Specifics Of Equalizing Patents (Class 360/65)
  • Patent number: 10915388
    Abstract: The data storage device includes a first memory having error correction capability, and a controller coupled to the first memory. The controller is configured to calculate an error count of the first memory. The controller is configured to report a message to a host when the controller determines that an alarm condition is satisfied. The alarm condition is related to the error count of the first memory and a threshold count.
    Type: Grant
    Filed: January 11, 2018
    Date of Patent: February 9, 2021
    Assignee: SILICON MOTION, INC.
    Inventors: Yi-Hua Pao, Wen-Chi Hu
  • Patent number: 10910012
    Abstract: According to one embodiment, a first decoding circuit calculates likelihood information by executing Viterbi decoding using a parameter for normalizing a branch metric on a signal sequence read from a magnetic disk. The second decoding circuit generates a first bit data sequence by iterative decoding using the likelihood information, and executes a check using a parity check matrix on the first bit data sequence. The control circuit causes the first decoding circuit and the second decoding circuit to repeatedly execute decoding, and updates the parameter in accordance with a check result obtained every time the decoding by the first decoding circuit and the second decoding circuit is executed. An acquisition circuit acquires numerical information corresponding to the number of bit errors included in the first bit data sequence obtained when the number of times of executions of the decoding is equal to a first value.
    Type: Grant
    Filed: February 28, 2020
    Date of Patent: February 2, 2021
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
    Inventors: Manabu Kobayashi, Akihiro Yamazaki
  • Patent number: 10755735
    Abstract: A magnetic tape apparatus, in which a tilt cos ? of the hexagonal ferrite powder with respect to a surface of the magnetic layer acquired by cross section observation by STEM is 0.85 to 1.00, a reading element unit includes a plurality of reading elements each of which reads data by a linear scanning method from a specific track region including a reading target track in a track region included in the magnetic tape, an extraction unit performs a waveform equalization process according to a deviation amount between positions of the magnetic tape and the reading element unit, with respect to each reading result for each reading element, to extract data derived from the reading target track from the reading result, and the deviation amount is determined in accordance with a result obtained by reading of the servo pattern included in the magnetic layer by a servo element.
    Type: Grant
    Filed: June 28, 2019
    Date of Patent: August 25, 2020
    Assignee: FUJIFILM Corporation
    Inventors: Eiki Ozawa, Norihito Kasada, Atsushi Musha
  • Patent number: 10686630
    Abstract: Embodiments are disclosed for channel estimation in a receiver of a communication system. An example method includes receiving, via a receiver of a communication system, an input signal. The example method further includes using a first event indicator embedded in an analog circuit of the receiver to slice the input signal to generate a sliced input signal and applying an offset to the input signal to generate an offsetted signal. The example method further includes using a second event indicator embedded in the analog circuit to slice the offsetted signal to generate a sliced offsetted signal. The example method further includes applying a first predefined delay to the sliced input signal and applying a second predefined delay to the sliced offsetted signal. The example method further includes generating a conditional ones signal based on the sliced input signal and the sliced offsetted signal and using the conditional ones signal to calibrate an equalizer embedded in the receiver.
    Type: Grant
    Filed: July 15, 2019
    Date of Patent: June 16, 2020
    Assignee: MELLANOX TECHNOLOGIES, LTD.
    Inventors: Eyal David, Shai Cohen, Johan Jacob Mohr, Daniel Kedar, Stanislav Gurtovoy, Ran Sela, Aviv Berg
  • Patent number: 10497390
    Abstract: Embodiments described herein provide methods and systems for correcting a transient phase error induced while recording on a magnetic recording medium. An input signal is received and is distributed to a plurality of sinc filters. A respective phase-shifted signal is generated at each of the plurality of sinc filters by adding a corresponding predetermined amount of phase to the received signals. A respective score is assigned to each of the generated phase-shifted signals. The generated phase-shifted signal having the highest score is selected as the phase-corrected signal to compensate for the transient phase error induced while recording on the magnetic recording medium.
    Type: Grant
    Filed: January 31, 2019
    Date of Patent: December 3, 2019
    Assignee: Marvell International Ltd.
    Inventors: Jongseung Park, Michael Madden
  • Patent number: 10469956
    Abstract: A MEMS transducer package comprising a substrate; a filter circuit for filtering RF signals, the filter circuit comprising a resistor and a capacitor; and an IPD chip; wherein at least a portion of the filter circuit is provided within the IPD chip.
