Transmission of encoded facsimile signals at variable intervals

Details Transmission of encoded facsimile signals at variable intervals Transmission of encoded facsimile signals at variable intervals

1977-06-15

1979-04-10

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358261, 346154, H04N 138, H04N 140

Patent

active

041491920

ABSTRACT:
In a facsimile communication system wherein a document is scanned along its line path to generate a binary signal waveform for each line scan and the length of black or white run of each binary digit in the waveform is translated into a corresponding code for transmission, the binary signal waveform is equally divided into a plurality of data blocks which are discriminated between significant data blocks each containing at least one "black" data bit and insignificant data blocks each being entirely at "white" level. Only the significant data blocks are counted to measure the length of recording time for the corresponding line scan. The end of the measured time is detected to proceed with the next line scan so that the next sequence of codes is transmitted at an instant which is variable to correspond to a variable recording time at the receiver station where the received codes are decoded to recover the original waveform for recording only the significant data blocks while disregarding the insignificant data blocks.

REFERENCES:
patent: 3643016 (1972-02-01), Dattilo
patent: 3662396 (1972-05-01), Brown
patent: 3769628 (1973-10-01), Kenny
patent: 3902009 (1975-08-01), Perreault
patent: 4034406 (1977-07-01), Tsuchiya

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