Frequency-based approach for detection and classification of...

Details Frequency-based approach for detection and classification of... Frequency-based approach for detection and classification of...

2010-02-18

2011-10-04

Negron, Daniell L (Department: 2627)

Dynamic magnetic information storage or retrieval

Monitoring or testing the progress of recording

C360S025000

Reexamination Certificate

active

08031420

ABSTRACT:
In a hard-disc drive read channel, frequency-based measures are generated at two different data frequencies (e.g., 2T and DC) by applying a transform, such as a discrete Fourier transform (DFT), to signal values, such as ADC or equalizer output values, corresponding to, e.g., a 2T data pattern stored on the hard disc. The frequency-based measures are used to detect defect regions on the hard disc and/or to classify defect regions as being due to either thermal asperity (TA) or drop-out media defect (MD).

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