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公开(公告)号：JPH11317028A
公开(公告)日：1999-11-16
申请号：JP1266999
申请日：1999-01-21
Applicant: IBM
Inventor： HUTCHINS ROBERT ALLEN , JAQUETTE GLEN ALAN , TSURUTA KAZUHIRO
IPC: G11B7/0037 , G11B7/005 , G11B19/28 , G11B20/10 , G11B20/14 , G11B19/247
Abstract: PROBLEM TO BE SOLVED: To provide a frequency controlling device with digital edge processor for estimating center frequencies of recorded signals having known formats of data recorded on a CLV optical disk or a magnetic tape or the like. SOLUTION: A read-in channel 110 includes a sampling detector 118 which supplies an edge position signal (PAT) indicating positions or recorded pulse edges by sampling a recorded signal at a known rate. An edge pattern identifying device being in a frequency controlling device 65 detects whether the edge signal of the recorded signal matches a presribed element of known format or not. There are, for example, a pulse having a prescribed length in which edges are opened with a prescribed interval, a prescribed pulse pattern or a pulse or a pattern having a known position in examples of the prescribed elements. An interval counter is connected to the pattern identifying device and measures the length of the interval between edges of a coincident pulse or pattern by making the length of a sample a unit.
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公开(公告)号：JPH10334435A
公开(公告)日：1998-12-18
申请号：JP12451598
申请日：1998-05-07
Applicant: IBM
Inventor： THOMAS ROBERT ALBRECH , ROBERT CARL BARRETT , JAMES HOWARD EATON , HUTCHINS ROBERT ALLEN , GLENN ALAN JACATTA
Abstract: PROBLEM TO BE SOLVED: To superimpose address specifying data information upon previously recorded track following servo information by shifting at least two transitions of a repeat transition couple in the parallel direction to transitions other than this repeat transition couple and including the address specifying information to be superimposed with the shift transitions. SOLUTION: A servo read head 26 is smaller than the width of a servo track 27, and a magnetic tape 20 is moved across a tape head assembly 24 in the horizontal direction. On the occurrence of this movement, a servo pattern of magnetic flux transition is detected by the servo read head 26, where an analog servo read signal is generated, and is changed into a position signal by a signal decoder 36 via a servo signal line 34 and is then sent to a servo control device 40 by a position signal line 38, from which a servo control signal is sent to a servo positioning mechanism of the head assembly 24 by a control line 42. Then, the head assembly 24 including the servo reading head 26 is moved vertically to a center line 30 of the servo track or the servo read head 26 is moved to the middle with respect to the center line 30.
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公开(公告)号：DE112016003638T5
公开(公告)日：2018-05-03
申请号：DE112016003638
申请日：2016-11-29
Applicant: IBM
Inventor： HUTCHINS ROBERT ALLEN , BENTLEY STEVEN ROSS , TANAKA KEISUKE , CIDECIYAN ROY DARON
IPC: H03M13/00
Abstract: In einer Ausführungsform enthält ein System einen Controller und eine Logik, die in den Controller integriert und/oder von diesem ausführbar ist. Die Logik ist zum Ausführen einer iterativen Decodierung von verschlüsselten Daten konfiguriert, um entschlüsselte Daten zu erhalten. In der iterativen Decodierung werden mindestens drei Decodierungsoperationen ausgeführt, wobei die Decodierungsoperationen aus einer Gruppe ausgewählt werden, aufweisend: C1-Decodierung und C2-Decodierung. Die Logik ist außerdem zum Ausführen einer der Decodierung nachfolgenden Fehlerdiagnose an einem ersten Abschnitt der entschlüsselten Daten konfiguriert in Reaktion darauf, dass nach der iterativen Decodierung der verschlüsselten Daten kein gültiges Produktcodewort in dem ersten Abschnitt erhalten wurde. Weitere Systeme, Verfahren und Computerprogrammprodukte zum Erzeugen von einer Decodierung nachfolgenden Fehlersignaturen werden gemäß weiteren Ausführungsformen vorgestellt.
