| 摘要 |
<p>PURPOSE:To promote a response of a tracking control by adding a tracking detection output to an error of a speed system when an F-V output of a capstan motor becomes smaller than an adding reference value and also continuing the addition by a time set by a monostable multivibrator circuit. CONSTITUTION:When the capstan motor 1 approaches a target speed and an output of an F-V converter 4 becomes smaller than the reference value 10, this is detected by a comparator circuit 9 to be outputted to the monostable multivibrator circuit (MM) 11. An adder 8 is allowed by the MM 11 to add an output result of a tracking detection means 7 to a speed system error. Simultaneously, during a fixed time determined by a set value of the MM 11, the addition of the output result of the detection means 7 to the speed system error is not discontinued by the circuit 9 even when an output result of the F-V converter 4 becomes larger than the reference value 10. By this method, the tracking control is smoothly carried out.</p> |
