Device for deriving a synchronizing signal

Details Device for deriving a synchronizing signal Device for deriving a synchronizing signal

1986-09-04

1989-06-06

Olms, Douglas W.

Pulse or digital communications

Spread spectrum

Direct sequence

307516, H04L 700

Patent

active

048377830

ABSTRACT:
A device for deriving a synchronizing signal comprises a synchronizing signal detector (1) having an output (3) is coupled both directly and via a delay unit (18) to inputs (4 and 19, respectively) of a signal combination unit (5). The output (6) thereof is coupled to an input (7) of a flywheel counter (8). One output (9) of the flywheel counter supplies the synchronizing signal. Another output is coupled to an input (11) of the signal combination unit. The first input (4) and the second input (11) of the combination unit are coupled to inputs of a time slot circuit (12). The first input (4) and the third input (19) of the combination unit are coupled to inputs (20, 21) of a further combination unit (14). The output of the time slot circuit is also coupled to an input (13) of the further combination unit (14). The delay time (T) of the delay unit (18) is equal to n times the period of the synchronizing signal. Therefore, the device is less sensitive to "false lock" and can recapture the synchronization rapidly after a loss of synchronization.

REFERENCES:
patent: 3581010 (1971-05-01), Kobayashi
patent: 4308550 (1981-12-01), Melwisch et al.
patent: 4354229 (1982-10-01), Davis et al.
patent: 4356566 (1982-10-01), Wada et al.
patent: 4398291 (1983-08-01), Hotta et al.
patent: 4675722 (1987-06-01), Hackett

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