Multiple reuse of an FM band

Claim 2

A signal receiving system for receiving an input signal having a plurality of modulated carrier signals included therein, said system comprising: first phase lock loop means for receiving said input signal, said first phase lock loop means for generating a first signal representing the demodulated message of the most dominant carrier signal of said input signal and for generating a first replica signal of said most dominant carrier signal; delay means coupled to said first phase lock loop means for receiving said input signal, said delay means for producing a delayed signal identical to said input signal, said delayed signal being selectively delayed with respect to said input signal; output means coupled to said delay means and to said first phase lock loop means for receiving and combining said delayed signal produced by said delay means and said replica signal generated by said first phase lock loop means, said output means for producing an output signal representing said input signal for said most dominant carrier signal suppressed; and second phase lock loop means coupled to said output means for receiving said output signal produced thereby and for generating a second signal representing the demodulated message of the second most dominant carrier signal of said input signal and for producing a second replica signal of said second most dominant carrier signal.

Claim 3

The signal receiving system as in claim 1 wherein said first phase lock loop means comprises: mixer means having first and second input ports, said input signal coupled to said first input port and said first replica signal coupled to said second input port, said mixer means combining said input signal and said replica signal for producing signals representing the sum and the difference of said input and first replica signals; low pass filter means coupled to said mixer means for receiving and filtering said signals produced by said mixer means for producing said first signal representing said demodulated message of said most dominant carrier signal; oscillator means coupled to said low pass filter means for generating a signal having a frequency substantially equal to the frequency of said most dominant carrier signal, said oscillator means responsive to said first signal for modulating said signal for producing said first replica signal of said most dominant carrier signal.

Claim 4

The signal receiving system as in claim 2 wherein said oscillator means comprises a voltage controlled oscillator.

Claim 5

The signal receiving system as in claim 2 wherein said second phase lock loop means comprises substantially identical components as said first phase lock loop means, said second phase lock loop means being tuned to lock at the frequency of said second most dominant carrier signal.

Claim 6

The signal receiving means as in claim 1 wherein said delay means comprises a plurality of amplifier stages, each said amplifier stage providing selectable continuously variable phase change over a predetermined range.

Claim 7

The signal receiving means as in claim 2 wherein said output means comprises a variable gain differential amplifier having a first input port coupled to said delay means for receiving said delayed signal and a second input port coupled to said first phase lock loop means for receiving said first replica signal, said differential amplifier combining said delayed signal and said first replica signal for producing said output signal, said output signal representing said input signal with said most dominant carrier signal suppressed.

Claim 8

Apparatus as in claim 1 wherein said first replica signal is given by the relation: ##EQU3## where ω 1 is the carrier frequency in radians/sec and m 1 (a) is the modulation component of said replica signal.

Claim 9

Apparatus as in claim 7 wherein said first signal is m 1 (t).

Claim 10

Apparatus for recovering information from an input signal having a plurality of modulated carrier signals, said apparatus comprising; a plurality of successive phase lock loop means for generating a plurality of first signals representing the demodulated message of the most dominant carrier signal received by each of said plurality of successive phase lock loop means and for generating a plurality of replica signals representative of said most dominant carrier signal received; a plurality of output means, each of said output means coupled between an immediately preceding phase lock lop means and a next successive phase lock loop means and having first and second input ports, said first input port coupled to said immediately preceding phase lock loop means, and each of said output means having an output port coupled to said next successive phase lock loop means; and a plurality of delay means, a first one of said delay means coupled to said second input port of a first one of said output means for receiving said input signal and producing a delayed signal identical to said input signal and being selectively delayed with respect to said input signal, a different one of the remaining delay means coupled between said output port of an immediately preceding output means for receiving output signals therefrom and said second input port of a next successive output means, said plurality of delay means for producing delayed signals identical to said received output signals and being selectively delayed with respect to said received output signals; each of said plurality of output means for receiving and combining said replica signal and said delayed signal and for producing said output signal, said output signal having the immediately preceding most dominant carrier signal suppressed, said output signal constituting the input signal for the next successive phase lock loop means and the next successive delay means.

Claim 11

Apparatus for recovering information from an input signal having a plurality of modulated carrier signals, said apparatus comprising; a plurality of successive phase lock loop means for generating a plurality of first signals representing the demodulated message of the most dominant carrier signal received by each of said plurality of successive phase lock loop means and for generating a plurality of replica signals representative of said most dominant carrier signal received; a plurality of output means, each of said output means coupled between an immediately preceding phase lock lop means and a next successive phase lock loop means and having first and second input ports, said first input port coupled to said immediately preceding phase lock loop means, and each of said output means having an output port coupled to said next successive phase lock loop means; and a plurality of delay means, a first one of said delay means coupled to said second input port of a first one of said output means for receiving said input signal and producing a delayed signal identical to said input signal and being selectively delayed with respect to said input signal, a different one of the remaining delay means coupled between said output port of an immediately preceding output means for receiving output signals therefrom and said second input port of a next successive output means, said plurality of delay means for producing delayed signals identical to said received output signals and being selectively delayed with respect to said received output signals; each of said plurality of output means for receiving and combining said replica signal and said delayed signal and for producing said output signal, said output signal having the immediately preceding most dominant carrier signal suppressed, said output signal constituting the input signal for the next successive phase lock loop means and the next successive delay means.

