| 摘要 |
<p>PURPOSE:To accurately pull-in a noise in a short time by making the pulse width different which is outputted with the phase difference between an envelope changeover signal and a head changeover signal in the manner that a starting pulse having the pulse width corresponding to the phase difference is outputted. CONSTITUTION:The envelope signal is inputted to a preamplifier 14, and after a specified process is performed by the preamplifier 14, the envelope changeover signal is outputted. When the phase difference T in the rise of the envelope changeover signal and the fall of the head changeover signal is represented as, e.g. a>=T>b, the starting pulse having the pulse width, e.g. Xi is outputted, then a capstan motor 22 is started. Thus, when the phase difference T in both signals becomes, e.g. b>=T>c, the starting pulse having the pulse width of X1/2 is outputted. Further, the phase difference T becomes, e.g. c>T, the starting pulse having the pulse width, e.g. X1/4 is outputted.</p> |
