| 摘要 |
<p>PURPOSE:To facilitate the speed control of a drum without increasing the number of components and the change of the configuration of a servo system by constituting a phase detector and two speed detectors with one microprocessor. CONSTITUTION:At the time of recording, a change-over switch 15 is changed over to the side of a detector 12 for FG, and a speed error value outputted from the detector 12 is added on a phase error value outputted from the phase detector 13 at an adder 16 at every input of FG to an input capture 11. At the time of reproduction, the switch 15 is changed over to the side of the speed detector 14 for a horizontal synchronizing signal, and the speed error value outputted from the speed detector 14 is added on the phase error value outputted from the phase detector 13 at the adder 16 at every input of the horizontal synchronizing signal to the input capture 11. In such configuration, the speed detectors 12, 14 and the phase detector 13 can be constituted of one microprocessor 10.</p> |
