| 摘要 |
<p>PURPOSE:To keep the tape run speed constant and to make a reproduced screen easy to see, by controlling a reel drive motor so that a reproduced control signal has a prescribed frequency. CONSTITUTION:Tape supply or winding reels 10 and 1 are driven with a motor 12 and a tape 2 is made run. In this case, a control signal is detected with a control head 4 and reproduced to a control signal reproducing circuit 41 and introduced to a speed detector 42. The speed detection signal is inputted to an operational amplifier 44 via a resistor 43 and the output is applied to a reel drive motor 12 via a DC amplifier 48. Thus, automatic frequency control servo loop can be formed so that the run speed of the tape 2 is constant.</p> |
