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Cost reduced interpolated timing recovery in a sampled amplitude read channel

  • US 5,760,984 A
  • Filed: 10/20/1995
  • Issued: 06/02/1998
  • Est. Priority Date: 10/20/1995
  • Status: Expired due to Term
First Claim
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1. A sampled amplitude read channel for reading information stored on a magnetic medium by detecting digital data from a sequence of discrete time interpolated sample values, the interpolated sample values generated by interpolating a sequence of discrete time channel sample values generated by sampling pulses in an analog read signal from a magnetic read head positioned over the magnetic medium, the sampled amplitude read channel comprising:

  • (a) a sampling clock;

    (b) a sampling device, responsive to the sampling clock, for sampling the analog read signal to generate the channel sample values;

    (c) an interpolated timing recovery circuit, responsive to the channel sample values and an interpolation interval τ

    , for generating the interpolated sample values using an interpolation filter having an actual impulse response h(n) comprised of a number of actual coefficients computed in real time as a function of τ and

    a matrix of predetermined values Gi (n), wherein;

    i equals 1 to L where L determines a degree that the actual coefficients approximate ideal coefficients;

    n equals 1 to N where N is the number of actual coefficients in the actual impulse response h(n);

    the ideal coefficients are represented by a matrix A;

    the function of τ

    is a lookup table into a matrix F; and

    the matrix F is a factor of a rank reduced approximation of matrix A; and

    (d) a discrete time detector for detecting the digital data from the interpolated sample values.

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