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Researchers Submit Patent Application, "Read Channel Data Signal Detection with Reduced-State Trellis", for Approval

July 16, 2014



By a News Reporter-Staff News Editor at Electronics Newsweekly -- From Washington, D.C., VerticalNews journalists report that a patent application by the inventors Tan, Weijun (Longmont, CO); Wu, Xuebin (San Jose, CA); Yang, Shaohua (San Jose, CA), filed on December 20, 2012, was made available online on July 3, 2014.

The patent's assignee is LSI Corporation.

News editors obtained the following quote from the background information supplied by the inventors: "Disk-based storage devices such as hard disk drives (HDDs) are used to provide non-volatile data storage in a wide variety of different types of data processing systems. A typical HDD comprises a spindle which holds one or more flat circular storage disks, also referred to as platters. Each storage disk comprises a substrate made from a non-magnetic material, such as aluminum or glass, which is coated with one or more thin layers of magnetic material. In operation, data is read from and written to tracks of the storage disk via a read/write head that is moved precisely across the disk surface by a positioning arm as the disk spins at high speed."

As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventors' summary information for this patent application: "In one embodiment, an apparatus comprises read channel circuitry and signal processing circuitry associated with the read channel circuitry. The signal processing circuitry is configured to determine a first set of soft outputs, hard decisions and reliability indicators for a read channel data signal, to determine a second set of soft outputs, hard decisions and reliability indicators based at least in part on the first set of soft outputs, hard decisions and reliability indicators, and to perform an iterative decoding process to decode the read channel data signal based at least in part on the second set of soft outputs, hard decisions and reliability indicators. The first set of soft outputs, hard decisions and reliability indicators are used to determine a reduced-state trellis for determining the second set of soft outputs, hard decisions and reliability indicators.

"Other embodiments of the invention include, by way of example and without limitation, methods, storage devices, virtual storage systems, integrated circuits and computer-readable storage media having computer program code embodied therein.

BRIEF DESCRIPTION OF THE DRAWINGS

"FIG. 1 shows a disk-based storage device, according to an embodiment of the invention.

"FIG. 2 is a detailed view of portions of the read channel circuitry of FIG. 1, according to an embodiment of the invention.

"FIG. 3 is a detailed view of portions of the read channel circuitry of FIG. 1, according to an alternate embodiment of the invention.

"FIG. 4 is a detailed view of a detector, according to an embodiment of the invention.

"FIG. 5 is another detailed view of a detector, according to an embodiment of the invention.

"FIG. 6 is a flow diagram illustrating a methodology of reduced state detection, according to an embodiment of the invention.

"FIG. 7 shows a virtual storage system incorporating a plurality of disk-based storage devices of the type shown in FIG. 1, according to an embodiment of the invention."

For additional information on this patent application, see: Tan, Weijun; Wu, Xuebin; Yang, Shaohua. Read Channel Data Signal Detection with Reduced-State Trellis. Filed December 20, 2012 and posted July 3, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=413&p=9&f=G&l=50&d=PG01&S1=20140626.PD.&OS=PD/20140626&RS=PD/20140626

Keywords for this news article include: Electronics, LSI Corporation, Signal Processing.

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Source: Electronics Newsweekly


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