Video signal selection circuit

Details Video signal selection circuit Video signal selection circuit

1994-11-30

1996-11-05

Peng, John K.

Television

Image signal processing circuitry specific to television

Switching

348706, 348722, H04N 5268

Patent

active

055722636

ABSTRACT:
A video signal selection circuit capable of reading automatically the connection state of a plurality of video jack ports and selecting only modes corresponding to video ports which presently have a jack connected thereto. This video signal selection circuit includes a predetermined number of video jack ports, a predetermined number of switches respectively connected to the video jack ports and turned on when a corresponding jack is connected to the video jack port, and a micro-processor which registers the fact that the jack is connected to the video jack port by checking whether the corresponding switch is turned on. The micro-processor outputs a control signal so that the selection circuit selects only those ports to which jacks are connected when a mode conversion key is actuated. A switching portion is controlled by the micro-processor's control signal and selects for output only those video signal sources corresponding to the control signals received from the micro-processor.

REFERENCES:
patent: 3894177 (1975-07-01), Howell
patent: 4647973 (1987-03-01), Deiss
patent: 4764812 (1988-08-01), Hamley
patent: 4907085 (1990-03-01), Bingham
patent: 5117225 (1992-05-01), Wang
patent: 5305105 (1994-04-01), Heo
patent: 5434628 (1995-07-01), Spiero et al.

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