Method and apparatus for determining equalized signal-to-noise ratio in a storage device
First Claim
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1. A method of determining an equalized signal-to-noise ratio in a storage device, the method comprising steps of:
- (a) generating an analog read signal;
(b) passing the analog signal through an equalizer in the storage device to produce an equalized signal;
(c) sampling the equalized signal using an analog to digital converter in the storage device to produce equalized samples; and
(d) calculating the equalized signal-to-noise ratio based on the equalized samples.
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Abstract
A method and data storage device determine an equalized signal-to-noise ratio in the storage device. The equalized signal-to-noise ratio is determined by generating an analog read signal, passing the read signal through an equalizer in the storage device, and sampling the equalized signal using an analog-to-digital converter in the storage device. The samples from the analog-to-digital converter are then used in the equalized signal-to-noise calculation.
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Citations
18 Claims
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1. A method of determining an equalized signal-to-noise ratio in a storage device, the method comprising steps of:
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(a) generating an analog read signal;
(b) passing the analog signal through an equalizer in the storage device to produce an equalized signal;
(c) sampling the equalized signal using an analog to digital converter in the storage device to produce equalized samples; and
(d) calculating the equalized signal-to-noise ratio based on the equalized samples. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A data storage device for reading data from a medium, the data storage device comprising:
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a head for generating an analog signal based on data stored on a medium;
an equalizer that equalizes the analog signal to form an equalized signal;
an analog-to-digital converter that samples the equalized signal to generate plurality of samples;
a selector that selects a sample from the plurality of samples and provides the selected sample to a data buffer; and
an equalized signal-to-noise ratio calculator that calculates an equalized signal-to-noise ratio based on the samples in the data buffer. - View Dependent Claims (11, 12, 13)
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14. A data storage device for retrieving data from a recording medium, the data storage device comprising:
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a read head and read channel for generating equalized data samples from data stored on the recording medium; and
equalized signal-to-noise ratio calculating means coupled to the read channel for determining an equalized signal-to-noise ratio from the equalized data samples. - View Dependent Claims (15, 16, 17, 18)
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Specification