Claim 12

Apparatus as in claim 9 wherein each of said phase lock loop means comprise: mixer means having first and second input ports, said input signal coupled to said first input port and said replica signal coupled to said second input port, said mixer means combining said input and said replica signals for producing signals representing the sum and difference of said input and said replica signals; filter means coupled to said mixer means for receiving and filtering said signals produced by said mixer means and for producing said first signal representing the demodulated message of the most dominant carrier signal received by said phase lock loop means; and oscillator means coupled to said filter means and to said second input port of said mixer means, said oscillator means for generating a signal having the frequency of said most dominant carrier signal received by said phase lock loop means, said oscillator means responsive to said first signal to modulate said signal for producing said replica signal of said most dominant carrier signal received by said phase lock loop means.

Claim 13

Apparatus as in claim 10 wherein said oscillator means comprises a voltage controlled oscillator.

Claim 14

Apparatus for receiving a plurality of power division multiplexed, modulated carrier signals, said apparatus comprising: a plurality of demodulator means for producing a plurality of first signals, each of said first signals representing the demodulated message of the most dominant carrier signal received by each of said plurality of demodulator means, and for producing a plurality of replica signals, each of said replica signals representative of said most dominant carrier signals; and a plurality of output means being coupled to respective ones of said demodulator means for receiving and combining said first signals and said replica signals produced thereby, and for producing a plurality of output signals, each of said output signals having the next successively dominant carrier signal of said input signal suppressed.

Claim 15

Apparatus for receiving a plurality of power division multiplexed, modulated carrier signals, said apparatus comprising: a plurality of demodulator means for producing a plurality of first signals, each of said first signals representing the demodulated message of the most dominant carrier signal received by each of said plurality of demodulator means, and for producing a plurality of replica signals, each of said replica signals representative of said most dominant carrier signals; and a plurality of output means being coupled to respective ones of said demodulator means for receiving and combining said first signals and said replica signals produced thereby, and for producing a plurality of output signals, each of said output signals having the next successively dominant carrier signal of said input signal suppressed.

Claim 16

Apparatus for receiving an input signal having a plurality of power division multiplexed modulated carrier signals included therein, said system comprising: first demodulator means for receiving the input signal and for producing a signal representing the demodulated message of the most dominant carrier signal of said input signal, and for producing a replica signal of said dominant carrier signal; delay means coupled to the demodulator means for receiving the input signal, and for producing a first signal identical to said input signal except that said first signal is selectively delayed with respect to said input signal; output means, coupled to the delay means and to the demodulator means, for receiving and combining said first signal produced by said delay means and said replica signal produced by said demodulator means, and for producing an output signal representing the input signal with the most dominant carrier suppressed; and second demodulator means coupled to said output means for receiving the output signal produced thereby, for producing a signal representing the demodulated message of the second most dominant carrier of said input signal, and for producing a replica signal of said second most dominant carrier signal.

Claim 17

Apparatus for receiving an input signal having a plurality of power division multiplexed modulated carrier signals included therein, said system comprising: first demodulator means for receiving the input signal and for producing a signal representing the demodulated message of the most dominant carrier signal of said input signal, and for producing a replica signal of said dominant carrier signal; delay means coupled to the demodulator means for receiving the input signal, and for producing a first signal identical to said input signal except that said first signal is selectively delayed with respect to said input signal; output means, coupled to the delay means and to the demodulator means, for receiving and combining said first signal produced by said delay means and said replica signal produced by said demodulator means, and for producing an output signal representing the input signal with the most dominant carrier suppressed; and second demodulator means coupled to said output means for receiving the output signal produced thereby, for producing a signal representing the demodulated message of the second most dominant carrier of said input signal, and for producing a replica signal of said second most dominant carrier signal.

Claim 18

Apparatus as in claim 13 further including: a plurality of demodulator means each for producing a signal representing the demodulated message of the next successively dominant carrier signal in said input signals, and for producing a replica signal of said next successively dominant signals; a plurality of output means; and a plurality of delay means having an input each respectively coupled to the output of one of said output means for producing first signals identical to signals received therefrom selectively delayed with respect to said received signals; each of said plurality of output means being coupled to one of said demodulator means and one of said delay means for receiving and combining said first and said replica signals produced thereby, and for producing a plurality of output signals having the next successively dominant carrier signal of said input signal suppressed.

Claim 23

The method as in claim 16 further including the steps of: producing a plurality of signals representing the demodulated message of the next successively dominant carrier signal in said input signal; producing a plurality of replicas of the next successively dominant carrier signals; producing a plurality of first signals identical to said input signal with the immediately preceding dominant signals suppressed, said first signals being selectively delayed with respect thereto; and combining said pluralities of replica and first signals to produce a plurality of output signals, each of said output signals having the next successively dominant carrier signal of said input signal suppressed.