| 摘要 |
<p>Data that is recorded in a track on for example a magneto-optical disk and which contains a reference pattern that exhibits distinct amplitude levels is read from that disk by an optical hand and then gain controlled and offset controlled before being detected. Gain and offset control values are calculated from the upper and lower amplitude levels in the reference pattern read from the disk, and are fed back to gain and offset control circuits. As a result, data that is read by the optical head is reproduced with proper gain and offset. <IMAGE></p> |
