Signal processing system of facsimile

Details Signal processing system of facsimile Signal processing system of facsimile

1979-09-17

1981-11-17

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358260, 358288, H04M 712

Patent

active

043014798

ABSTRACT:
A group III facsimile which substantially reduces the transmission time is disclosed wherein marks are applied to a document to be transmitted in order to identify the portions of the document depending on whether or not to be transmitted, after the document is scanned the presence or absence of the marks in the scanned lines, that is, whether or not the scanned output signals are to be transmitted will be determined by the electrical signals scanned, and in place of scanned lines unnecessary to transmit, special code signals are sent each of which consists of less bits, for example, a code indicating that one line is wholly white, a fill code, and a code indicating the end of a line.

REFERENCES:
patent: 3061672 (1962-10-01), Wyle
patent: 4044382 (1977-08-01), Yagishita
patent: 4186415 (1980-01-01), Takayama
H. Wyle et al., "Reduced-Time Facsimile Transmission by Digital Coding", 9-24-61, pp. 215-217, IRE Comm. Syst.
B. M. Rosenheck, "Fastfax, A Second Generation Facsimile System Employing Redundancy Reduction Techniques", vol. COM-18, No. 6, Dec. 1970, pp. 772-776, IEEE Transaction on Communication Technology.

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