Special effect device for electronically accomplishing a gradual

Details Special effect device for electronically accomplishing a gradual Special effect device for electronically accomplishing a gradual

1979-05-11

1980-08-19

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 522

Patent

active

042187117

ABSTRACT:
In an electronic special video effect device, first and second digital video signals (D.sub.F and D.sub.S) derived during a keying interval of time from two television signals (VA and VB) between the beginning and a switching instant of each predetermined period and between the switching instant and the end of the period, respectively, are written in a memory (35) in addresses corresponding to the respective periods starting at an initial address corresponding to the switching instant. Each period may be a horizontal or a vertical scanning period. The memory addresses are merely cyclically read out to provide an output signal (VD) that enables a scene represented by one of the television signals to be pushed away from a television screen by another scene represented by the other, leftwards, rightwards, downwards, or upwards. Read-out may be started at the initial address with write-in carried out merely cyclically. Both may start at the initial address.

REFERENCES:
patent: 3821468 (1974-06-01), Busch
patent: 4101930 (1978-07-01), Sanders et al.

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