Time-axis picture-signal converter for facsimile and the like

Details Time-axis picture-signal converter for facsimile and the like Time-axis picture-signal converter for facsimile and the like

1980-05-23

1981-09-08

Britton, Howard

Facsimile and static presentation processing

Facsimile

Recording apparatus

358293, 358294, H04N 140

Patent

active

042888204

ABSTRACT:
For a medium- or low-speed facsimile, a solid-state image sensor is now usable and scans each line on the sheet a plurality of times for a one-scan-line picture signal output to the circuit line. The sensor output, of high bit rate, is distributed alternately to a pair of analog memory devices and the contents of the memory devices are read out alternately therefrom at low rate in a manner such that the picture signal blocks in each of the multiple one-line segment from the image sensor are joined with each other to form an expanded one-scan-line picture signal for line transmission. A reference signal for signal level restoration is inserted during the read-out period of the memory devices. Because of this, the length of time that the picture signal stays in the memory devices is reduced to decrease the influence of the noise component arising therein and also the number of memory elements of the memory devices can be reduced to further decrease the noise influence.

REFERENCES:
patent: 3752912 (1973-08-01), Ohsawa
patent: 3800080 (1974-03-01), Fuwa
patent: 4081843 (1978-03-01), Okano
NEC Technical Journal, No. 126, pp. 30-33, "NEFAX-3500, New Model, Medium Speed Facsimile NEFAX-3500".

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