| 摘要 |
A system for detecting an error in the step-by-step movements of magnetic heads for a recording and reproducing apparatus using a rotary magnetic medium. A plurality of magnetic heads are alternately moved intermittently in a predetermined cycle over the rotary magnetic medium, from its marginal portion to its central portion and return, for example. The recording or reproducing is a continuous video signal recorded on a number of concentric circular tracks. The magnetic heads are moved in step-by-step motion. The recording magnetic head remains stationary over the rotating medium, each field or each frame of the video signal being recorded in one of the circular tracks. The inventive system enables a ready detection, and it indicates and corrects an error in the step-by-step movements of the magnetic heads.
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