Television standards conversion apparatus having temporarily increased line scanningspeeds

Claim 1

IN A TELEVISION STANDARDS CONVERSION APPARATUS INCLUDING AN INPUT SIGNAL REPRODUCER TUBE, MEANS FOR SUPPLYING A COMPOSITE SIGNAL WAVE INCLUDING A TELEVISION SIGNAL WAVE IN ACCORDANCE WITH INPUT STANDARDS AND A SUPERIMPOSED REFERENCE AMPLITUDE PULSE DURING THE BLANKING PERIOD OF SAID SIGNAL WAVE TO SAID TUBE FOR PRODUCING A USEFUL PICTURE WITH A REFERENCE STRIP JUST OUTSIDE ONE FRAME DIRECTION EDGE THEREOF, A TELEVISION CAMERA POSITIONED TO VIEW SAID PICTURE AND STRIP, OPERATED IN ACCORDANCE WITH OUTPUT STANDARDS, AND MEANS COUPLED TO SAID CAMERA AND CONTROLLED BY SIGNALS DUE TO THE VIEWING OF SAID REFERENCE STRIPE, FOR CONTROLLING THE AMPLITUDE OF VIDEO SIGNALS DERIVED FROM SAID CAMERA SO AS SUBSTANTIALLY TO REDUCE OR ELIMINATE FLICKER EFFECTS PRESENT IN THOSE SIGNALS DUE TO STANDARD DIFFERENCES AND PRIMARILY DUE TO DIFFERENCE OF FRAME FREQUENCY BETWEEN THE TWO STANDARDS, SAID APPARATUS COMPRISING MEANS FOR VARYING THE SPEED OF LINE DEFLECTION OF THE INPUT SIGNAL REPRODUCER TUBE DURING THE BLANKING PERIOD OF TH COMPOSITE SIGNAL WAVEFORM TO INCREASE THAT SPEED AFTER TERMINATION OF THE SUPERIMPOSED REFERENCE AMPLITUDE PULSE TO A SUBSTANTIALLY HIGHER VALUE THAN THAT OF THE SPEED BEFORE SUCH TERMINATION.