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公开(公告)号：GB2495356B
公开(公告)日：2016-01-27
申请号：GB201212290
申请日：2012-07-11
Applicant: IBM
Inventor： CHERUBINI GIOVANNI , JELITTO JENS , HUTCHINS ROBERT ALLEN
Abstract: An apparatus according to one embodiment includes a digital correlator configured to compute a correlation signal between a sequence of samples of a readback servo signal and a reference waveform. A timing reference module is configured to provide a reference timing model comprising one or more interpolation instants to the digital correlator, wherein the correlation signal determined at each interpolation instant yields a detection metric for one data symbol. A correlation interpolator is configured to interpolate the correlation signal at the interpolation instants and compute a longitudinal position (LPOS) detection metric according to the interpolated correlation signal samples.
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公开(公告)号：GB2484229A
公开(公告)日：2012-04-04
申请号：GB201200295
申请日：2010-06-02
Applicant: IBM
Inventor： JELITTO JENS , CHERUBINI GIOVANNI , HUTCHINS ROBERT ALLEN , SANDBERG MELANIE JEAN
Abstract: A method for monitoring a plurality of servo channels, providing a finite state machine ("FSM") comprising a single servo channel mode and a combined servo channel mode, and moving a sequential information storage medium comprising a plurality of servo bands across a read/write head comprising a corresponding plurality of servo sensors. The method further asserts an acquisition flag by a servo channel if that servo channel is tracking a servo pattern, and asserts a bit flag by a servo channel if a new LPOS bit is decoded. If at least one acquisition flag is asserted, the method determines if a bit flag is asserted by a servo channel associated with said asserted acquisition flag, and if an acquisition flag and a bit flag are asserted by a servo channel, the method determines a relative positioning of each servo sensor with respect to an associated servo pattern.
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Patent Agency Ranking
公开(公告)号：CA2871865C
公开(公告)日：2021-01-26
申请号：CA2871865
申请日：2013-05-15
Applicant: IBM
Inventor： CIDECIYAN ROY DARON , HUTCHINS ROBERT ALLEN , MITTELHOLZER THOMAS , OELCER SEDAT
Abstract: In one embodiment, a data storage system includes a write channel for writing data to a storage medium, the write channel configured to utilize a partial reverse concatenated modulation code. The write channel includes logic adapted for encoding data sets using a C2 encoding scheme, logic adapted for adding a header to each subunit of the data sets, logic adapted for encoding the headers of the data sets with a first modulation encoding scheme, logic adapted for encoding data portions of the data sets with a second modulation encoding scheme, logic adapted for encoding portions of the one or more C2-encoded data sets using a C1 encoding scheme, logic adapted for combining the C1-encoded portions with the modulation-encoded headers of the C2-encoded data sets using a multiplexer, and logic adapted for writing the one or more combined C1- and C2-encoded data sets to data tracks.
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17.发明专利
公开(公告)号：DE112012004886B4
公开(公告)日：2016-06-23
申请号：DE112012004886
申请日：2012-11-09
Applicant: IBM
Inventor： HUTCHINS ROBERT ALLEN , OELCER SEDAT , GALE ERNEST STEWART , CHRISTENSEN ERIC ROLF
IPC: G11B5/035
Abstract: Verfahren, um auszuwählen, welche Tap-Koeffizienten (H0, ..., H16) eines programmierbaren Equalizers (108) mit endlicher Impulsantwort (FIR) festzusetzen sind, wobei das Verfahren aufweist: Durchführen (402) einer anfänglichen Kalibrierung, um einen Anfangswert für jeden Tap-Koeffizienten eines FIR-Equalizers zu ermitteln; Erzeugen eines ersten Signalverlaufs (500) durch Interpolation der Impulsantwort des adaptiven FIR-Filters unter Verwendung der Anfangswerte, wobei der Verlauf des ersten Signals eine Anzahl von Spitzen enthält, deren jeweilige Höhen dem betreffenden Anfangswert entsprechen; Durchführen einer Faltungs-Operation mit einer sinc-Funktion am ersten Signalverlauf, um einen zweiten Signalverlauf (502) zu erzeugen, der eine modifizierte Version des ersten Signalverlaufs darstellt, wobei der zweite Signalverlauf eine Vielzahl von Schleifen aufweist; Analysieren des zweiten Signalverlaufs, um mindestens eine Schleife des zweiten Signalverlaufs zu ermitteln, welche die größte Fläche besitzt; und Festsetzen des Koeffizienten von mindestens einem Tap, welcher der mindestens einen Schleife am nächsten liegt.