    Type: Grant
    Filed: December 22, 2017
    Date of Patent: November 5, 2019
    Assignee: Cirrus Logic, Inc
    Inventors: Aleksey Sergeyevich Khenkin, David Patten, Dimitris Drogoudis
  • Patent number: 10460762
    Abstract: An apparatus may comprise a circuit configured to receive first underlying data corresponding to a first signal with a first rate and receive a second signal with a second rate corresponding to second underlying data. The circuit may interpolate the first underlying data to generate a plurality of interpolated signals, determine, for the first signal, a first channel pulse response shape with the first rate, and determine an interference component signal based on the plurality of interpolated signals and the first channel pulse response shape. The circuit may then cancel interference in the second signal using the interference component signal to generate a cleaned signal.
    Type: Grant
    Filed: September 4, 2018
    Date of Patent: October 29, 2019
    Assignee: Seagate Technology LLC
    Inventors: Zheng Wu, Jason Bellorado, Marcus Marrow, Vincent Brendan Ashe
  • Patent number: 10363483
    Abstract: A method of and system for handling latency issues encountered in producing real-time entertainment such as games of skill synchronized with live or taped televised events is described herein. There are multiple situations that are dealt with regarding latencies in receiving a television signal with respect to real-time entertainment based on the unfolding games played along with the telecasts. Systemic delays, arbitrarily imposed delays of a broadcast signal and variances in the precise broadcast times of taped television programs have to be equalized so as to provide fair entertainment.
    Type: Grant
    Filed: July 17, 2018
    Date of Patent: July 30, 2019
    Assignee: Winview, Inc.
    Inventors: David B. Lockton, Mark K. Berner, Mark J. Micheli, David Lowe
  • Patent number: 10279253
    Abstract: A method of and system for handling latency issues encountered in producing real-time entertainment such as games of skill synchronized with live or taped televised events is described herein. There are multiple situations that are dealt with regarding latencies in receiving a television signal with respect to real-time entertainment based on the unfolding games played along with the telecasts. Systemic delays, arbitrarily imposed delays of a broadcast signal and variances in the precise broadcast times of taped television programs have to be equalized so as to provide fair entertainment.
    Type: Grant
    Filed: May 22, 2018
    Date of Patent: May 7, 2019
    Assignee: WinView, Inc.
    Inventors: David B. Lockton, Mark K. Berner, Mark J. Micheli, David Lowe
  • Patent number: 10079701
    Abstract: A three-valued signal generation device includes a first differential amplifier that outputs a differential signal, a second differential amplifier that outputs a differential signal and an inverted differential signal in accordance with a level based on a reference voltage of an inverted pseudo LFPS signal, which is obtained by inverting a logic level of the pseudo LFPS signal, a first signal synthesis unit that synthesizes the differential signal from the first differential amplifier and the inverted differential signal from the second differential amplifier to perform positive logic output of a three-valued LFPS signal, and a second signal synthesis unit that synthesizes the inverted differential signal from the first differential amplifier and the differential signal from the second differential amplifier to perform negative logic output of the three-valued LFPS signal.
    Type: Grant
    Filed: February 5, 2018
    Date of Patent: September 18, 2018
    Assignee: ANRITSU CORPORATION
    Inventor: Kazuhiro Yamane
  • Patent number: 10055272
    Abstract: Provided is a storage system which is connected to a host computer and whereby data is read and written. The storage system comprises: a storage device which stores the data; and a storage controller wherein an error is detected by one of a plurality of first sections which are sections upon a transfer path of the data with respect to the storage device in a full check mode, an error is detected by one of second sections which are fewer than the first sections in a regular mode, and a switch is made to the full check mode when the error is detected in the regular mode.
    Type: Grant
    Filed: October 24, 2013
    Date of Patent: August 21, 2018
    Assignee: HITACHI, LTD.
    Inventors: Yusuke Nishihara, Yuko Matsui, Shintaro Kudo
  • Patent number: 10052557
    Abstract: A method of and system for handling latency issues encountered in producing real-time entertainment such as games of skill synchronized with live or taped televised events is described herein. There are multiple situations that are dealt with regarding latencies in receiving a television signal with respect to real-time entertainment based on the unfolding games played along with the telecasts. Systemic delays, arbitrarily imposed delays of a broadcast signal and variances in the precise broadcast times of taped television programs have to be equalized so as to provide fair entertainment.
    Type: Grant
    Filed: May 23, 2017
    Date of Patent: August 21, 2018
    Assignee: Winview, Inc.
    Inventors: David B. Lockton, Mark K. Berner, Mark J. Micheli, David Lowe
  • Patent number: 9999834
    Abstract: A method of and system for handling latency issues encountered in producing real-time entertainment such as games of skill synchronized with live or taped televised events is described herein. There are multiple situations that are dealt with regarding latencies in receiving a television signal with respect to real-time entertainment based on the unfolding games played along with the telecasts. Systemic delays, arbitrarily imposed delays of a broadcast signal and variances in the precise broadcast times of taped television programs have to be equalized so as to provide fair entertainment.
