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Adaptive equalization in a sub-sampled read channel for a disk storage system

  • US 5,966,415 A
  • Filed: 06/13/1997
  • Issued: 10/12/1999
  • Est. Priority Date: 06/13/1997
  • Status: Expired due to Term
First Claim
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1. A sampled amplitude read channel for reading data recorded on a disk storage medium at a predetermine baud rate by detecting the recorded data from discrete-time sample values generated by sampling an analog read signal from a read head positioned over the disk storage medium, comprising:

  • (a) an analog filter for substantially bandlimiting a signal spectrum of the analog read signal to less than 90% of a bandwidth of a target partial response;

    (b) a sampling device for asynchronously sampling the analog read signal at less than 90% of the baud rate to generate the discrete-time sample values;

    (c) an adaptive equalizer, responsive to the discrete-time sample values, for generating equalized sample values according to the target partial response; and

    (d) a discrete-time sequence detector for detecting the recorded data from the equalized sample values.

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