| 摘要 |
<p>PURPOSE:To provide such a tape traveling speed controller which can execute precise phase control. CONSTITUTION:A 1st edge detector detects the rising of a 30Hz control signal and a phase comparator compares the phases of a 30Hz reference signal and the rising edge of the control signal and outputs a 1st error signal. A 2nd edge detector detects the rising edge and falling edge of the 30Hz control signal and a 2nd phase comparator compares the phases of a 60Hz reference signal and the rising edge and falling edge of the control signal and outputs a 2nd error signal. The 1st error signal and the 2nd error signal are added by an adder and the result thereof is applied via a low-pass filter to a subtractor. The subtractor computes a phase error from the speed error and a DC servo motor is controlled by the output thereof.</p> |
