| 摘要 |
<p>PHN. 8728 14-11-1977 Method and device for controlling the position of a write or read head, which covers adjacent tracks on a record carrier, relative to at least one adjacent track, which tracks in addition to the information signals contain tracking signals, the tracking signal in n consecutive tracks having n different frequencies, where n ? 4, and the difference of the frequencies of the tracking signals of every two adjacent tracks with the frequency of the third signal, which frequency may differ from track to track, always yielding fourth signals with the same pair of lower frequencies, a control signal being derived from said fourth signals.</p> |
