Matsushita Graphic Communication Systems, Inc.

Tadasu Takeuchi

Masaaki Nagase

Hidetsugu Ishikawa

In a thermal recording system wherein a linear array of elemental resistance electrodes is employed to record received data bits which are organized into data segments of equal bits, the resistance array is divided into a plurality of identical blocks (#1 to #64) corresponding to the data segments. Successively arranged resistance blocks are selected by a selector (42) in response to first and second write-command pulses supplied from pulse generators (22, 24) in synchronism with the receipt of each data segment to record black dots corresponding to the received data bits. The first and second write-command pulses are generated so that the period of each pulse partially overlaps the period of the other, whereby the preceding resistance block is selected simultaneously with the subsequent one after the corresponding data bits have been removed. After-effect currents are supplied to the preceding block to increase the image density of the recorded black dots while the recording of the subsequent data segment is in progress. The after-effect currents are not sufficient to heat up the resistance elements which correspond to white areas.

System for thermally recording data by partially overlapping successive

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.

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Tokyo, Japan

Tadasu Takeuchi