| 摘要 |
<p>Tracking control signals are produced in response to the scanning of data tracks on a record medium (11), with at least alternate ones of those tracks containing tracking information signals recorded in predetermined areas. The tracks are scanned by a transducer arrangement comprising first and second heads (HL, HT) offset from each other in a direction substantially transverse of the tracks and displaced from each other in a direction substantially parallel to those tracks, such that the first and second heads (HL, HT) scan two tracks concurrently over the major portion of a scanning trace of each head (HL, HT). Tracking information signals picked up by the first and second heads (HL, HT) during a scanning trace are detected; and a tracking control signal indicative of a tracking error relative to the tracks being scanned is produced in response to the tracking information signals picked up by the two heads (HL, HT).</p> |
