Modulation conversion circuit for changing frequency modulation into pulse width modulation and omnirange receiver circuit utilizing such conversion circuit

Claim 2

BEARING DETERMINING CIRCUITS FOR AN OMNIRANGE RADIO RECEIVER, COMPRISING: PHASE SHIFTING MEANS TO VARY THE PHASE OF A LOW FREQUENCY INPUT BEARING SIGNAL TO SELECT A BEARING WITH RESPECT TO AN OMNIRANGE TRANSMITTER AND OBTAIN AN OUTPUT BEARING SIGNAL, MEANS FOR CONVERTING A HIGHER FREQUENCY INPUT REFERENCE SIGNAL WHICH IS FREQUENCY MODULATED WITH A LOW FREQUENCY REFERENCE SIGNAL HAVING THE SAME FREQUENCY AS THE INPUT BEARING SIGNAL INTO AN OUTPUT REFERENCE SIGNAL CONTAINING PULSES AT SAID HIGHER FREQUENCY WHICH ARE PULSE WIDTH MODULATED AT SAID LOW FREQUENCY, AND MEANS FOR COMBINING SAID PULSES OF SAID OUTPUT REFERENCE SIGNAL WITH SAID OUTPUT BEARING SIGNAL TO OBTAIN A PAIR OF INDICATOR SIGNALS HAVING RELATIVE VALUES DEPENDING UPON THE DIFFERENCES IN PHASE BETWEEN SAID OUTPUT BEARING SIGNAL AND THE PULSE WIDTH MODULATIONS OF SAID OUTPUT REFERENCE SIGNALS.

Claim 3

MODULATION CONVERSION MEANS COMPRISING: TRANSFORMER MEANS CONNECTED TO BE SUPPLIED WITH AN INPUT SIGNAL WHICH IS FREQUENCY MODULATED WITH A LOWER FREQUENCY SIGNAL AND PROVIDING A CONTROL SIGNAL IN QUADRATURE WITH SAID INPUT SIGNAL AT THE CENTRAL FREQUENCY OF SAID INPUT SIGNAL AND HAVING RELATIVE PHASE SHIFTS BETWEEN SAID CONTROL SIGNAL AND SAID INPUT REFERENCE SIGNAL IN OPPOSITE DIRECTIONS DURING ALTERNATE HALF CYCLES OF THE FREQUENCY MODULATION OF SAID INPUT SIGNAL. FIRST AND SECOND AMPLIFYING MEANS CONNECTED IN SERIES WITH EACH OTHER TO PROVIDE AN OUTPUT SIGNAL ONLY WHEN BOTH OF SAID AMPLIFYING DEVICES ARE CONDUCTING, SAID FIRST AMPLIFIYING MEANS BEING CONNECTED TO BE RENDERED CAPABLE OF CONDUCTING BY SAID INPUT SIGNAL DURING ALTERNATE HALF CYCLES ONLY OF SAID INPUT SIGNAL, AND SAID SECOND AMPLIFYING MEANS BEING CONNECTED TO BE RENDERED CAPABLE OF CONDUCTING BY SAID CONTROL SIGNAL DURING ALTERNATE HALF CYCLES ONLY OF SAID CONTROL SIGNAL TO THEREBY PROVIDE AN OUTPUT SIGNAL CONTAINING PULSES AT THE FREQUENCY OF SAID INPUT SIGNAL AND WHICH ARE PULSE WIDTH MODULATED AT THE FREQUENCY OF SAID LOWER FREQUENCY SIGNAL.

Claim 4

MODULATION CONVERSION MEANS COMPRISING: TRANSFORMER MEANS CONNECTED TO BE SUPPLIED WITH AN INPUT SIGNAL WHICH IS FREQUENCY MODULATED WITH A LOWER FREQUENCY SIGNAL AND PROVIDING A CONTROL SIGNAL IN QUADRATURE WITH SAID INPUT SIGNAL AT THE CENTRAL FREQUENCY OF SAID INPUT SIGNAL AND HAVING RELATIVE PHASE SHIFTS BETWEEN SAID CONTROL SIGNAL AND SAID INPUT REFERENCE SIGNAL IN OPPOSITE DIRECTIONS DURING ALTERNATE HALF CYCLES OF THE FREQUENCY MODULATION OF SAID INPUT SIGNAL. FIRST AND SECOND AMPLIFYING MEANS CONNECTED IN SERIES WITH EACH OTHER TO PROVIDE AN OUTPUT SIGNAL ONLY WHEN BOTH OF SAID AMPLIFYING DEVICES ARE CONDUCTING, SAID FIRST AMPLIFIYING MEANS BEING CONNECTED TO BE RENDERED CAPABLE OF CONDUCTING BY SAID INPUT SIGNAL DURING ALTERNATE HALF CYCLES ONLY OF SAID INPUT SIGNAL, AND SAID SECOND AMPLIFYING MEANS BEING CONNECTED TO BE RENDERED CAPABLE OF CONDUCTING BY SAID CONTROL SIGNAL DURING ALTERNATE HALF CYCLES ONLY OF SAID CONTROL SIGNAL TO THEREBY PROVIDE AN OUTPUT SIGNAL CONTAINING PULSES AT THE FREQUENCY OF SAID INPUT SIGNAL AND WHICH ARE PULSE WIDTH MODULATED AT THE FREQUENCY OF SAID LOWER FREQUENCY SIGNAL.