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Synchronous read channel employing an expected sample value generator for acquiring a preamble

  • US 5,754,352 A
  • Filed: 08/22/1996
  • Issued: 05/19/1998
  • Est. Priority Date: 09/27/1994
  • Status: Expired due to Term
First Claim
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1. A timing recovery circuit in a synchronous read channel utilized in reading data from a magnetic medium, said synchronous read channel detects digital data from a sequence of discrete time sample values Y(n) generated by sampling pulses in an analog signal from a magnetic read head positioned over the magnetic medium, said timing recovery circuit for adjusting the phase and frequency of a sampling clock signal relative to the phase and frequency of the pulse data, said timing recovery circuit comprises a phase detector circuit comprising:

  • (a) a timing gradient circuit for generating a timing gradient value .increment.t(n) representing a minimum mean squared error between the discrete time sample values Y(n) and a corresponding a priori sequence of expected sample values X(n) corresponding to sample values of a known acquisition preamble; and

    (b) an expected sample value generator for generating the a prior sequence of expected sample values X(n), wherein at least one of the expected sample values X(n) is generated independent from the discrete time sample values.

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