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

1995-10-20

1997-08-26

Tse, Young T.

Pulse or digital communications

Receivers

Automatic frequency control

375326, 329304, H04L 2722

Patent

active

056617615

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: 4941155 (1990-07-01), Chuang et al.
patent: 5012491 (1991-04-01), Iwasaki
patent: 5079512 (1992-01-01), Muto
patent: 5090027 (1992-02-01), Ohsawa
patent: 5097220 (1992-03-01), Shimakata et al.
patent: 5249203 (1993-09-01), Loper

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