| 摘要 |
<p>PURPOSE:To ensure the automatic inversion, by specifying the forming method of magnetic tape running direction inversion signal. CONSTITUTION:The switching circuit 17, frequency-voltage conversion circuit 18, comparator 20, and NOR gate circuit 14 are connected between the number of rotation detection circuits 15, 16 for the reels 2, 3 and the tape running direction control circuit 21. Further, the reference voltage VC of the comparator 19 is set to almost equal value to the output voltage VB of the freqency-voltage conversion circuit 18 when the residual amount of the magnetic tape of the supply reel is slight. Thus, the reproduction part is closed to the termination part of the magnetic tape 1 for a given distance and the voltage VB is higher than the reference voltage VC, then the comparator 19 supplies the low level voltage to the NOR gate 14, and tape inversion signal is output, only when the part of reproduction of the reproduction heat 8 of the magnetic tape 1 closes less than a given distance than the termination part and the reproduction signal has no signal.</p> |
