Controlling FPLL polarity using pilot signal and polarity invert

Details Controlling FPLL polarity using pilot signal and polarity invert Controlling FPLL polarity using pilot signal and polarity invert

1996-05-13

1997-09-16

Mis, David

Demodulators

Amplitude modulation demodulator

Input signal combined with local oscillator or carrier...

329308, 329325, 331 12, 455204, 455337, 375321, 375376, H03D 100, H03L 7087, H04L 2706

Patent

active

056684983

ABSTRACT:
A biphase stable FPLL includes a polarity determination circuit that ascertains the lockup phase of the FPLL based upon the polarity of the pilot in the digital signal. A frequency lock circuit also determines from the recovered pilot when frequency lock has occurred and the polarity determination circuit is responsive thereto for inverting the phase of the incoming, or alternatively, of the outgoing signal, as determined in order to supply an output signal of predetermined polarity.

REFERENCES:
patent: 4072909 (1978-02-01), Citta
patent: 4091410 (1978-05-01), Citta
patent: 4541118 (1985-09-01), Eastmond et al.
patent: 5077542 (1991-12-01), Lanoiselee

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