Carrier synchronizing system for locking a remotely located carr

Details Carrier synchronizing system for locking a remotely located carr Carrier synchronizing system for locking a remotely located carr

1985-04-03

1986-12-02

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358149, 358159, 358 17, 375107, 455 51, H04N 504, H04N 944

Patent

active

046269142

ABSTRACT:
The base station comprises a reference carrier generator and a synchronized carrier generator is provided in at least one remote station. Carrier synchronizing information is transmitted from the base station to the remote station and the synchronized carrier and information to be transmitted therewith are transmitted from the remote station to the base station. The base station has a periodically variable phase shifter to an input of which the synchronized carrier is applied, an output being coupled to a phase comparator to which in addition the reference carrier wave is applied. During first periods the phase shifter is subjected to a continuous phase shift. Second periods present in the first period are counted by a counter which is resettable under the control of the first periods. The counter is stopped by the phase comparator when a reference phase is reached during the phase shift. The counting result is numerical carrier synchronizing information, as required for a micro-processor or a micro-computer. The phase shift is effected incrementally, to an increasingly smaller portion of the carrier wave period near the zero phase.

REFERENCES:
patent: 4214261 (1980-07-01), Bazin et al.
patent: 4333103 (1982-06-01), Koiwa et al.
patent: 4445135 (1984-04-01), Heitmann et al.
patent: 4532547 (1985-07-01), Bennett

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