| 摘要 |
<p>PROBLEM TO BE SOLVED: To satisfactorily reproduce a distorted track. SOLUTION: An output of a preamplifier 22 is peak-detected at three points of the beginning, the middle and the end of a track by a peak detector 24. These three-point detecting outputs A, B and C are compared by a comparator circuit 28 and differencesΔT (=B-A) andΔE (=B-C) are impressed upon a microcomputer 30. Stepping motors 18 and 20 are rotated via motor driving circuits 32 and 34 so that theΔT andΔE become small by the microcomputer 30 by which the heights of an inlet side post 14 and an outlet side post 16 are adjusted respectively.</p> |
