Time division multiplex system with special application to magnetic recording

Claim 1

A MAGNETIC REPRODUCING SYSTEM COMPRISING A MAGNETIC REPRODUCING HEAD FOR COUPLING TO A RECORD MEDIUM HAVING A MULTIPLEX WAVEFROM RECORDED THEREON INCLUDING A SUCCESSION OF AMPLITUDE STEPS WHOSE TIMES OF OCCURRENCE ARE MODULATED IN ACCORDANCE WITH RESPECTIVE INPUT SIGNALS AND INCLUDING SYNCHRONIZING AMPLITUDE STEPS WITH CONSTANT TIME INTERVALS THEREBETWEEN SERVING AS SYNCHRONIZING SIGNALS, MEANS FOR DERIVING SAID SYNCHRONIZING AMPLITUDE STEPS FROM SAID MODULATED AMPLITUDE STEPS, THE EXTENT OF AMPLITUDE CHANGE IN THE AMPLITUDE STEPS SERVING AS SYNCHRONIZING SIGNALS BEING SUBSTANTIALLY GREATER THAN THE EXTENT OF AMPLITUDE CHANGE IN THE MODULATED AMPLITUDE STEPS WHICH HAVE THE SAME DIRECTION OF AMPLITUDE CHANGE AS THE SYNCHRONIZING AMPLITUDE STEPS, SAID MAGNETIC REPRODUCING HEAD PRODUCING AN ELECTRICAL OUTPUT PROPORTIONAL TO THE TIME RATE OF CHANGE OF SAID RECORDED WAVEFORM INCLUDING A SERIES OF SIGNAL PULSES MODULATED IN ACCORDANCE WITH THE RESPECTIVE INPUT SIGNALS AND A SERIES OF SYNCHRONIZING PULSES OF SUBSTANTIALLY GREATER AMPLITUDE THAN THE SIGNAL PULSES OF THE SAME POLARITY, AND MEANS FOR SEPARATING SAID SYNCHRONIZING PULSES FROM SAID SIGNAL PULSES AND FOR DEMODULATING SAID SIGNAL PULSES TO PROVIDE OUTPUT SIGNALS VARYING IN ACCORDANCE WITH THE RESPECTIVE INPUT SIGNALS REPRESENTED BY SAID RECORDED WAVEFORM.