Coded data generation or conversion – Digital code to digital code converters – To or from run length limited codes
Patent
1998-05-13
1999-08-10
Williams, Howard L.
Coded data generation or conversion
Digital code to digital code converters
To or from run length limited codes
360 48, 371 4015, H03M 1312
Patent
active
059365587
ABSTRACT:
Data is detected from a disc in a disc drive and provided as a sampled read signal including data samples provided in a plurality of time intervals. A signal space detector is configured to detect the data, wherein the data is encoded according to a code having a time varying maximum transition run constraint which varies between a first and a second constraint over a plurality of time intervals. The detector is configured to receive an input sample including a first plurality of terms indicative of one of a plurality of possible data symbols. One of the plurality of possible data symbols is eliminated based on the first constraint when the input sample then being detected is constrained by the first constraint, to provide a second plurality of remaining possible data symbols. An estimated data value is determined which corresponds to the input sample then being detected, by determining which of the second plurality of remaining possible data symbols is within a predetermined range of the input symbol.
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Rub Bernardo
Shafiee Hamid R.
Seagate Technology Inc.
Williams Howard L.
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