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公开(公告)号：GB2524426A
公开(公告)日：2015-09-23
申请号：GB201511838
申请日：2013-12-17
Applicant: IBM
Inventor： CIDECIYAN ROY DARON , HUTCHINS ROBERT ALLEN , MITTELHOLZER THOMAS , TANAKA KEISUKE
Abstract: A method includes receiving a headerized SDS protected by unequal error protection; decoding a header from the headerized SDS and removing an impact of the header from C1 row parity to obtain a SDS; for a number of iterations: performing C2 column decoding, for no more than a number of interleaves in each row of the SDS: overwriting a number of columns with successfully decoded C2 codewords, erasing a number of C2 codewords, and maintaining remaining columns as uncorrected, performing CI row decoding; for no more than a number of interleaves in each row of the SDS: overwriting a number of rows with successfully decoded C1 codewords, erasing a number of C1 codewords, and maintaining remaining rows as uncorrected; and outputting the SDS when all rows include only CI codewords and all columns include only C2 codewords; otherwise, outputting indication that the SDS cannot decoded properly.
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公开(公告)号：GB2496935A
公开(公告)日：2013-05-29
申请号：GB201214206
申请日：2012-08-09
Applicant: IBM
Inventor： HUTCHINS ROBERT ALLEN , OELCER SEDAT , GALE ERNEST STEWART , CHRISTENSEN ERIC ROLF
Abstract: The adaptive equaliser in the read channel of a tape drive may not always converge to the best configuration. Convergence to a set of tap coefficients giving a good signal-to-noise ratio is more likely if a small set of selected adjacent taps, for example four of seventeen taps, are fixed at the outset rather than being adaptive in operation. Initial tap values are determined during an initial calibration and a waveform 502 is then derived by convolving an interpolated (upsampled) version 500 of the equalisers impulse response with a sinc function. Those taps closest to the waveform lobe or lobes having the largest area are fixed and the other taps remain adaptive in operation. Initial calibration may involve adapting the equaliser while reading calibration data or simply setting the tap coefficients to values read from the tape or another location.
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公开(公告)号：SG70149A1
公开(公告)日：2000-01-25
申请号：SG1999000142
申请日：1999-01-22
Applicant: IBM
Inventor： HUTCHINS ROBERT ALLEN , JAQUETTE GLEN ALAN , TSURUTA KAZUHIRO
Abstract: Disclosed is a digital edge processor frequency control for estimating the center frequency of a recorded signal having a known format, such as data recorded on a CLV optical disk or on magnetic tape. The read channel includes a sampling detector which samples the recorded signal at a known rate to provide edge position signals (PAT) indicating the location of recorded pulse edges. An edge pattern identifier detects whether the edge signals of the recording signal match a predetermined element of the known format. Examples of predetermined elements include a pulse of a known length and whose edges are spaced a known distance, a predetermined pulse pattern, or a pulse or pattern at a known location. An interval counter is coupled to the pattern identifier for measuring the interval length between the edges of the matching pulse or pattern in units of the sample length. A center frequency estimator calculates the period of the center frequency of the matching edges by relating the matching edge interval length to a predetermined nominal wave length for the predetermined element of the known format. The result is a Tau that is used to establish the center frequency for the digital PLL.
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