| 摘要 |
A capstan motor controller includes a capstan motor for moving a recording medium, a motor driver for driving the capstan motor, a capstan frequency generator (CFG) for generating a CFG signal according to the rotation of the capstan motor, a speed controller for generating reference pulse trains having different periods in order to control the speed of the capstan motor according to a mode's speed data and designated by a user and a CFG signal, a trapezoid generator for converting the reference pulse train to a trapezoid signal, and a sampling portion for sampling the trapezoid signal according to the CFG signal and supplying the trapezoid signal to the motor driver. By controlling the capstan motor according to digital data, the controller is advantageous in rotating the capstan motor at different speeds according to modes and stabilizing the rotation speed according to those modes.
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