Facsimile transmission mode signaling

Details Facsimile transmission mode signaling Facsimile transmission mode signaling

1975-09-26

1978-03-14

Martin, John C.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358275, H04N 136

Patent

active

040794253

ABSTRACT:
A facsimile transmitter comprises a rotatable drum and a detector for detecting dark-light variations in a document mounted on the drum. A frequency modulator is coupled to the detector for generating frequency modulated transmission signals representing dark-light variations in the document. A sync generator, which generates synchronizing pulses coincident with juxtaposition between the detector and the document-holding clamp on the drum, is also coupled to the frequency modulator. The transmission mode, e.g. the choice of utilizing an internal stable frequency or external power line frequency synchronizing signal to synchronize the drive of the drum, is signaled by varying the length of the synchronizing pulse during the sync period preceding transmission of document information.

REFERENCES:
patent: 3313884 (1967-04-01), Hackenberg et al.
patent: 3436474 (1969-04-01), Saeger et al.
patent: 3448207 (1969-06-01), Green et al.
patent: 3646256 (1972-02-01), Jacob et al.
patent: 3761610 (1973-09-01), Krallinger et al.
patent: 3819854 (1974-06-01), Kolb
patent: 3889057 (1975-06-01), Perreault
patent: 3919464 (1975-11-01), Kondoh

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