| 摘要 |
<p>PURPOSE:To make optimal intermittent slow reproduction possible even when variation of load is caused by change of temperature and change with the passage of time by driving a motor in proportion to the difference between prescribed period measured time from starting to stopping of a capstan motor. CONSTITUTION:When an intermittent slow reproduction setting signal (a) is inputted to a generating circuit 16, a start pulse is outputted to the generating circuit 16 and a driving circuit 18 synchronously, and the period from starting to stopping by braking of a capstan motor 7 of 1 period Ts is measured by a measuring counter 20, and a digital signal of the measured value is outputted to a subtractor 22. A digital signal of prescribed period determined by optimal relation between running speed of a tape 1 that minimizes S/N, rolling etc. to prescribed load of the motor 7 and outputted from a system controlling section to an input terminal 21 is subtracted from a digital signal of measured period TX of the counter 20 by the subtractor 22, and a digital signal of period difference of 1 period Ts before is outputted from a latch circuit 23 to a gain control circuit 24. The controlling circuit 24 supplies the same supply voltage with the time of prescribed fixed load to the driving circuit 18.</p> |
