| 摘要 |
A rotation control system is used in an apparatus for reproducing information signals from a rotary recording medium by use of a reproducing stylus, wherein the rotary recording medium having the information signals recorded thereon so that the relative velocity between a recording element and the rotary recording medium is maintained constant. The rotation control system comprises a motor for rotating the rotary recording medium, variable resistor for obtaining a voltage corresponding to the position of the reproducing stylus on the rotary recording medium, variable frequency oscillator supplied with the above voltage, for producing a signal having a frequency respective of the voltage supplied thereto, rotation detector for detecting the rotation of the above motor, comparator for comparing the output signal of the variable frequency oscillator with the output signal of the rotation detector, to produce an output difference signal, and a circuit for controlling the rotation of the motor in response to the difference signal.
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