Transmission mode signaling between a facsimile transmitter and

Details Transmission mode signaling between a facsimile transmitter and Transmission mode signaling between a facsimile transmitter and

1978-03-13

1980-10-14

Martin, John C.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358288, 358267, H04N 136

Patent

active

042284660

ABSTRACT:
A facsimile transmitter comprises a rotatable drum and a sensor for detecting dark-light variations in a document mounted on the drum. A facsimile receiver comprises a rotatable drum and a writing stylus for reproducing dark-light variations on a copy medium mounted on the drum. Prior to transmission of modulated signals representing the dark-light variations in the document, synchronizing signals are transmitted from the transmitter to the receiver. The synchronizing signals comprise pulses of selected and controlled frequency duration and time lapse therebetween to signal the transmission mode. The various modes signaled include different and variable scanning rates, different frequency bandwidths and different forms of modulation.

REFERENCES:
patent: 3889057 (1975-06-01), Perreault et al.
patent: 3955045 (1976-05-01), Ford
patent: 4000371 (1976-12-01), Ogawa

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