System and method for facsimile framing

Details System and method for facsimile framing System and method for facsimile framing

1976-03-01

1978-03-21

Martin, John C.

Facsimile and static presentation processing

Facsimile

Recording apparatus

361244, H04N 136

Patent

active

040806324

ABSTRACT:
A facsimile system incorporating an up-down counter to achieve framing between a facsimile transmitter and a facsimile receiver. The facsimile receiver initially has a sweep rate different from a standard sweep rate. The up-down counter counts the facsimile transmitter and receiver sweep rates and provides the count difference between the facsimile receiver sweep rate and the sweep rate at which the transmitter is operating; the count difference corresponds to the difference in sweep position between the facsimile transmitter and receiver. Speed control circuitry is used to change the facsimile receiver to the standard sweep rate upon a predetermined output from the up-down counter which signifies that the transmitting and receiving facsimile are in framing synchronization. A method of controlling the commencement of counting of the up-down counter and of the resulting synchronizing framing is also disclosed.

REFERENCES:
patent: 3553370 (1971-01-01), Rosenheck
patent: 3643012 (1972-02-01), Clark et al.

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