Method and apparatus for synchronizing a facsimile transmission

Details Method and apparatus for synchronizing a facsimile transmission Method and apparatus for synchronizing a facsimile transmission

1975-12-22

1977-09-13

Martin, John C.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358293, 358263, 358265, H04N 104, H04N 106, H04N 136

Patent

active

040486575

ABSTRACT:
A facsimile transmission system is described which includes a transmitter section having an optical sensor driven across a selected document by a variable speed motor controlled by the frequency of an oscillator. The relative movement of the sensor with respect to the document is indicated by a pulse generator which clocks the output of the sensor into a storage memory. The stored data is clocked from the storage memory by the oscillator output and fed, along with the oscillator signal, to a diphase modulator. At a receiver section, the diphase signal is demodulated providing data and clock signals. The data signal is placed into a receiver storage memory. The clock frequency is used to control the speed of a recorder motor driving a recorder. A pulse generator is coupled to the recording device and generates recorder location pulses which are used to clock the data from the memory.

REFERENCES:
patent: 2540922 (1951-02-01), Wickham
patent: 3313884 (1967-04-01), Hackenberg et al.
patent: 3461227 (1969-08-01), Perreault
patent: 3566034 (1971-02-01), Brouwer
patent: 3582549 (1971-06-01), Hell et al.
patent: 3666880 (1972-05-01), Krause
patent: 3715498 (1973-02-01), Haynes
patent: 3800080 (1974-03-01), Fuwa
patent: 3846583 (1974-11-01), Boulter
patent: 3902008 (1975-08-01), Ogawa
patent: 3975761 (1976-08-01), Taudt et al.
Edwardson, "The Digital Timing-Correction of Video Tape Recorded Colour Television Signals", Proceedings of the Conference on Video and Data Recording, Birmingham, England (10-12 July 1973); pp. 27-39.

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