Multiplex magnetic recording and reproducing system

Claim 1

A MULTIPLEX MAGNETIC RECORDING AND REPRODUCING SYSTEM COMPRISING A REFERENCE SIGNAL SOURCE, THREE INPUT SIGNAL CIRCUITS, TWO PULSE-PHASE MODULATION CIRCUITS COUPLED TO SAID REFERENCE SIGNAL SOURCE AND TO TWO OF SAID THREE INPUT SIGNAL CIRCUITS TO PRODUCE TWO PULSE SIGNALS SHIFTED IN PHASE IN RELATION TO THE REFERENCE SIGNAL IN ACCORDANCE WITH THE AMPLITUDE OF THE SIGNALS FROM SAID TWO OF SAID THREE INPUT SIGNAL CIRCUITS, A COMMON FLIP-FLOP CIRCUIT RESPONSIVE TO SAID TWO PULSE SIGNALS TO BE TRIGGERED THEREBY AND TO PRODUCE A FIRST SQUAREWAVE SIGNAL HAVING LEADING AND TRAILING EDGES RESPECTIVELY CONTROLLED IN PHASE BY SAID PULSE SIGNALS, MEANS INCLUDING A FIRST MAGNETIC HEAD FOR RECORDING SAID SQUAREWAVE SIGNAL ON A MAGNETIC MEDIUM, A PULSE WIDTH MODULATION CIRCUIT COUPLED TO SAID REFERENCE SIGNAL SOURCE AND TO THE OTHER INPUT SIGNAL CIRCUIT FOR PRODUCING A SECOND SQUAREWAVE IN WHICH ONE EDGE THEREOF IS SHIFTED IN PHASE IN ACCORDANCE WITH THE AMPLITUDE OF THE SIGNAL FROM SAID OTHER INPUT SIGNAL CIRCUIT, MEANS INCLUDING A SECOND MAGNETIC HEAD FOR RECORDING SAID SECOND SQUAREWAVE ON SAID MAGNETIC MEDIUM, MEANS INCLUDING A FIRST REPRODUCING MAGNETIC HEAD FOR REPRODUCING SAID FIRST SQUAREWAVE SIGNAL, MEANS INCLUDING A SECOND REPRODUCING MAGNETIC HEAD FOR REPRODUCING SAID