Synchronizing circuit for detecting and interpolating sync signa

Details Synchronizing circuit for detecting and interpolating sync signa Synchronizing circuit for detecting and interpolating sync signa

1982-09-27

1984-06-05

Griffin, Robert L.

Pulse or digital communications

Spread spectrum

Direct sequence

375119, 370105, H04J 306

Patent

active

044532601

ABSTRACT:
A synchronous circuit comprises a sync signal detecting circuit connected to receive a digital signal with a plurality of frames each consisting of N bits and containing a frame sync signal to detect a sync signal in each frame, and a sync protecting circuit for producing a sync control signal synchronized with the detection of the sync signals and interpolating the sync control signal every frame when the sync signal is not detected. The sync protecting circuit has a counter for counting the number of frames in which the sync signals are not detected. A circuit is provided to quickly synchronize the sync protecting circuit with the detection of the sync signal by the sync signal detecting circuit when noise is produced by the sync signal detecting circuit and then a sync signal is detected after a given value has been counted by the counter.

REFERENCES:
patent: 3978285 (1976-08-01), Tan et al.
patent: 4275466 (1981-06-01), Yamamoto
patent: 4347606 (1982-08-01), Hoogeveen

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