Digital capstan servo circuit

Details Digital capstan servo circuit Digital capstan servo circuit

G - Physics

11

B

352/21.22

G11B 15/28 (2006.01) G11B 15/467 (2006.01) H02P 23/00 (2006.01)

Patent

CA 1210149

A DIGITAL CAPSTAN SERVO CIRCUIT ABSTRACT OF THE DISCLOSURE A digital capstan servo circuit controls the rotation of a capstan motor used for sending a recording medium of a recording apparatus having a recording circuit for recording a plurality of pilot signals instead of CTL signals used for a tracking servo of the capstan motor in a reproducing mode. The pilot signals have dif- ferent frequencies respectively and are recorded under being mixed with a video signal on video tracks. In the recording mode, a rotation speed information obtained from a counter of which a counting value is latched by a latch pulse produced from FG signals which are generated synchronously with the capstan motor and a rotation phase information obtained from the counter of which a counting value is latched by a latch pulse produced from an oscillator, an output signal of the oscillator having the same frequency as that of but a different phase from as that of the FG signals, are mixed to be a control signal of the capstan motor.

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