Noise immune pure carrier detector circuit

Claim 2

In a remote controlled apparatus, a system comprising: means for providing a signal output in response to remotely generated signals; control means for controlling functions of said apparatus coupled to said signal providing means; a detector circuit for determining the presence of amplitude variations of the output signals from said signal providing means; and disabling means, coupled to said detector circuit, for preventing output signals from said signal providing means from being applied to said control means such that the control of said apparatus functions is prevented when amplitude variations of said output signals are detected.

Claim 3

A system as defined in claim 1 wherein said disabling means includes a three terminal device having a first and second terminal coupled between said signal providing means and a point of reference potential, and a control terminal for controlling the conductivity of said first-second terminal current path coupled to said detector circuit.

Claim 4

A system as defined in claim 2 wherein said detector circuit includes a diode coupled between said signal providing means and said control terminal.

Claim 5

A system as defined in claim 3 including frequency dependent impedance means coupled to said diode for preventing high frequency signals from passing through said diode.

Claim 6

A system as defined in claim 2 wherein said disabling means includes a capacitor coupled between said first terminal and a point of fixed reference potential.

Claim 7

A system as defined in claim 5 wherein said disabling means includes a resistor and a diode connected in serieS and coupled between said signal providing means and said three terminal device.

Claim 8

A system as defined in claim 6 wherein said three terminal device is a transistor.

Claim 9

In a remote controlled apparatus, a system comprising: amplifier means for providing a signal output in response to remotely generated signals; control means for controlling functions of said apparatus; a transformer having a primary winding and a secondary winding, said secondary winding coupled to said control means; a first resistor coupled between one end of said primary winding and a source of operating potential, the other end of said primary winding coupled to said amplifier means; a control device having a first electrode, a second electrode, and a control electrode, said control device second electrode coupled to a point of reference potential; a first capacitor coupled between said first electrode and said point of reference potential; a second resistor and a first diode connected in series and coupled between said one end of said transformer and said first electrode; and a second diode coupled between said first resistor and said control electrode.

Claim 10

In a remote controlled apparatus, a system comprising: amplifier means for providing a signal output in response to remotely generated signals; control means for controlling functions of said apparatus; a transformer having a primary winding and a secondary winding, said secondary winding coupled to said control means; a first resistor coupled between one end of said primary winding and a source of operating potential, the other end of said primary winding coupled to said amplifier means; a control device having a first electrode, a second electrode, and a control electrode, said control device second electrode coupled to a point of reference potential; a first capacitor coupled between said first electrode and said point of reference potential; a second resistor and a first diode connected in series and coupled between said one end of said transformer and said first electrode; and a second diode coupled between said first resistor and said control electrode.

Claim 11

A system as defined in claim 8 including a second capacitor coupled between said control electrode and said point of reference potential.

Claim 12

A system as defined in claim 9 including a third capacitor coupled between said first resistor and said fixed point of reference potential.

Claim 13

In a remote controlled apparatus, a system comprising: amplifier means for providing a signal output in response to remotely generated signals; control means for controlling functions of said apparatus; a transformer having a primary and a secondary winding, said primary winding coupled to said amplifier means and said secondary winding coupled to said control means; means providing a shunt current path across the primary winding of said transformer, said path including a switching device switchable between high and low impedance conditions; and a detector circuit for determining the presence of amplitude variation in the signal output from said amplifier means, said detector circuit coupled to said switching device to cause said device to be switched to the low impedance condition when said detector circuit determines the presence of amplitude variations.

Claim 14

In a remote controlled apparatus, a system comprising: amplifier means for providing a signal output in response to remotely generated signals; control means for controlling functions of said apparatus; a transformer having a primary and a secondary winding, said primary winding coupled to said amplifier means and said secondary winding coupled to said control means; means providing a shunt current path across the primary winding of said transformer, said path including a switching device switchable between high and low impedance conditions; and a detector circuit for determining the presence of amplitude variation in the signal output from said amplifier means, said detector circuit coupled to said switching device to cause said device to be switched to the low impedance condition when said detector circuit determines the presence of amplitude variations.

Claim 15

A system as defined in claim 11 wherein said device is a bipolar transistor having a collector, an emitter and a base electrode, said transistor collector-emitter electrode current path forming a portion of said shunt current path and said transistor base electrode coupled to said detector circuit.

Claim 16

A system as defined in claim 12 including a diode connected in series with said transistor collector-emitter electrode current path.

Claim 17

A system as defined in claim 13 wherein said detector circuit includes a first and a second diode connected in series and coupled between the base electrode of said transistor and one end of the primary winding of said transformer.

Claim 18

A system as defined in claim 14 wherein said detector circuit further includes a first capacitor connected in parallel with said second diode and a second capacitor connected between the junction of said first and said second diodes and a point of fixed reference potential.

Claim 19

A system as defined in claim 15 wherein the primary winding of said transformer is coupled to said amplifier means at the winding end remote from said one end.

Claim 20

A system as defined in claim 16 including a resistor connected between said one end of the primary winding of said transformer and a source of operating potential for said amplifier means.

Claim 21

A system as defined in claim 17, including a capacitor connected between the junction on said resistor and said one end of the primary winding of said transformer and said point of fixed reference potential.

Claim 22

A system as defined in claim 18 including a resistor connected in series with the base electrode of said tRansistor to limit current flow through the base electrode.