Magnetic video head position control

摘要

A positionable magnetic head may be used in the record mode to produce video tape recordings in industry standard moving record-moving head format. In the record mode a constant control potential is applied to the positionable magnetic head so that is position is held fixed and the applied voltage is continuously monitored. Should the applied voltage vary from a permissible level a warning indication of a possible non-standard recording condition is produced or a feedback control system corrects the applied voltage. A separate fixed record head is no longer required since the reproduce head may now be used for the record head also.