    Type: Grant
    Filed: June 30, 2017
    Date of Patent: June 19, 2018
    Assignee: Winview, Inc.
    Inventors: David B. Lockton, Mark K. Berner, Mark J. Micheli, David Lowe
  • Patent number: 9973354
    Abstract: In certain embodiments, an apparatus may comprise a circuit configured to receive a plurality of samples of an input signal. The circuit may update one or more equalizer parameters using partial zero forcing equalization. Further, the circuit may generate an equalized signal based on the plurality of samples of the input signal and the one or more equalizer parameters.
    Type: Grant
    Filed: June 25, 2016
    Date of Patent: May 15, 2018
    Assignee: Seagate Technology LLC
    Inventors: William Michael Radich, Raman Venkataramani, Belkacem Derras, Rishi Ahuja
  • Patent number: 9919211
    Abstract: A method of and system for handling latency issues encountered in producing real-time entertainment such as games of skill synchronized with live or taped televised events is described herein. There are multiple situations that are dealt with regarding latencies in receiving a television signal with respect to real-time entertainment based on the unfolding games played along with the telecasts. Systemic delays, arbitrarily imposed delays of a broadcast signal and variances in the precise broadcast times of taped television programs have to be equalized so as to provide fair entertainment.
    Type: Grant
    Filed: July 12, 2017
    Date of Patent: March 20, 2018
    Assignee: Winview, Inc.
    Inventors: David B. Lockton, Mark K. Berner, Mark J. Micheli, David Lowe
  • Patent number: 9860581
    Abstract: A system is provided for enabling correlating timeline information between a first media stream and a second media stream, with the first media stream and the second media stream being both associated with a common play-out timeline. The system comprises at least two content monitors, each arranged for providing a persistent identification of one or more media samples of a media stream.
    Type: Grant
    Filed: September 5, 2014
    Date of Patent: January 2, 2018
    Assignees: KONINKLIJKE KPN N.V., NEDERLANDSE ORGANISATIE VOOR TOEGEPAST-NATUURWETENSCHAPPELIJK ONDERZOEK TNO
    Inventors: Hans Maarten Stokking, Mattijs Oskar Van Deventer, Ray Van Brandenburg
  • Patent number: 9786316
    Abstract: An apparatus for two-dimensional magnetic recording includes an array reader comprising a number of read sensors configured to read data from at least one track on a storage medium, a number of two-dimensional equalizer circuits each comprising inputs for receiving signals derived from each of the read sensors, each comprising an equalized output, and a number of iterative inter-track interference cancellation circuits, each operable to cancel inter-track interference in a different one of the equalized outputs from the two-dimensional equalizer circuits.
    Type: Grant
    Filed: December 2, 2015
    Date of Patent: October 10, 2017
    Assignee: AVAGO TECHNOLOGIES GENERAL IP (SINGAPORE) PTE. LTD.
    Inventors: George Mathew, Jongseung Park, Richard Rauschmayer, Bruce A. Wilson
  • Patent number: 9768800
    Abstract: An apparatus comprises a digital to analog converter (DAC) circuit configured to receive a time-varying a digital input signal and convert the digital input signal to an analog output signal, an output amplifier circuit operatively coupled to the output of the DAC circuit, a peak detector circuit operatively coupled to the input the DAC and configured to produce a signal envelope of the digital input signal, and logic circuitry. The logic circuitry is operatively coupled to the peak detector circuit and is configured to detect when the signal envelope satisfies a specified threshold value; and to adjust a drive capability of an output amplifier circuit of the DAC circuit according to the signal envelope.
    Type: Grant
    Filed: September 13, 2016
    Date of Patent: September 19, 2017
    Assignee: Analog Devices, Inc.
    Inventor: Khiem Quang Nguyen
  • Patent number: 9761267
    Abstract: According to one embodiment, a system for processing data includes a processor and logic integrated with and/or executable by the processor. The logic is configured to individually set, for each of one or more range-constrained finite impulse response (FIR) filter taps configured for use in a FIR filter, a predetermined range of values suitable for controlling an equalizer response. The logic is also configured to pass data through the equalizer comprising the FIR filter to obtain equalized data. Each of the one or more range-constrained FIR filter taps are individually adaptive within its predetermined range of values. Also, the data is read from a magnetic storage medium.
