| 摘要 |
Techniques and associated apparatus for recording and detecting data; and especially for detecting and processing recorded data with greater accuracy. Recording information (computer data bits) is recorded in "A-form" or "B-form" as oblique parallel marks along adjacent information strips (tracks) on a medium, using a "di-gap" transducer system comprising at least one related pair of transducer gaps aligned to register and sense information along a common record track, with the gaps being skewed oblique to the track direction, and aligned transverse to one another to register with respective A-form or B-form marks. One form of mark is preferably recorded along the ODD-number tracks, at a first frequency (f1) while the other form of mark is recorded along the EVEN-number tracks at a second, different frequency (f2). Output detect means are arranged to distinguish between these frequencies for improved recording (-e.g., head-position-servo control).
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