Television receiver with video changeover switch responsive to c

Details Television receiver with video changeover switch responsive to c Television receiver with video changeover switch responsive to c

1977-06-08

1979-02-13

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

17910011, 358191, 360 33, H04N 544

Patent

active

041398653

ABSTRACT:
A televison reciver for reproducing a picture selectively derived from a television signal or from an external video signal, including a television tuner having a variable reactance device as a tuning element, a video detector coupled to said television tuner and producing a television video signal at a television video signal output terminal, thereof a channel selector having a plurality of channel selecting switches for supplying a tuning voltage corresponding to a selected channel to the variable reactance device of said television tuner, an external video signal input terminal, a gate circuit operative to select a video signal either from said television video signal input terminal or from said external video signal input terminal, flip-flop circuit having first and second states for controlling said gate circuit, a switch for setting said flip-flop circuit to control the gate circuit to select an external video signal, and a reset circuit connected to said channel selecting switches for resetting said flip-flop circuit to control the gate circuit to select a television video signal.

REFERENCES:
patent: 3886307 (1975-05-01), Evans et al.
patent: 4031548 (1975-09-01), Kato et al.

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