| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a magnetic recording/reproducing device accelerating drawing operation at a special reproducing time and performing stable APC (automatic phase control) control. SOLUTION: A means where one among plural FGs(frequency generator sensors) outputted at every one revolution of a drum not related to a delay amount of a PG(phase detection sensor) mono-multivibrator is selected as a signal of a side to be phase compared, and switching that signal to an HSW (switching pulse) being the signal to be phase compared in recording, unmagnified speed reproducing mode is added to the device. Further, since when regular reproducing (unmagnified speed) is shifted to the special reproducing, and when the special reproducing is shifted to the regular reproducing (unmagnified speed), the signal to be phase compared is switched respectively to the HSW signal and the FG signal, by selecting the FG signal with the phase nearest to the HSW signal with an FG selection part 16 for shortening a drawing time, the fast drawing operation and stable drum APC control is realized.</p> |