    Type: Grant
    Filed: March 31, 2016
    Date of Patent: September 12, 2017
    Assignee: International Business Machines Corporation
    Inventor: Robert A. Hutchins
  • Patent number: 9755730
    Abstract: A satellite communication system and a method of cancelling interference in the satellite communication system are disclosed. The method of cancelling interference in the satellite communication system may include receiving a signal by a central station from a terminal via a satellite transponder, estimating, from the signal, a nonlinear characteristic associated with a central station signal transmitted from the central station, and cancelling an interference signal from the signal using the estimated nonlinear characteristic.
    Type: Grant
    Filed: January 26, 2016
    Date of Patent: September 5, 2017
    Assignee: Electronics and Telecommunications Research Institute
    Inventor: Joon Gyu Ryu
  • Patent number: 9744453
    Abstract: A method of and system for handling latency issues encountered in producing real-time entertainment such as games of skill synchronized with live or taped televised events is described herein. There are multiple situations that are dealt with regarding latencies in receiving a television signal with respect to real-time entertainment based on the unfolding games played along with the telecasts. Systemic delays, arbitrarily imposed delays of a broadcast signal and variances in the precise broadcast times of taped television programs have to be equalized so as to provide fair entertainment.
    Type: Grant
    Filed: September 12, 2016
    Date of Patent: August 29, 2017
    Assignee: Winview, Inc.
    Inventors: David B. Lockton, Mark K. Berner, Mark J. Micheli, David Lowe
  • Patent number: 9724603
    Abstract: A method of and system for handling latency issues encountered in producing real-time entertainment such as games of skill synchronized with live or taped televised events is described herein. There are multiple situations that are dealt with regarding latencies in receiving a television signal with respect to real-time entertainment based on the unfolding games played along with the telecasts. Systemic delays, arbitrarily imposed delays of a broadcast signal and variances in the precise broadcast times of taped television programs have to be equalized so as to provide fair entertainment.
    Type: Grant
    Filed: August 26, 2016
    Date of Patent: August 8, 2017
    Assignee: Winview, Inc.
    Inventors: David B. Lockton, Mark K. Berner, Mark J. Micheli, David Lowe
  • Patent number: 9687739
    Abstract: A method of and system for handling latency issues encountered in producing real-time entertainment such as games of skill synchronized with live or taped televised events is described herein. There are multiple situations that are dealt with regarding latencies in receiving a television signal with respect to real-time entertainment based on the unfolding games played along with the telecasts. Systemic delays, arbitrarily imposed delays of a broadcast signal and variances in the precise broadcast times of taped television programs have to be equalized so as to provide fair entertainment.
    Type: Grant
    Filed: July 22, 2014
    Date of Patent: June 27, 2017
    Assignee: Winview, Inc.
    Inventors: David B. Lockton, Mark K. Berner, Mark J. Micheli, David Lowe
  • Patent number: 9687738
    Abstract: A method of and system for handling latency issues encountered in producing real-time entertainment such as games of skill synchronized with live or taped televised events is described herein. There are multiple situations that are dealt with regarding latencies in receiving a television signal with respect to real-time entertainment based on the unfolding games played along with the telecasts. Systemic delays, arbitrarily imposed delays of a broadcast signal and variances in the precise broadcast times of taped television programs have to be equalized so as to provide fair entertainment.
    Type: Grant
    Filed: June 3, 2014
    Date of Patent: June 27, 2017
    Assignee: Winview, Inc.
    Inventors: David B. Lockton, Mark K. Berner, Mark J. Micheli, David Lowe
  • Patent number: 9672692
    Abstract: To encourage viewer participation, games, contests and social interactions are able to be synchronized with programming such as television shows or commercials utilizing a second screen such as a cell phone, iPadĀ® or laptop computer. The programming is able to be television programming, Internet programming (e.g. a video displayed on a webpage or mobile device) or any other programming. The gaming is able to be any game such as a game of skill or chance, for example, a scavenger hunt or a treasure hunt.
    Type: Grant
    Filed: February 4, 2014
    Date of Patent: June 6, 2017
    Assignee: Winview, Inc.
    Inventor: David B. Lockton
  • Patent number: 9662577
    Abstract: A method of and system for handling latency issues encountered in producing real-time entertainment such as games of skill synchronized with live or taped televised events is described herein. There are multiple situations that are dealt with regarding latencies in receiving a television signal with respect to real-time entertainment based on the unfolding games played along with the telecasts. Systemic delays, arbitrarily imposed delays of a broadcast signal and variances in the precise broadcast times of taped television programs have to be equalized so as to provide fair entertainment.
