| 摘要 |
<p>PURPOSE:To simplify a software configuration by obtaining phase error data by using theoretical value data and measured value data. CONSTITUTION:An FG signal from a drum motor 20 is input to a mechanical controller 12, a counted value of a free running counter 16 is latched in response to an FG pulse, and measured value data T0 of a period is obtained. In the case of a recording mode, a synchronizing signal Vsync from a synchronizing separator 28 and a PG signal from the motor 20 are input to the controller 12, a constant C is added to phase difference data Te of both, a predetermined constant K1 is then multiplied, its data is added to theoretical value data T1 of a period of an FG signal to obtain corrected theoretical data. Then, it is integrated by using the data T1 and the data T0 to obtain phase error data T3. And, the T0 and the T3 are combined at a ratio of K2:K3 to obtain control data T4. Thus, its leading-in range is increased, and a software configuration can be simplified.</p> |
