Method and apparatus for synchronizing facsimile transceivers

Details Method and apparatus for synchronizing facsimile transceivers Method and apparatus for synchronizing facsimile transceivers

1976-04-12

1977-08-23

Morrison, Malcolm A.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358274, 318314, 346138, H04N 136, G01D 1534

Patent

active

040443833

ABSTRACT:
In a facsimile system, rotation of a transmitter drum carrying a document is synchronized with the rotation of a receiver drum carrying a copy medium. Synchronization is achieved by rotating the transmitter drum at a substantially constant angular frequency while generating transmitter synchronizing pulses corresponding to that frequency and rotating the receiver drum at an initial angular frequency while generating receiver synchronizing pulses corresponding to the initial frequency where the initial frequency of the receiver drum differs substantially from the constant frequency of the transmitter drum. When partial coincidence between portions of a transmitter synchronizing pulse and the receiver drum synchronizing pulse is detected, the receiver drum is rotated at another frequency closer to the constant frequency of the transmitter drum. When a reversal in the lead-lag relationship between the transmitter synchronizing pulse and the receiver drum synchronizing pulse corresponding to substantial coincidence between the synchronizing pulses is detected, the receiver drum is driven at the constant angular frequency of the transmitter drum.

REFERENCES:
patent: 3355649 (1967-11-01), Boylan et al.
patent: 3441665 (1969-04-01), Wuensch
patent: 3582550 (1971-06-01), Latanzi et al.
patent: 3614319 (1971-10-01), Krallinger et al.
patent: 3622703 (1971-11-01), Ricketts, Jr. et al.
patent: 3761610 (1973-09-01), Krallinger et al.

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