Scan interlock system

Details Scan interlock system Scan interlock system

H - Electricity

04

N

350/9

H04N 1/36 (2006.01)

Patent

CA 1113598

AN IMPROVED SCAN INTERLOCK SYSTEM ABSTRACT OF THE DISCLOSURE In a facsimile communication system transmitting a signal sequence indicative of a scan-by-scan reading of a document, the improvement including a scan interlock control system for matching the scan pitch rate in the receiver with the scan pitch rate in the transmitter. During each scan, the transmitter provides a scan synchronization pulse which is compared for coincidence with a receiver scan synchronization pulse. If a mismatch is found, the minimum bit width in a receiver scan counter is altered by a variable length counter towards a matching direction. The adjusted scan counter then provides the serial bits of data which, through a D/A converter, control the scanning mechanism in the receiver.

270055

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