Timing reproduction device

Details Timing reproduction device Timing reproduction device

1992-12-30

1996-05-28

Chin, Stephen

Pulse or digital communications

Transceivers

Modems

4552261, 455 73, H04B 138, H04L 516

Patent

active

055219390

ABSTRACT:
A timing reproduction device includes a timing error detector for detecting an error in timing of a signal transferred between a transmission side and a reception side on the basis of a received signal and for generating a timing error signal. An integrator integrates the timing error signal to thereby hold data necessary to maintain a timing synchronization. A sensing unit senses abrupt timing change in the received signal. A timing synchronizing unit executes a timing synchronizing operation for maintaining the timing synchronization by referring the data held in the integrator. A cutoff unit executes a cutoff operation which prevents the timing error signal from being applied to the integrator on the basis of the abrupt timing change sensed by the sensing unit.

REFERENCES:
patent: 4633193 (1986-12-01), Scordo
patent: 4849997 (1989-07-01), Suzuki et al.
patent: 4956851 (1990-09-01), Wolensky et al.
Uchiyama et al, "Voiceband Modem Control Algorithm for Improving Image Quality of Mobile Telephone Facsimile." 1992 IEEE International Conf. on Selected Topics in Wireless Communications 25-26 Jun. 1992 pp. 324-327.
Kaga, "Interface", CQ Shuppan-sha, Apr., 1986.
IEEE Transactions On Communications, vol. 36, No. 9, Sep. 1988, pp. 1035-1043, H. Sari , et al., "New Phase and Frequency Detectors for Carrier Recovery in PSK and QAM System".

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