| 摘要 |
<p>PURPOSE:To perform a stabilized slow reproduction motion by resetting a Schmitt trigger circuit by a brake signal or the signal synchronizing therewith at the slow reproduction time. CONSTITUTION:Since a brake signal is always caused in the frame feeding motion of a slow reproduction, this brake signal is inputted into the differential circuit composed of resistances 12, 13 and a capacitor 14 and its rise is differentiated. The differentiated brake signal turns a transistor (Tr) 11 on. Owing to a resetting signal being given to a circuit 7 via a resistance 10 with the Tr 11 ON the circuit 7 is reset and its output falls. The circuit 7 is surely reset until the succeeding frame feeding and the output is attained to an L level. In the case of immediately stopping a control (CTL) signal with its reading accordingly, the rise of the succeeding signal can surely be read even in case of obtaining no prescribed level of the CTL signal due to the slowing down of a tape speed.</p> |
