Zero phase restart interpolated timing recovery in a sampled amplitude read channel

  • US 5,835,295 A
  • Filed: 11/18/1996
  • Issued: 11/10/1998
  • Est. Priority Date: 11/18/1996
  • Status: Expired due to Term
First Claim
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1. A sampled amplitude read channel for detecting data stored on a storage medium by sampling pulses in an analog read signal emanating from a read head positioned over the medium, comprising:

  • (a) a sampling device for asynchronously sampling the analog read signal to generate a sequence of discrete time, asynchronous sample values;

    (b) interpolated timing recovery for generating a sequence of substantially synchronous sample values from the asynchronous sample values using an interpolation interval computed relative to a difference between the asynchronous sample values and synchronous sample values;

    (c) a zero phase restart circuit, responsive to the asynchronous sample values, for computing an initial interpolation interval at a beginning of an acquisition mode; and

    (d) a discrete time sequence detector for detecting the data from the substantially synchronous sample values,wherein the zero phase restart circuit comprises a processor for computing a sampling phase offset using a predetermined number of the asynchronous sample values, and the processor computes a real and imaginary component of the asynchronous sample values in the frequency domain.

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