| 摘要 |
<p>The present invention relates to apparatus for reading and writing data to a storage medium, wherein the data is written to the medium in tracks, each track having a predetermined trigger signal pattern, the apparatus comprising: an adaptive filter (62) for signals read from the medium; and means for triggering adaptive filtering for a track of data on detection of the predetermined trigger signal pattern in that track. In this way, during a read operation adaptive filtering is triggered on commencement of data with spectral characteristics suitable for adaption of the filter. In the embodiment to be described, each track comprises data fragments each having a header containing ancillary information wherein at least a header in an intitial data fragment in the track comprises the predetermined trigger signal pattern. Preferably, at least the header of the initial data fragment in the track comprises the predetermined trigger signal pattern. <IMAGE></p> |
