Video switcher with preview system

Details Video switcher with preview system Video switcher with preview system

1990-12-26

1992-11-24

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358181, 358 22, H04N 2262, H04N 974

Patent

active

051667975

ABSTRACT:
A video production switcher comprises a background mixer, a program bus for connecting a selected video source to the program input of the background mixer, and a downstream key mixer and a preview mixer each having a background input and a key fill input. The key fill inputs of the downstream key mixer and the preview mixer are each connected to receive the same key fill video signal. Each of the latter mixers combines the signal present at its background input with the signal present at its key fill input in dependence on the signal present at its control input. A preview selector connects the background input of the preview mixer selectively either to a second video source, or to the program bus, or to a third video source, and a key control switch connects the transition control input of the preview mixer selectively either to a reference potential level or to a key signal source.

REFERENCES:
patent: 4851912 (1989-07-01), Jackson et al.
patent: 4853784 (1989-08-01), Abt et al.
patent: 4947254 (1990-08-01), Abt et al.
patent: 4947256 (1990-08-01), Wood et al.

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