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US 6,295,259 B1Granted
Method and apparatus for digitizing a signal read from a data storage medium into a binary value
AssigneeInternational Business Machines Corporation
InventorToshio Kanai
Life of this patent
Estimating the term…
Abstract
To more precisely digitize a signal read from a data storage medium into a binary value to reduce the rate of occurrence of bit error in reproduction. A phase difference of the intersecttion between a signal read from a data storage medium and a slice signal is evaluated to select a probable time cell in which the intersection should be contained for more precisely digitizing the read signal into a binary value.
Claims15
A method of digitizing a signal read from a data storage medium into a binary value comprising;
- a step of obtaining a period of a time cell from the frequency of the read signal,
- a step of detecting an intersection between the read signal and a slice signal,
- a step of selecting a time cell in which said intersection is contained,
- a step of evaluating the probability of the selected time cell and re-selecting a time cell in which said intersection should be contained, and
- a step of determining that said re-selected time cell is a bit “1”.
2 more elements
An apparatus for digitizing a signal read from a data storage medium into a binary value comprising;
- a circuit for generating a slice signal,
- a level comparator for slicing the read signal using the slice signal to detect the intersection between the read signal and the slice signal,
- a circuit for generating and controlling a time cell,
- a phase comparator for selecting a time cell in which the detected intersection is contained to detect a phase difference between the center of the time cell and the intersection, and
- an arithmetic evaluation circuit for evaluating the probability of the time cell in which the intersection is contained using the detected phase difference to select a time cell in which the intersection should be contained.
2 more elements
Dependencies are inferred from the claim text.