Method and apparatus for facsimile scanning

Details Method and apparatus for facsimile scanning Method and apparatus for facsimile scanning

G - Physics

05

B

350/9

G05B 1/06 (2006.01) H04N 1/36 (2006.01)

Patent

CA 1099389

U.S. 622,215 ABSTRACT OF THE DISCLOSURE A facsimile transceiver comprises a rotatably mounted drum and an information transducer juxtaposed to the drum for marking on a copy medium carried by the drum or detecting dark-light variations in a document carried by the drum. The drum is driven by a DC motor with the speed of the motor controlled by a phase locked loop in which the phase and frequency of reference pulses are compared with the phase and frequency of pulses having a frequency proportional to the speed of rotation of the drum.

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