    Type: Grant
    Filed: May 15, 2014
    Date of Patent: May 30, 2017
    Assignee: Winview, Inc.
    Inventors: David B. Lockton, Mark K. Berner, Mark J. Micheli, David Lowe
  • Patent number: 9662576
    Abstract: A method of and system for handling latency issues encountered in producing real-time entertainment such as games of skill synchronized with live or taped televised events is described herein. There are multiple situations that are dealt with regarding latencies in receiving a television signal with respect to real-time entertainment based on the unfolding games played along with the telecasts. Systemic delays, arbitrarily imposed delays of a broadcast signal and variances in the precise broadcast times of taped television programs have to be equalized so as to provide fair entertainment.
    Type: Grant
    Filed: March 19, 2014
    Date of Patent: May 30, 2017
    Assignee: Winview, Inc.
    Inventors: David B. Lockton, Mark K. Berner, Mark J. Micheli, David Lowe
  • Patent number: 9604140
    Abstract: A method of and system for handling latency issues encountered in producing real-time entertainment such as games of skill synchronized with live or taped televised events is described herein. There are multiple situations that are dealt with regarding latencies in receiving a television signal with respect to real-time entertainment based on the unfolding games played along with the telecasts. Systemic delays, arbitrarily imposed delays of a broadcast signal and variances in the precise broadcast times of taped television programs have to be equalized so as to provide fair entertainment.
    Type: Grant
    Filed: February 4, 2014
    Date of Patent: March 28, 2017
    Assignee: Winview, Inc.
    Inventors: David B. Lockton, Mark K. Berner, Mark J. Micheli, David Lowe
  • Patent number: 9549221
    Abstract: A signal switching apparatus includes multiple video image processing units, a controller configured to control operation of the video image processing units, and a graphical user interface (GUI) configured to receive input of a selection between an HD mode and a quartering-4K mode which are operation modes of the video image processing units. The controller controls the video image processing units so that the video image processing units operate in the HD mode or quartering-4K mode, on the basis of a selection inputted to the GUI.
    Type: Grant
    Filed: November 21, 2014
    Date of Patent: January 17, 2017
    Assignee: SONY CORPORATION
    Inventor: Shozo Into
  • Patent number: 9542972
    Abstract: Systems and method are disclosed relating generally to data processing, and more particularly to systems and methods for utilizing multiple data streams for data recovery from a storage device. One example of the system includes a first equalizer circuit, a second equalizer circuit, a summation circuit, a first multiplication circuit, a second multiplication circuit, and a scalar calculation circuit that is capable of calculating a scalar based upon coefficients that are also provided as inputs to the first equalizer and second equalizer.
    Type: Grant
    Filed: November 12, 2015
    Date of Patent: January 10, 2017
    Assignee: Avago Technologies General IP (Singapore) Pte. Ltd.
    Inventors: Aravind Ratnakar Nayak, Lu Lu, Richard Rauschmayer, Haitao Xia
  • Patent number: 9482702
    Abstract: Disclosed herein is a detection apparatus including: a resonant circuit provided with a Q-factor measurement coil and one or more capacitors to serve as a circuit for receiving pulses; a response-waveform detecting section configured to detect the waveform of a response output by the resonant circuit in response to the pulses; and a Q-factor measuring section configured to measure a Q factor of the resonant circuit from the response waveform detected by the response-waveform detecting section. It is possible to increase the precision of detection of a metallic foreign substance existing between a power transmitting side and a power receiving side.
    Type: Grant
    Filed: November 29, 2012
    Date of Patent: November 1, 2016
    Assignee: SONY CORPORATION
    Inventor: Shinji Komiyama
  • Patent number: 9457272
    Abstract: A method of and system for handling latency issues encountered in producing real-time entertainment such as games of skill synchronized with live or taped televised events is described herein. There are multiple situations that are dealt with regarding latencies in receiving a television signal with respect to real-time entertainment based on the unfolding games played along with the telecasts. Systemic delays, arbitrarily imposed delays of a broadcast signal and variances in the precise broadcast times of taped television programs have to be equalized so as to provide fair entertainment.
    Type: Grant
    Filed: July 22, 2014
    Date of Patent: October 4, 2016
    Assignee: Winview, Inc.
    Inventors: David B. Lockton, Mark K. Berner, Mark J. Micheli, David Lowe
  • Patent number: 9454428
    Abstract: There is provided an error correction method for a non-volatile memory. The method includes receiving a codeword read from the non-volatile memory, computing a reliability information for each bit of the codeword received, and performing a reduced-complexity soft-decision decoding (SDD) technique to decode the received codeword. In particular, the SDD technique includes forming a set of test patterns based on the reliability data, and determining whether to perform a HDD of a test pattern in the set of test patterns based on a distance between the test pattern and a candidate pattern. There is also provided an error correction module for a non-volatile memory and a memory system incorporating the error correction module.
