Television special effects circuit for wiping video signals

Details Television special effects circuit for wiping video signals Television special effects circuit for wiping video signals

1981-01-26

1983-07-26

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 22, H04N 521

Patent

active

043957331

ABSTRACT:
A method of wiping from one television video source to another encompasses the steps of mixing the color burst information during each horizontal blanking interval while wiping the video information carrying portion of each horizontal scan interval from one source to another. A special effects circuit for accomplishing this method includes a pair of variable gain linear amplifiers each having an input terminal coupled to a respective source of video signals to be wiped, and a circuit for providing a wipe control signal applied to the input of the amplifiers to control the gain of the amplifiers during the horizontal blanking interval in proportion to the percentage of wiping taking place, and control the variable gain amplifiers during the remaining portion of each horizontal scanning interval to apply either video from one or the other video sources. As signals from one video source are progressively wiped onto the raster, the proportionate mixing of the color burst signals progressively changes in direct proportion to the proportion of each video being displayed during the wiping process.

REFERENCES:
patent: 2964589 (1960-12-01), Walker
patent: 3392231 (1968-07-01), Schonfelder
patent: 3549793 (1970-12-01), Ross
patent: 4003078 (1977-01-01), Owen

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