| 摘要 |
<p>PURPOSE:To enable servocontrol even if an RF signal is not obtained when the servosystem for the revolving speed of a drum using a reproducing clock is adopted. CONSTITUTION:When a reproducing RF signal capable of generating a reproducing clock as revolving speed information is not detected, the control signals for a revolving speed of the drum (23, 24, 25) are generated by utilizing a simplified FG signal generated by the counter electromotive voltage of a drum motor 17 driving the rotation of a head drum 1 as the revolving speed information. When the reproducing clock as the revolving speed information is generated, the control signals for revolving speed of the drum(21, 24, 25) are generated by utilizing the clock signal as the revolving speed information. The servo-control for revolving speed of drum is executed by means of these control signals for revolving speed of the drum.</p> |
