Multiple reuse of an fm band

Details Multiple reuse of an fm band Multiple reuse of an fm band

H - Electricity

03

D

325/87

H03D 3/24 (2006.01)

Patent

CA 1332961

A signal receiving system for receiving messages from each of several unequal amplitude FM carriers occupying the same portion of the frequency band. The capture effect associated with conven- tional frequency demodulators is utilized in a series of succes- sively coupled phase lock loops to provide demodulation of all of several FM carrier signals including weaker carrier signals in the presence of dominant carrier signals. A phase lock loop demodula- tor provides a demodulated signal representing the information contained in the most dominant carrier signal input to the phase lock loop. The phase lock loop also provides a replica signal which is identified to the most dominant carrier signal input. The input signal is also delayed in a delay circuit and input into an input port of an output circuit. The replica signal is also coupled to an input port of the output circuit. The output circuit produces an output signal which is identical to the input signal except that the most dominant carrier signal is suppressed. The output signal is then coupled to a successive phase lock loop and delay circuit.

608300

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