Remote control circuit employing frequency/direct signal converters

A remote control circuit including a transmitting portion comprising:

• a first controllable oscillator having a control input, a first frequency/direct signal converter and a first comparator which are connected together into a frequency control loop, with said first converter being connected to receive an input signal having a frequency proportional to that produced by said oscillator, one input of said first comparator being connected to receive a signal proportional to that produced by said first converter, and said oscillator control input being connected to receive a signal proportional to that at the output of said first comparator;
• a transmitter connected to receive the output signal from said oscillator of the control loop;
• and means defining a control path including a frequency signal source and a second frequency/direct signal converter which receives its input signal from the frequency signal source, with said second converter having its output connected with the other input of said first comparator of the control circuit, and a receiving portion comprising:
• a second controllable oscillator having a control input, a third frequency/direct signal converter and a second comparator connected together into a frequency control loop, with said third converter being connected to receive an input signal having a frequency proportional to that produced by said second oscillator, one input of said second comparator being connected to receive a signal proportional to that produced by said third converter, and said second oscillator control input being connected to receive a signal proportional to that at the output of said second comparator;
• and means defining a second control path for controlling said receiving portion control loop and including an amplifier and a fourth frequency/direct signal converter connected in series with said amplifier and having an output connected with the other input of said second comparator.