| 摘要 |
<p>PURPOSE:To satisfactorily shorten the interruption processing time by decelerating the drive of a motor in the case it is detected with measurement of the FG pulse cycle that the tape speed is controller to a higher level as the shortage of the arithmetic processing time is increased. CONSTITUTION:A capstan motor 32 is prepared and the rotation detecting pulse (FG pulse) received from a rotation detector (frequency generator) 34 is inputted to a microcomputer 30. The microcomputer 30 outputs a control command of the motor 32 to a motor drive circuit 31 based on a command given from a system control circuit 33. In the case such a high speed that causes the shortage of the arithmetic processing time is detected by the speed information given from a speed detecting means 34, the multiplying process of the FG pulse is stopped and the filter arithmetic is omitted. Then a motor control command proportional to the speed error information or a deceleration command for a fixed degree is outputted to the circuit 31. The speed control is performs so as to perform the filter arithmetic again when the motor 32 is decelerated down to an arithmetic process enable state. As a result, the interruption processing time is extremely shortened.</p> |
