Television facsimile transmission system

Details Television facsimile transmission system Television facsimile transmission system

1975-11-03

1977-07-05

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 708

Patent

active

040344053

ABSTRACT:
Facsimile transmission can be effected in a conventional television system by means of code words which occur in a television line period in a field blanking interval. Transmission in the UHF band does not give rise to specific problems, but transmission in the VHF band does, in particular in that pulse disturbances occur. The influence of these disturbances can be eliminated by transmitting the same facsimile information during two (or more) successive line periods. The receiver is provided with a circuit which includes three delay devices, one having a delay time equal to a line period and the other two having delay times equal to at least the duration of a facsimile code word. The pulse disturbance is detected by means of a superposition stage and a signal detector, and the undisturbed code word is supplied via a change-over stage to a storage stage.

REFERENCES:
patent: 3493674 (1970-02-01), Houghton
patent: 3726992 (1973-04-01), Eguchi

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