Overlaying information on a video display

Details Overlaying information on a video display Overlaying information on a video display

G - Physics

09

G

375/46

G09G 1/00 (2006.01) G09G 1/16 (2006.01) G09G 5/02 (2006.01)

Patent

CA 1240081

Abstract Of The Disclosure A normal video signal and an overlay video signal are combined by supplying the normal video signal to the base of a first emitter follower transistor while the overlay video signal is supplied to the base of a second emitter follower transistor. The two transistors are biased such that the first transistor is at a slightly lower voltage than the second (overlay) transistor and is reversed biased (off) any time data is available from the overlay video signal.

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