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Patent Application Titled "Noise Predictive Filter Adaptation for Inter-Track Interference Cancellation" Published Online

September 9, 2014



By a News Reporter-Staff News Editor at Information Technology Newsweekly -- According to news reporting originating from Washington, D.C., by VerticalNews journalists, a patent application by the inventors Xiao, Jun (Fremont, CA); Park, Jongseung (Allentown, US); Zhang, Fan (Milpitas, CA); Djurdjevic, Ivana (US), filed on February 26, 2013, was made available online on August 28, 2014.

The assignee for this patent application is Lsi Corporation.

Reporters obtained the following quote from the background information supplied by the inventors: "Data storage systems often store data arranged in tracks. FIG. 1a shows a storage medium 101 with two exemplary tracks 151, 156 indicated as dashed lines. The tracks are segregated by servo data written within wedges 161, 166 (i.e., servo wedges). These wedges include data and supporting bit patterns 111 that are used for control and synchronization of the read/write head assembly over a desired location on storage medium 101. In particular, these wedges generally include a preamble pattern 192 followed by a sector address mark 194 (SAM). Sector address mark 194 is followed by a Gray code 196, and Gray code 196 is followed by burst information 198. It should be noted that while two tracks and two wedges are shown, hundreds of each would typically be included on a given storage medium. User data is stored at bit period locations between successive servo wedges. FIG. 1b shows an existing track to track layout 100 of data on a storage medium. Of note, track to track layout 100 includes only some of the data across some of the tracks that would be expected on an existing storage medium. As shown, layout 100 includes a number of tracks 105, 110, 115, 120, 125. Each of the tracks includes a synchronization pattern 150 (i.e., sync data 1, sync data 2, sync data 3, sync data 4, sync data 5) followed by bit periods of user data 155, 160, 165, 170, 175, 180, 185, 190. The bit periods each include magnetic information corresponding to data for a given bit period. As the density of the bit periods increase, magnetic information from one bit period will interfere or be combined with magnetic information from surrounding bit periods. This includes interaction from bit periods in one track with bit periods in prior and subsequent tracks. Failure to properly account for inter-track interference results in diminished accuracy of read back data."

In addition to obtaining background information on this patent application, VerticalNews editors also obtained the inventors' summary information for this patent application: "Various embodiments of the present invention provide systems and methods for data processing, and more particularly to systems and methods for adapting noise predictive filters for inter-track interference cancellation in a data processing system.

"A data processing system is disclosed including a first noise predictive filter circuit operable to filter digital data, a first data detector circuit operable to apply a data detection algorithm to an output of the first noise predictive filter circuit to yield a detected output, an inter-track interference cancellation circuit operable to reduce inter-track interference in the digital data based in part on the first detected output to yield cleaned data, a second noise predictive filter circuit operable to filter the cleaned data, and an adaptation circuit operable to generate filter coefficients for the second noise predictive filter circuit based in part on the cleaned data and on a signal derived from an output of the second noise predictive filter circuit.

"This summary provides only a general outline of some embodiments of the invention. The phrases 'in one embodiment,' 'according to one embodiment,' 'in various embodiments', 'in one or more embodiments', 'in particular embodiments' and the like generally mean the particular feature, structure, or characteristic following the phrase is included in at least one embodiment of the present invention, and may be included in more than one embodiment of the present invention. Importantly, such phrases do not necessarily refer to the same embodiment. This summary provides only a general outline of some embodiments of the invention. Additional embodiments are disclosed in the following detailed description, the appended claims and the accompanying drawings.

BRIEF DESCRIPTION OF THE FIGURES

"A further understanding of the various embodiments of the present invention may be realized by reference to the figures which are described in remaining portions of the specification. In the figures, like reference numerals may be used throughout several drawings to refer to similar components. In the figures, like reference numerals are used throughout several figures to refer to similar components.

"FIG. 1a depicts an existing storage medium including servo data;

"FIG. 1b depicts an existing track to track layout of data on a storage medium;

"FIG. 2 depicts a data processing system with noise predictive filter adaptation using data samples with inter-track interference cancellation in accordance with some embodiments of the present invention;

"FIG. 3 depicts a data processing system with noise predictive filter adaptation using data samples both with and without inter-track interference cancellation in accordance with some embodiments of the present invention;

"FIG. 4 is a flow diagram showing a method for noise predictive filter adaptation using data samples with inter-track interference cancellation in accordance with some embodiments of the present invention;

"FIG. 5 is a flow diagram showing a method for noise predictive filter adaptation using data samples both with and without inter-track interference cancellation in accordance with some embodiments of the present invention;

"FIG. 6 is a flow diagram showing a method for noise predictive filter re-adaptation using data samples with inter-track interference cancellation in accordance with some embodiments of the present invention; and

"FIG. 7 depicts a storage system including a read channel with noise predictive filtering adaptation for inter-track interference cancellation in accordance with various embodiments of the present invention."

For more information, see this patent application: Xiao, Jun; Park, Jongseung; Zhang, Fan; Djurdjevic, Ivana. Noise Predictive Filter Adaptation for Inter-Track Interference Cancellation. Filed February 26, 2013 and posted August 28, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=4566&p=92&f=G&l=50&d=PG01&S1=20140821.PD.&OS=PD/20140821&RS=PD/20140821

Keywords for this news article include: Information Technology, Information and Data Processing, Lsi Corporation.

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Source: Information Technology Newsweekly


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