Dual-mode synchronization device, in particular for frame clock

Details Dual-mode synchronization device, in particular for frame clock Dual-mode synchronization device, in particular for frame clock

1990-09-11

1992-09-29

Kuntz, Curtis

Pulse or digital communications

Spread spectrum

Direct sequence

3701051, H03D 324, H04J 306

Patent

active

051519275

ABSTRACT:
A dual-mode synchronization device is designed in particular to recover the phase of the frame clock in a half-duplex transmission system. It is included in a receiver in a half-duplex digital transmission system in which a receiver receives frames only at regular intervals. The device comprises an energy sensing phase locking first system and a phase recovery second system which senses a reference pattern. A selector system selects one of the phase difference indications supplied by the first and second systems, under the control of a respective binary indication of loss or acquisition of synchronization. A particular application of the invention is to half-duplex transmission using the WAL2 code.

REFERENCES:
patent: 3251034 (1966-05-01), Goode et al.
patent: 3575554 (1971-04-01), Schmidt
patent: 4598413 (1986-07-01), Szechenyi

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