| 摘要 |
<p>PURPOSE: To prevent a screen from floating when reproducing in a slow-motion mode and to obtain a stable and noiseless screen by providing a drum control part having a D/A converter and a control means equipped with a capstan motor control part. CONSTITUTION: When a capstan motor 501 of a capstan servo system 500 turns the capstan in a sequence of speed increase, constant speed, and speed decrease, a relative rotation speed between a rotation speed of the capstan motor 501 and that of a drum motor 410 varies. And then, a drum motor 610 of a control means 600 outputs pulses for drum speed correction, which are D/A converted by a digital-analog(D/A) converter 611 and are impressed on an impedance matching part 408 of a drum servo system 400. Since the pulses for the drum speed correction take a form of a gradually rising and a gradually falling characteristics, this prevents a head drum 401 from being abruptly started or stopped and floating of a screen is mostly eliminated at the time of reproducing in a slow motion mode.</p> |
