Electronic video editor

Claim 1

An electronic video editor for switching any one of a pair of video input signals to a common output channel comprising: A. a pair of video input channels each having a video signal thereon; B. a single output channel; C. a switching circuit including a pair of gating means; D. each of said gating means including a pair of back to back diodes coupling a respective input channel to said output channel said channel including an emitter follower; E. an emitter follower coupled between each of said channels and said respective gate means coupled thereto; F. a voltage source; G. a balance circuit coupled between said voltage source and said emitter followers; H. said balance circuit including a variable resistor for maintaining the voltage applied to said emitter followers substantially equal; I. a pair of transistors each having a base, emitter, and collector electrode; J. means for connecting said collector electrode of a respective transistor between said back to back diodes of a respective gating means for deactivating said gating means when said respective transistor is turned on; K. a flip-flop having a pair of input terminals, a pair of output terminals and a trigger input; L. means for connecting including a zener diode each of said output terminals to a base electrode of a respective transistor for turning said respective transistors on when there is a signal present on the output terminal; M. a source of sync signals phase-locked to said video signals for providing a signal during the blanking portion of said video signal; N. a manually operable switch coupled to said input terminals of said flip-flop capable of being switched to select a desired state of said flip-flop wherein an output signal is on one or the other output terminals, and O. means for connecting said source of sync signals to said trigger terminal causing said flip-flop to change state responsive to said manually operable switch being switched from one state to another during the blanking portion of said video signal; P. whereby an operator can switch from one video channel to another and such switching operation only takes place during the blanking portion of said signal.