Interrupting a transition sequence between video sources

Details Interrupting a transition sequence between video sources Interrupting a transition sequence between video sources

1988-04-06

1989-12-26

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358185, H04N 974

Patent

active

048901636

ABSTRACT:
A transition interrupt for a video switcher which occurs at any point during or just prior to a transition between a program bus source and a preset bus source replaces the source on the preset bus with a new source. The program bus executes a cut or fade to black of the current source, and then the new source from the preset bus is switched to the program bus so that the new source is now on the program bus at black. The program bus is held at black, if necessary, until any necessary initial activation sequence is completed, such as preroll for a tape or cassette recorder, and then brought up from black to complete the new transition due to the transition interrupt.

REFERENCES:
patent: 4835613 (1989-05-01), Johnson
Operators Handbook of Model 100 Video Switcher, Grass Valley Group, 1983.

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