Video signal generator

Claim 1

In an apparatus for producing a fixed or antimated display on the cathode ray tube of a television receiver, said receiver constituting a portion of a display system including a receiver and a video adaptation circuit for converting applied signals to proper form for application to the receiver input terminals, the improvement comprising: first oscillator means providing a first plurality of periodic signals; first synchronizing means responsive to the receiver line scanning control signals, said first synchronizing means being coupled to said first oscillator means to produce line coherence of said first plurality of periodic signals; means providing a second plurality of periodic signals with line coherence; means providing a further periodic signal with receiver frame coherence; first matrix means having a plurality of input and output terminals, said periodic signals of said first and second plurality and said further periodic signal being applied to said first matrix means, said matrix means mixing said periodic signals to provide a plurality of output signals; a plurality of comparator means, said first matrix means output signals being applied as first inputs to individual of said comparator means; means providing a variable steady state reference voltage as a second input to each of said comparator means; means connected to the outputs of said comparator means for mixing the complex output signals provided thereby in response to comparison of the resistive matrix output signals and said variable reference voltages, said mixing means having a plurality of output terminals; and means applying signals presented at said mixing means output terminals to the adaptation circuit.