Video switching apparatus having interference prevention feature

Details Video switching apparatus having interference prevention feature Video switching apparatus having interference prevention feature

1987-12-22

1989-01-31

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 31, 358181, 358188, H04N 978, H04N 964

Patent

active

048020001

ABSTRACT:
A Y/C selector switch is coupled to receive a first pair of internally-separated component signals Y.sub.1, C.sub.1 in addition to a second and a third pair of externally-supplied wideband component signals Y.sub.2, C.sub.2 and Y.sub.3, C.sub.3. The switch selects one of the pairs of input signals for application to its output terminals in response to a control signal. Means are provided for disabling the circuitry employed for generating the internally-separated component signals Y.sub.1, C.sub.1 when the Y/C switch is conditioned to apply a pair of externally-supplied component signals.

REFERENCES:
patent: 4139865 (1979-02-01), Iida et al.
patent: 4460918 (1984-07-01), Flasza
patent: 4660073 (1987-04-01), Baumeister
U.S. Patent Application, Ser. No. 066,671 (McNeely et al) entitled "Adaptive Y/C Separation Apparatus for TV Signals".

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