Data storage device comprising two-dimensional data dependent noise whitening filters for two-dimensional recording

摘要

A data storage device is disclosed wherein a first 2D data dependent noise whitening (DDNW) filter is configured to perform 2D DDNW of first and second 2D equalized samples to generate first 2D noise whitened samples. A second 2D DDNW filter is configured to perform 2D DDNW of the first and second 2D equalized samples to generate second 2D noise whitened samples. A 2D sequence detector is configured to detect a first data sequence recorded in a first data track from the first and second 2D noise whitened samples and to detect a second data sequence recorded in a second data track from the first and second 2D noise whitened samples.

主权项

1. A data storage device comprising:
a disk comprising a plurality of data tracks; a head actuated over the disk, wherein the head comprises a first read element and a second read element; and control circuitry operable to:
position the first read element over a first data track k−1 and position the second read element over a second data track k;sample a first read signal from the first read element to generate first signal samples;sample a second read signal from the second read element to generate second signal samples;a first two-dimensional (2D) equalizer configured to perform 2D equalization of the first signal samples and the second signal samples to generate first 2D equalized samples;a second 2D equalizer configured to perform 2D equalization of the first signal samples and the second signal samples to generate second 2D equalized samples;a first 2D data dependent noise whitening (DDNW) filter configured to perform 2D DDNW of the first and second 2D equalized samples to generate first 2D noise whitened samples;a second 2D DDNW filter configured to perform 2D DDNW of the first and second 2D equalized samples to generate second 2D noise whitened samples; anda 2D sequence detector configured to detect a first data sequence recorded in the first data track from the first and second 2D noise whitened samples and to detect a second data sequence recorded in the second data track from the first and second 2D noise whitened samples.