    Type: Grant
    Filed: November 26, 2014
    Date of Patent: September 27, 2016
    Assignee: Agency for Science, Technology and Research
    Inventors: Kui Cai, Zhiliang Qin, Xueqiang Wang
  • Patent number: 9418698
    Abstract: According to one embodiment, a magnetic tape drive includes a controller configured to direct first data through a first finite impulse response (FIR) gain module in response to a determination that the first data is being read from a magnetic tape medium in an asynchronous mode to control FIR gain of the first data. The controller is also configured to direct second data through a second FIR gain module in response to a determination that the second data is being read from the magnetic tape medium in a synchronous mode to control FIR gain of the second data. A FIR gain value of the second FIR gain module is automatically controlled. Other systems for dynamic gain control with adaptive equalizers are described according to more embodiments.
    Type: Grant
    Filed: December 2, 2015
    Date of Patent: August 16, 2016
    Assignee: International Business Machines Corporation
    Inventors: Katherine T. Blinick, Robert A. Hutchins, Sedat Oelcer
  • Patent number: 9252989
    Abstract: A data dependent equalizer circuit includes a plurality of noise prediction filters. Respective ones of the noise prediction filters are configured to filter noise in sample data for at least one predetermined non-return to zero (NRZ) condition. A plurality of equalizers is communicatively coupled with the plurality of noise prediction filters. Respective ones of the plurality of equalizers are configured to yield equalized sample data that corresponds to the at least one predetermined NRZ condition for one or more of the noise prediction filters.
    Type: Grant
    Filed: September 27, 2012
    Date of Patent: February 2, 2016
    Assignee: Avago Technologies General IP (Singapore) Pte. Ltd.
    Inventors: Jin Lu, Shaohua Yang, Weijun Tan
  • Patent number: 9222988
    Abstract: A magnetic sensor includes: a pulse generation circuit that generates a pulse having a pulse width shorter than the power-on time of an intermittent power supply signal from an external intermittent power supply; a magneto-electric conversion element; and a switch that controls, based on the pulse, a signal application time of the intermittent power supply signal to the magneto-electric conversion element within the power-on time. The magneto-electric conversion element is, for example, an MR element that outputs two detection signals, magnitude relation between signal levels of the two detection signals changing by field intensity of an external magnetic field. The magnetic sensor may further include an amplifier that amplifies the two detection signals and a comparator that compares the two amplified detection signals.
    Type: Grant
    Filed: January 23, 2012
    Date of Patent: December 29, 2015
    Assignee: MURATA MANUFACTURING CO., LTD.
    Inventor: Zhenhong Zhang
  • Patent number: 9171571
    Abstract: An embodiment of a read channel includes a filter, an interpolator, a recovery circuit, an error detector, a reverse interpolator, and a filter calibrator. The filter is operable to receive a raw sample of a signal and a coefficient-correction value, generate a filtered sample from the raw sample and a pre-established coefficient, and change the coefficient in response to the coefficient-correction value. The interpolator is operable to interpolate the filtered sample, and the recovery circuit is operable to generate a data symbol from the interpolated sample. The error detector is operable to generate an ideal sample from the data symbol and to generate a difference between the ideal sample and the interpolated sample, and the reverse interpolator is operable to reverse interpolate the difference. The filter calibrator is operable to receive the raw sample and to generate the coefficient-correction value from the raw sample and the reverse-interpolated difference.
    Type: Grant
    Filed: February 26, 2007
    Date of Patent: October 27, 2015
    Assignee: STMicrolectronics, Inc.
    Inventors: Hakan Ozdemir, Jonathan James Ashley
  • Patent number: 9164684
    Abstract: According to one embodiment, a magnetic disk drive includes a read/write channel configured to process a read/write signal with respect to a magnetic disk, a data refresh module configured to perform a rewrite for refreshing recorded data on the magnetic disk, a data capture module configured to capture read data in the read/write channel, a timing determination module configured to determine power shutdown timing during the rewriting from the read data, and a data recovery module configured to recover the read data by dividing the read data into two items based on the power shutdown timing, shifting timing of one item of the read data, and combining the shifted data with the other item of the read data.
