| 摘要 |
<p>PURPOSE:To perform a stabilized slow reproduction motion by letting the output of a Schmitt circuit fall with the Schmitt circuit being reset after the lapse of a fixed time from its rise. CONSTITUTION:The time width t0 of the output pulse of a monostable multivibrator 8 is selected longer than the gap from the rise of the CTL (control) signal up to its fall during an ordinary reproduction, i.e., one period of the CTL signal. In case, therefore, of the reproduction being performed at the tape speed of an ordinary reproduction or more than that, the output of the monostable multivibrator 8 is always an H, the diode is attained to a cut-off state and a Schmidt circuit 7 is not reset. On the other hand, when the time t0 elapses after the rise of the circuit 7 at the slow reproduction time, the output of the monostable multivibrator 8 falls. The output of the monostable multivibrator 8 becomes an L, the circuit 7 is reset and its output falls. The stable slow reproduction motion is thus enabled owing to the circuit 7 being reset after a certain time even in case of the CTL signal being not read according to its stoppage position.</p> |
