Special effect device for electronically accomplishing a...

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

H - Electricity

04

N

350/53

H04N 5/275 (2006.01)

Patent

CA 1121907

Abstract of the Disclosure In an electronic special video effective device, first and second digital video signals (DF and DS) derived during a keying time interval 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 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.

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