| 摘要 |
A phase locked loop control system, in particular for use for synchronizing the operation of a carriage drive motor and a main drive motor in a photocopier, uses a digital frequency- and phase-comparator and relies on the output pulses, used to power the slaved motor, being shaped so that each positive-going d.c. drive pulse is followed by a negative-going d.c. braking pulse of smaller amplitude, to provide positive registration of the slaved motor with the pulsed driving signal.
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