Quasi-synchronous detection and demodulation circuit and frequen

Details Quasi-synchronous detection and demodulation circuit and frequen Quasi-synchronous detection and demodulation circuit and frequen

1993-07-09

1995-03-21

Coles, Sr., Edward L.

Pulse or digital communications

Repeaters

Testing

375 39, 375 94, 375 98, H04L 2706, H04L 512, H04L 2708, H03D 100

Patent

active

054003660

ABSTRACT:
The present invention relates to a quasi-synchronous detection and demodulation circuit with a contingent demodulation carrier phase removing function and to a frequency discriminator used in the above circuit and for detecting with a good accuracy the difference between the carrier frequency of a modulated wave and a reference carrier frequency for demodulation. In order to detect a normal frame pattern by a frame pattern detecting means, the quasi-synchronous detection and demodulation circuit compensates an output carrier phase issued from a carrier generating means to add to a phase rotation means and removes a contingent demodulated carrier phase. The frequency discriminator limits a frequency deviation to less than an upper value according to the accuracy of a reference carrier signal.

REFERENCES:
patent: 5012491 (1991-04-01), Iwasaki
patent: 5107522 (1992-04-01), Kitayama
patent: 5311545 (1994-05-01), Critchlow

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