    Type: Grant
    Filed: June 27, 2014
    Date of Patent: October 20, 2015
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Koji Ishii
  • Patent number: 9146683
    Abstract: A mapping table is modified to match one or more specified storage conditions of data stored in or expected to be stored in one or more logical block address ranges to physical addresses within a storage drive having performance characteristics that satisfy the specified storage conditions. For example, the performance characteristics may be a reliability of the physical location within the storage drive or a data throughput range of read/write operations. Existing data is moved and/or new data is written to physical addresses on the storage media possessing the performance characteristic(s), according to the mapping table. Further, a standard seeding or a seeding override for the re-mapped logical block addresses can prevent read operations from inadvertently reading incorrect physical addresses corresponding to the re-mapped logical block addresses.
    Type: Grant
    Filed: April 20, 2011
    Date of Patent: September 29, 2015
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Bo Wei, Steven TianChye Cheok, YongPeng Chng, CheeSeng Toh
  • Patent number: 9129647
    Abstract: A servo system includes an equalizer circuit operable to filter digital servo data samples according to filter tap coefficients to yield equalized data, a detector circuit operable to apply a data detection algorithm to the equalized data to yield hard decisions, a convolution circuit operable to yield ideal digital data based on the hard decisions and on target values, a subtraction circuit operable to subtract the ideal digital data from the equalized data to yield an adaptation error signal, an error gradient calculator operable calculate an error gradient signal based at least in part on the adaptation error signal, and a tap adaptation circuit operable to calculate values of the filter tap coefficients based on the error gradient signal.
    Type: Grant
    Filed: December 20, 2013
    Date of Patent: September 8, 2015
    Assignee: AVAGO TECHNOLOGIES GENERAL IP (SINGAPORE) PTE. LTD.
    Inventors: Yu Liao, Xun Zhang, Haitao Xia
  • Patent number: 9118511
    Abstract: A distributed Analog Finite Impulse Response (AFIR) filter circuit with n physical taps provides an output equivalent to an AFIR filter circuit with 2n?1 taps by emulating n?1 taps. An impedance mismatch, with respect to the characteristic impedance of the input and output transmission lines, is imposed at the input and output terminals to take advantage of the resulting reflective signal paths, which emulate the additional taps. This implementation results in space-savings and power-savings for on-chip implementations of the circuit. Implementations disclosed herein are advantageous in telecommunication applications that rely heavily on copper/FR4 backplanes in serial data links.
    Type: Grant
    Filed: October 9, 2013
    Date of Patent: August 25, 2015
    Assignee: PMC-Sierra US, Inc.
    Inventor: Johannes G. Ransijn
  • Patent number: 9071320
    Abstract: Apparatus and methods calibrate and control detector gain in a Mueller-Muller timing detector. A Mueller-Muller circuit obtains timing information for a received signal in which the receiving device samples the signal once per baud period.
    Type: Grant
    Filed: April 7, 2014
    Date of Patent: June 30, 2015
    Assignee: PMC-Sierra, Inc.
    Inventors: William D. Warner, Anthony Eugene Zortea
  • Patent number: 9065696
    Abstract: An equalizer that includes equalizer circuitry, a mean squared error (MSE) system, and adaptive control logic includes features that inhibit undesirable convergence to local minima.
    Type: Grant
    Filed: August 17, 2013
    Date of Patent: June 23, 2015
    Assignee: Avago Technologies General IP (Singapore) Pte. Ltd.
    Inventors: Georgios Asmanis, Faouzi Chaahoub, Samir Aboulhouda, Sriramkumar Sundararaman, Ajay Kumar Yadav
  • Patent number: 9042049
    Abstract: In accordance with one embodiment, a computer program product includes a computer readable storage medium having computer readable program code that is readable and/or executable by a processor to: receive a signal including precoded data read from a magnetic tape medium and pass the signal through a soft detector to calculator first soft information about each bit of the signal and to provide adaptive compensation for the precoded data, send the first soft information to a soft decoder, pass the signal through the soft decoder to calculate second soft information about each bit the signal, and send the second soft information to the soft detector, wherein the precoded data is passed through at least one precoder prior to being written to the magnetic tape medium via a precoder that applies 1/(1?D2) to bits of data, where D is delay corresponding to bit duration
    Type: Grant
    Filed: April 15, 2014
    Date of Patent: May 26, 2015
    Assignee: International Business Machines Corporation
    Inventors: Katherine T. Blinick, Robert A. Hutchins, Thomas Mittelholzer, Sedat Oelcer
  • Patent number: 9036288
    Abstract: A method for reading a track of data may include positioning a read head at an initial position relative to the track of data and obtaining initial track signals, filtering the initial track signals, positioning the read head at an initial subsequent position relative to the track of data and obtaining initial subsequent track signals, and filtering the initial subsequent track signals. In an initial equalization, the filtered initial track signals and the filtered initial subsequent track signals are equalized to obtain equalized track signals. The read head is positioned at a further subsequent position relative to the track of data and further subsequent track signals are obtained The further subsequent track signals are filtered. In a subsequent equalization, previously obtained equalized track signals and the filtered further subsequent track signals are equalized. A storage device operating according to the method may have an equalizer in hardware or firmware.
