| 摘要 |
<p>PURPOSE:To obtain the slow-reproduction picture of high fidelity with few screen deflections and noises, by driving a capstan motor with plural pulse columns per field outputted from a control circuit and a phase control circuit. CONSTITUTION:A rotational pulse (a) from a pulse generator 84 linked to a capstan motor 81 is inputted to a mono-multi vibrator 101, and a pulse train (b) with a prescribed width is outputted from the leading edge of the pulse (a). For the width of the pulse train (b), a time constant is determined by as monostable multiadjusting volume 102 and a capacitor 103, and an undriven time is made constant. On the other hand, due to the phase difference between a phase signal (g) from a terminal 90 and a signal (e) divided by a divider 11 supplied from a terminal 91, an output voltage (c) from a sample-hold circuit 112 changes. Thus, by making the undriven time constant and controlling the phase between the signal (e) and the signal (g), the speed of the motor 81 can be stabilized and the slow reproduction can be realized.</p> |
