Television scan rate conversion using magnetic record

Claim 1

APPARATUS FOR THE CONVERSION OF A FIRST TELEVISION SIGNAL HAVING A SPECIFIED NUMBER OF FRAMES PER SECOND TO A SECOND TELEVISION SIGNAL HAVING A DIFFERENT NUMBER OF FRAME PER SECOND, SAID APPARATUS COMPRISING: FIRST AND SECOND MAGNETIC TAPES; A RECORDING HEADS MOUNTED PRISING A PLURALITY OF MAGNETIC RECORDING HEADS MOUNTED TO ENGAGE EACH OF SAID TAPES IN SUCCESSION TO RECORD SAID FIRST TELEVISION SIGNAL THEREON; RECORDING DRIVE MEANS TRANSVERSING EACH SAID RECORDING HEAD OVER SAID TAPES AT A CONSTANT EACH SAID RECORDING HEAD OVER SAID TAPES AT A BOTH SAID TAPES PAST SAID ASSEMBLY AT THE SAME CONSTANT SPEED; A REPRODUCING ASSEMBLY COMPRISING A PLURALITY OF MAGNETIC READ-OUT HEADS MOUNTED TO ENGAGE EACH OF SAID TAPES IN SUCCESSION; REPRODUCING DRIVE MEANS TRAVERSING SAID READ-OUT HEADS OVER SAID TAPES AT A CONSTANT SPEED, REPRODUCING TAPE DRIVE MEANS TRAVERSING SAID TAPES PAST SAID REPRODUCING ASSEMBLY IN OPPOSITE ALTERNATING AT A FIRST SPEED SUCH THAT SAID DIFFERENT NUMBER OF FRAMES OF SAID RECORDED SIGNAL PASS SAID ASSEMBLY IN ONE UNIT OF TIME AND AT A SECOND SPEED SUCH THAT THE AVERAGE OVER A PERIOD OF THE NUMBER OF FRAMES PASSING SAID ASSEMBLY IN SAID UNIT OF TIME IS SAID SPECIFIED NUMBER; AND SWITCH MEANS OPERATING TO DERIVE AN OUTPUT SIGNAL FROM THOSE OF SAID READ-OUT HEADS WHICH AT ANY TIME ARE ENGAGED WITH THAT ONE OF SAID TAPES WHICH IS MOVING AT SAID FIRST SPEED.