| 摘要 |
<p>Transducer head tracking is provided in a replay unit (12) relative to a prerecorded medium (10) having at least one track which includes simultaneously occuring information disposed thereon forming a chevron pattern. Separate transducers (16, 18) are disposed within the head (14) for concurrently reproducing the simultaneous information when the head is properly aligned with the track of the prerecorded medium. An error signal is derived in proportion to the phase difference (Y-Z) existing between the reproducing of the simultaneous information form each side of the chevron pattern when the head is misaligned. The error signal is then applied to reduce the existing phase difference and any head misalignment therewith. The phase error signal is produced by comparison of a delayed pulse (triggered by one head) with a ramp signal (triggered by the other), and correction may be by movement of the head or adjustment of the speed of the medium (for cross-tracks on the medium as in helical scan recorders). <IMAGE></p> |
