| 摘要 |
<p>PURPOSE:To establish the motor drive circuit for VTR unit, which can be transferred to framing operation surely, by using the circuit widely correcting the pulse width of the frame feed signal. CONSTITUTION:To the terminals 1, 3, 8 and 11, DO pulse(pulse generated at the falling part of the envelope of reproduced FM signal), head selection pulse, still reference signal, and frame feed reference signal are inputted. The still operation is made the same as conventional methods. The frame feed reference signal from the terminal 11 is corrected F widely at the pulse generation circuit 25 to gate the still reference signal and the still signal H is released for the moment with the flip flop 21. The monostable multivibrator 14 is triggered with the frame feed signal to cause excessive trigger at the frame feed reference other than the trigger by the selection pulse A. Thus, DO following state can surely be released.</p> |
