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US 4,992,747 AGranted
Multiple reuse of an FM band
OwnerGlen A. Myersinventor
Life of this patent
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Abstract
A signal receiving system for receiving messages from each of several unequal amplitude FM carriers occupying the same portion of the frequency band. The signal receiving system receives power division multiplexed signals, each of which being allocated a portion of the total average power of an assigned FM band.
Claims17
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.
2 more elements
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.
2 more elements
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.
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.
2 more elements
A method for receiving a plurality of power division multiplexed, modulated carrier signals, said method comprising the steps of:
- producing a plurality of signals representing the demodulated message of the most dominant carrier signal received by each of a plurality of demodulator means;
- producing a plurality of replicas of said most dominant carrier signals;
- producing a plurality of first signals identical to said plurality of modulated carrier signals with the immediately preceding dominant carrier signal 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, coupled to one of said demodulator means and one of said delay means for receiving and combining 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.
2 more elements
A method for receiving an input signal having a plurality of power division multiplexed modulated carrier signals included therein, said method comprising the steps of:
- producing a signal representing the demodulated message of the most dominant carrier signal of said input signal;
- producing a replica signal of the most dominant carrier signal;
- producing a first signal identical to said input signal except that said first signal is selectively delayed with respect to said input signal;
- combining said replica and first signals to produce an output signal representing the input signal with the most dominant carrier suppressed;
- and
- producing a signal representing the demodulated message of the second most dominant carrier signal of said input signal.
3 more elements
Dependencies are inferred from the claim text.