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1.发明专利
公开(公告)号：JP2006351170A
公开(公告)日：2006-12-28
申请号：JP2006155988
申请日：2006-06-05
Applicant: IBM
Inventor： JOSEPHINE FAITH BAYANG , ERNEST STEWART GALE , SWANSON DAVID LEE
Abstract: PROBLEM TO BE SOLVED: To provide a device, a reading channel, a magnetic tape drive, and service rendering device and method, capable of reducing the distortion of a reading signal from a magneto-resistive reading head. SOLUTION: A reading signal is supplied to a reading channel equipped with an analog-digital converter and a digital equalizer. A digital peak measuring device is configured to sense the output of the digital equalizer and to supply the average positive and negative peak values of the outputs. A controller is configured to repeatedly determine the asymmetry of the peak values in response to the peak values, to estimate the cancellation slope and the cancellation term relation of the asymmetry, to repeatedly estimate a converged cancellation term from the measured asymmetry and the estimated cancellation slope, and to feedback the converged cancellation term to change the digital reading signal regarding the input of the digital equalizer thereby converging the asymmetry to substantially 0. COPYRIGHT: (C)2007,JPO&INPIT
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公开(公告)号：GB2558416B
公开(公告)日：2019-02-27
申请号：GB201720581
申请日：2017-12-11
Applicant: IBM
Inventor： ROY DARON CIDECIYAN , SIMEON FURRER , ERNEST STEWART GALE , MARK ALFRED LANTZ
Abstract: In one embodiment, a method includes reading a plurality of narrow-spread (NS) codewords from M tracks of a magnetic tape medium using a plurality of read elements, the plurality of NS codewords collectively comprising data logically organized as a predetermined number of two-dimensional arrays. Each two-dimensional array includes a predetermined number of NS codewords positioned orthogonally to a predetermined number of wide-spread (WS) codewords, with a first NS codeword from a first two-dimensional array being read in its entirety from the magnetic tape medium prior to reading a second NS codeword from the first two-dimensional array. The method also includes laterally decoding each NS codeword from the first two-dimensional array read from the M tracks of the magnetic tape medium in succession prior to decoding any WS codewords from the first two-dimensional array. The NS codewords are protected with a stronger encoding than the WS codewords within each two-dimensional array.
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公开(公告)号：GB2558416A
公开(公告)日：2018-07-11
申请号：GB201720581
申请日：2017-12-11
Applicant: IBM
Inventor： ROY DARON CIDECIYAN , SIMEON FURRER , ERNEST STEWART GALE , MARK ALFRED LANTZ
Abstract: A method includes reading a plurality of narrow-spread (NS) codewords 812 from M tracks of a magnetic tape medium 802 using a plurality of read elements, the plurality of NS codewords collectively comprising data logically organized as a predetermined number of two-dimensional arrays. Each two-dimensional array includes a predetermined number of NS codewords positioned orthogonally to a predetermined number of wide-spread (WS) codewords 810, with a first NS codeword from a first two-dimensional array 804 being read in its entirety from the magnetic tape medium prior to reading a second NS codeword from the first two-dimensional array. The method also includes laterally decoding each NS codeword from the first two-dimensional array read from the M tracks of the magnetic tape medium in succession prior to decoding any WS codewords from the first two-dimensional array. The NS codewords are protected with a stronger encoding than the WS codewords within each two-dimensional array. The lower latency from decoding the NS codewords can be used to drive decision-directed digital front-end functions of read channels such as asymmetry cancellation, adaptive equalization, interpolation and gain adjustment.
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