Dual-mode synchronization device, in particular for frame clock phase recovery in a half-duplex transmission system
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United States of America Patent
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Sep 29, 1992
Grant Date -
N/A
app pub date -
Sep 11, 1990
filing date -
Sep 12, 1989
priority date (Note) -
Expired
status (Latency Note)
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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.
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