Apparatus for switching between two asynchronous video signals

Details Apparatus for switching between two asynchronous video signals Apparatus for switching between two asynchronous video signals

1991-05-31

1992-11-10

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358185, 358149, H04N 5268

Patent

active

051629038

ABSTRACT:
An apparatus for switching a video signal comprises a switch for switching a video signal from one to another, a memory for storing an output of the switch, a detector for detecting a switch signal, a switch control circuit for controlling the switch in response to the switch signal, and a memory control circuit for controlling writing and reading of the memory, wherein when the switch signal is detected, the memory control circuit continues to write one video signal until a sync. (synchronizing) signal of the one video signal is detected and after a predetermined period write another video signal when a sync. signal of the other video signal is detected.

REFERENCES:
patent: 4231063 (1979-05-01), Ito
patent: 4561020 (1985-12-01), Matsuda
patent: 4890162 (1989-12-01), McNeely
patent: 4994916 (1991-02-01), Pshtissky

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