Method and system for creating a geometric figure at a selected

Details Method and system for creating a geometric figure at a selected Method and system for creating a geometric figure at a selected

1979-12-04

1981-09-01

Murray, Richard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 522

Patent

active

042875340

ABSTRACT:
Method and apparatus for creating control signals which, when applied to a special effects mixer determine the shape and position of a geometric figure during a wipe transition. The control signals are formed by a combination of input signals synchronized to either the horizontal or vertical synchronization frequency and having amplitudes which vary as a predetermined function of time. A DC voltage having an amplitude corresponding to the setting of a potentiometer or variable resistor is inserted into at least one of the input signals and is preserved when the one input signal, such as a sawtooth signal is processed (squared) to create a second input signal (parabolic signal). The position of the figure on the screen changes with changing amplitude of the so-inserted DC voltage.

REFERENCES:
patent: 4121253 (1978-10-01), McCoy

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