Method and apparatus for resynchronizing two system clocks

Details Method and apparatus for resynchronizing two system clocks Method and apparatus for resynchronizing two system clocks

1997-07-08

2000-08-29

Pham, Chi H.

Pulse or digital communications

Synchronizers

Frequency or phase control using synchronizing signal

455 383, H04L 700, H04B 700

Patent

active

06111927&

ABSTRACT:
A radio telephone system clock is resynchronized in idle mode in relation to an associated transmitter/receiver station system clock, e.g. a fixed part for the DECT system, by counting the number of clock pulses between two detections of the preamble and the sync word of the DECT signal and using the counter status for determining a correction value. In addition to the system clock, a clock device comprises at least a further clock. A counter device counts the clock pulses from the clock, and a control device monitors the status of the counter device and activates the detecting means in response thereto when the status corresponds to the estimated arrival of the next preamble. The control device is adapted to register the status of the counter device when the detecting means detect the preamble and to correct the activation time of the detecting means for the next preamble for detection in response thereto.

REFERENCES:
patent: 5408504 (1995-04-01), Ostman
patent: 5590160 (1996-12-01), Ostman
patent: 5740517 (1998-04-01), Aoshima
patent: 5758278 (1998-05-01), Lansdowne
patent: 5790941 (1998-08-01), Peponides
patent: 5815819 (1998-09-01), Ohta et al.
patent: 5845204 (1998-12-01), Chapman et al.

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