    Type: Grant
    Filed: November 12, 2014
    Date of Patent: May 19, 2015
    Assignee: Marvell International Ltd.
    Inventors: Nitin Nangare, Gregory Burd
  • Patent number: 9036287
    Abstract: In one embodiment, a method includes passing a signal through a noise whitening filter, passing the signal through a soft detector to calculate first soft information, passing the signal through the soft decoder to calculate second soft information based on the first soft information, and sending the second soft information to the soft detector, wherein the noise whitening filter is configured to process the signal according to the following transfer polynomial: W(D)=1?(p1D+ . . . p1D?), where p1 . . . p? are noise whitening coefficients, D is delay corresponding to bit duration, and a transfer polynomial of the tape channel is F(D)=1+f1D+ . . . +fLDL, wherein L represents a memory length of the tape channel, and wherein ? represents a memory length of the noise whitening filter. Other methods, systems, and computer program products are described in more embodiments.
    Type: Grant
    Filed: April 15, 2014
    Date of Patent: May 19, 2015
    Assignee: International Business Machines Corporation
    Inventors: Katherine T. Blinick, Robert A. Hutchins, Thomas Mittelholzer, Sedat Oelcer
  • Publication number: 20150116860
    Abstract: Techniques for processing signals read-back from a disk of a hard disk drive are described. In one example, a hard disk drive device generates a signal associated with a first position within a width of the data track. The first position may correspond to the center of a data track. The hard disk drive device generates a signal associated with a second position within a width of the data track. The second position may be located at a distance of approximately 10% of the track width from the track center. The hard disk drive device combines the signals and applies as signal conditioning technique to the combined signal.
    Type: Application
    Filed: October 28, 2013
    Publication date: April 30, 2015
    Applicant: HGST Netherlands B.V.
    Inventors: Jonathan Darrel COKER, Richard Leo GALBRAITH, Travis Roger OENNING, Roger William WOOD
  • Patent number: 9019647
    Abstract: The present inventions are related to systems and methods for information data processing included selective decoder message determination. In one example, a data processing system is disclosed that includes a data decoder circuit operable to apply a conditional data decoding algorithm to a data set to yield a decoded output. The conditional decoding algorithm is operable to calculate node messages using an approach selected from a group consisting of: a first message determination mechanism, and a second message determination mechanism; where one of the first message determination mechanism and the second message determination mechanism is selected based upon a condition that includes a global iteration count applied to the data set.
    Type: Grant
    Filed: August 28, 2012
    Date of Patent: April 28, 2015
    Assignee: LSI Corporation
    Inventors: Fan Zhang, Shaohua Yang
  • Patent number: 9013820
    Abstract: Devices and methods for reducing thermal stress within a head of a storage device are disclosed. In one or more embodiments, a method includes writing a selected pattern to a storage medium of a storage device using a head of the storage device; reading the selected pattern from the storage medium using the head to provide a data signal; and calculating an instability value of the head based on the data signal. The method can further include reconfiguring the storage device if the instability value is greater than an instability threshold by performing at least one of: deactivating a heater if the head includes two or more heaters; and increasing a fly height between the head and the storage medium.
    Type: Grant
    Filed: April 23, 2014
    Date of Patent: April 21, 2015
    Assignee: Seagate Technology LLC
    Inventors: Clifford Jayson Bringas Camalig, Gan Swee Chuan, Kai K. Yang, Mui Chong Chai
  • Patent number: 9013821
    Abstract: A data storage device is disclosed comprising a disk comprising a plurality of data tracks. A first data track is read to generate a first read signal that is sampled to generate first signal samples. A second data track adjacent the first data track is read to generate a second read signal that is sampled to generate second signal samples. The first signal samples and the second signal samples are processed by a first two-dimensional (2D) to one-dimensional (1D) equalizer to generate a first 1D sequence of equalized samples, and by a 2D-to-2D equalizer to generate a 2D sequence of equalized samples. The first 1D sequence of equalized samples are processed using a first 1D detector to detect a first estimated data sequence, and the 2D sequence of equalized samples are processed using a 2D detector to detect a second estimated data sequence.
    Type: Grant
    Filed: June 10, 2014
    Date of Patent: April 21, 2015
    Assignee: Western Digital Technologies, Inc.
    Inventor: Yiming Chen