Sychronous read channel

  • US 5,991,107 A
  • Filed: 03/21/1997
  • Issued: 11/23/1999
  • Est. Priority Date: 02/01/1993
  • Status: Expired due to Term
First Claim
Patent Images

1. A synchronous read channel connected to receive an analog read signal from a read head positioned over a storage medium, the analog read signal comprising polarity alternating pulses representing data recorded on the storage medium, the synchronous read channel comprising:

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

    (b) a real time DC offset controller, responsive to the discrete time sample values, for generating an approximated DC offset value corresponding to a DC offset in the analog read signal;

    (c) a discrete time to analog converter for converting the approximated DC offset value into an analog DC offset value;

    (d) a subtraction circuit for subtracting the analog DC offset value from the analog read signal; and

    (e) a sequence detector for detecting an estimated data sequence from the discrete time sample values.

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