| 摘要 |
<p>PURPOSE:To perform reproduction at the same speed with recording by comparing a playback frame address obtained from a playback signal with a reference frame address which varies at a reference period and controlling the feed speed of a recording medium so that the difference between the both becomes constant. CONSTITUTION:When the traveling speed of the tape is equal, the reference frame address from a reference frame address generating circuit 10 is generated at the same timing with a head switching signal RFSWP. Then when the tape travels at a normal speed, the reference frame address and playback frame address are so controlled as to coincide with each other, and a subtracting circuit 7 measures how much a current traveling speed deviates from the normal tape traveling speed. Namely, the subtracting circuit 7 measures the deviation in tape traveling speed, but the value is obtained as a frame address difference and a signal corresponding to the difference is processed by PWM and supplied to a capstan driving motor 20 to perform control. Consequently, the speed of the tape is equalized to that in recording and reproduction is performed stably.</p> |
