| 摘要 |
<p>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.</p> |
