| 摘要 |
<p>A control system for a helical scan video tape recorder having two scanning heads each of which employs a bismorph plate to dynamically control the tracking path of its respective head chip, produces separate dynamic control signals for each of its two heads by "wobbling" or "dithering" the heads with respect to their scanning paths and employing resulting amplitude variations in the reproduced signals to drive the mean paths of the head chips into coincidence with the recorded tracks being scanned. A transfer circuit transfers a portion of an offset voltage, representing a final control signal existing at the end of scanning of a recorded track by one of the heads to the control system controlling the other head. This tends to bias the second head in the same direction in which the first head is biased in order to avoid the two heads scanning different tracks during still or slow motion reproduction</p> |
