Digital signal control system in a facsimile communication

Facsimile and static presentation processing – Facsimile – Recording apparatus

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358260, 358264, 371 57, H04N 712

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active

042964393

ABSTRACT:
In a digitalized facsimile transmission system, (k) number of scanning lines (k=2 or 4) are encoded to a relative address code and the next scanning line is encoded to a run length code, and each scanning line has the related synchronization code pattern corresponding either said relative address code or said run length code. Thus, the effect of a transmission error is restricted within one scanning line when that error occurs in the scanning line encoded to run length code, or k lines when that error occurs in the scanning line encoded to relative address code. The value (k) is switched between k=2 and k=4 according to the instantaneous quality of a communication line. When the quality is good, k=4 is selected, and when the quality is bad, k=2 is selected. The reception side can switch the decoding systems between relative address decode and run length decode, by being controlled through the related synchronization code patterns.
A synchronization code pattern has a plurality of O's inserted between a pair of 1's (1000 . . . 0001), and the number of O's between said 1's indicates one of relative address code and run length code.
In order to discriminate a facsimile information from a synchronization code pattern, when the facsimile information has the more continuous O's than (n), an idle signal having the value "1" is inserted in every (n-1) number of continuous O's of the facsimile information. Said idle signal is deleted automatically in the receiver.

REFERENCES:
patent: 3777066 (1973-12-01), Nicholas
patent: 3830966 (1974-08-01), Aldrich et al.
patent: 3914538 (1975-10-01), Perreault et al.
patent: 4000371 (1976-12-01), Ogawa
patent: 4070694 (1978-01-01), Sakamoto et al.
patent: 4131915 (1978-12-01), Nakagome et al.
Donnan, Transmission Synchronizing Method, IBM Tech Disclosure Bulletin, vol. 11, #11 Apr. 1969, p. 1570.

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