Frequency shift signaling system with auxiliary control of pulse regenerator in the absence of data signals

Claim 1

IN A TRANSMISSION SYSTEM OF THE TYPE COMPRISING A TRANSMITTER HAVING A SOURCE OF CODED SIGNALS IN THE FORM OF MARK AND SPACE ELEMENTS, A SOURCE OF OSCILLATIONS, A SOURCE OF CONTINUOUS TIMING SIGNALS, MEANS FOR FREQUENCY MODULATING SAID OSCILLATIONS WITH SAID MARK AND SPACE ELEMENTS IN SYNCHRONISM WITH SAID TIMING SIGNALS, WHEREBY SAID OSCILLATIONS HAVE A CONSTANT FREQUENCY IN THE ABSENCE OF SAID CODED SIGNALS, AND MEANS FOR TRANSMITTING SAID FREQUENCY MODULATED OSCILLATIONS, AND A RECEIVER FOR RECEIVING SAID SIGNALS COMPRISING FREQUENCY DEMODULATING MEANS, TIME SIGNAL GENERATING MEANS CONNECTED TO SAID DEMODULATING MEANS FOR GENERATING TIME SIGNALS IN RESPONSE TO TRANSITIONS BETWEEN MARK AND SPACE ELEMENTS IN THE SIGNAL OUTPUT OF SAID DEMODULATING MEANS, AND PULSE REGENERATING MEANS CONNECTED TO SAID DEMODULATING MEANS FOR REGENERATING SAID MARK AND SPACE ELEMENTS AT INSTANTS DETERMINED BY SAID TIME SIGNALS; MEANS FOR CONTROLLING THE PHASE OF SAID TIME SIGNALS IN THE ABSENCE OF TRANSMISSION OF SAID CODED SIGNALS, SAID MEANS FOR CONTROLLING SAID PHASE COMPRISING MEANS AT SAID TRANSMITTER CONNECTED TO SAID SOURCE OF TIMING SIGNALS FOR GENERATING AN AUXILIARY SIGNAL, MEANS AT SAID TRANSMITTER RESPONSIVE TO THE ABSENCE OF SAID CODED SIGNALS FOR AMPLITUDE MODULATING SAID CONSTANT FREQUENCY OSCILLATIONS WITH SAID AUXILIARY SIGNALS, MEANS AT SAID RECEIVER FOR AMPLITUDE DETECTING SAID RECEIVED SIGNALS, AND MEANS AT SAID RECEIVER RESPONSIVE TO THE ABSENCE OF DEMODULATION OF SUCCESSIVE MARK AND SPACE ELEMENTS BY SAID DEMODULATING MEANS FOR APPLYING THE OUTPUT OF SAID AMPLITUDE DETECTING MEANS TO SAID TIME SIGNAL GENERATING MEANS.