| 摘要 |
PURPOSE:To prevent unnecessary mechanical vibrations by simple constitutian by supplying a driving voltage to an electromechanical transducing element through a low-pass filter when a video head does not scan a video track. CONSTITUTION:The output signal of an arithmetic circuit 33 is applied to high-dielectric-strength amplifier 31 and 32 through filter circuits 41 and 42. For example, when a control signal for the switch circuit 104 of the filter circut 41 has a level H, switches 111-113 of the switch circuit 104 are closed. Namely, a signal supplied to an input terminal 101 is led to an output terminal 105 through an LPF102 during a period Q. In a period R, on the other hand, the signal is outputted through an LPF103 and in a period S, it is outputted directly. Using a filter having a switching type like this eliminates unnecessary high-frequency component waveforms applied to electromechanical transducing elements 21 and 22, so that the vibrations of the tips of video heads 1 and 2 are nearly eliminated. Thus, unnecessary mechanical vibrations are prevented by the simple structure. |
