| 摘要 |
<p>PURPOSE:To set the relative speed of a tape at a constant level without performing adjustment, by switching the frequency of the reference clock oscillation of a digital servo corresponding to the reproduction of variable speed. CONSTITUTION:When a device is operated at normal speed, a cylinder 9 on which phase control and speed control are applied setting the frequency of a clock signal generated by a crystal oscillator 16 and a lock oscillation circuit 13 as the frequency of the reference signal of the digital servo 10 is rotated at stationary speed. Next, in the reproduction of the variable speed, by switching a switch 15, the frequency of the clock signal generated by a crystal oscillator 17 and a clock oscillation circuit 14 is switched to the reference of the digital servo, and the relative speed of the tape can be kept at the constant level, thereby, it is possible to observe a reproducing image without having the running of a synchronizing signal.</p> |
