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Timing based servo system for magnetic tape systems

  • US 5,689,384 A
  • Filed: 06/30/1994
  • Issued: 11/18/1997
  • Est. Priority Date: 06/30/1994
  • Status: Expired due to Term
First Claim
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1. A servo control system for positioning a magnetic head adjacent a surface of a moving magnetic storage medium for reading a servo pattern recorded in at least one track on the storage medium surface, the system comprising:

  • a head assembly having at least one servo read head for reading the servo pattern on the storage medium in a transducing direction and generating a read head signal representative of the servo pattern;

    a servo decoder that receives the read head signal and decodes it to generate a position signal that indicates the position of the read head relative to the servo pattern;

    a translation assembly that is activated to position the head assembly relative to the storage medium; and

    a servo controller that activates the translation assembly in accordance with the position signal;

    the servo decoder including means for decoding a read head signal produced from a servo pattern that comprises a cyclic sequence of magnetic flux transitions that extend continuously across the width of the track and define servo pattern stripes such that the servo read head signal varies as the magnetic head is moved across the width of the track, the stripes including at least a first azimuthal orientation and a second azimuthal orientation, such that the first azimuthal orientation is not parallel to the second azimuthal orientation, and the servo decoder includes means for determining time intervals between a plurality of predetermined pairs of transitions in the servo pattern and generating a substantially speed invariant position signal that is a function of the time intervals.

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