave are produced at a predetermined frequency (horizontal line- and vertical field-scanning frequency). A predetermined DC potential is inserted into the parabolic wave signal during a specific period of each cycle or a horizontal fly-back time. A DC potential proportional to a position control quantity of the montage pattern is inserted into the sawtooth wave signal during the specific period of each cycle thereof. Then, the sawtooth wave signal is controlled in its amplitude in proportion to the position control quantity and is mixed with the parabolic signal to produce a horizontal or vertical parabolic wave component. Before mixed with the parabolic wave, a potential of the sawtooth wave signal during the specific period thereof is clamped to a predetermined potential or a potential of the mixture of the parabolic wave and the sawtooth wave during the specific period of each cycle is clamped to a predetermined potential. A horizontal parabolic component and a vertical parabolic component are mixed together and then sliced to produce a keying signal for combining two video signals into a single composite video signal.

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

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