| 摘要 |
<p>PURPOSE:To use only one unit of oscillator to generate a reference signal, by dividing the oscillation output of a reference signal oscillator with a division ratio according to the running speed of a magnetic tape, then controlling the rotating speed of a rotary magnetic head. CONSTITUTION:The output of a reference signal oscillator 21 is applied to a divider 22. Then plural working mode signals are applied to the divider 22 from a working mode signal leading circuit 23, and the divider 22 switches its division ratio. Subsequently, the output of the divider 22 is applied to a motor drive control circuit 24 to give a control to the rotating speed of a motor 25 that turns a rotary magnetic head 26.</p> |
