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公开(公告)号：US10277718B1
公开(公告)日：2019-04-30
申请号：US15359591
申请日：2016-11-22
Applicant: Seagate Technology LLC
Inventor： Jason Vincent Bellorado , Marcus Marrow
Abstract: Systems and methods are disclosed for detection and mitigation of defects within a preamble portion of a signal, such as a data sector preamble recorded to a data storage medium. In certain embodiments, an apparatus may comprise a circuit configured to synchronize a sampling phase for sampling a signal pattern. The circuit may sample a preamble field of the signal pattern to obtain sample values, split the sample values into a plurality of groups, determine defect groups having samples corresponding to defects in the preamble field, remove the defect groups from the plurality of groups, and synchronize the sampling phase based on the plurality of groups.
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公开(公告)号：US10243703B1
公开(公告)日：2019-03-26
申请号：US15810545
申请日：2017-11-13
Applicant: Seagate Technology LLC
Inventor： Jason Vincent Bellorado , Marcus Marrow
IPC: H04L1/20 , H04L12/801 , H04W84/12
Abstract: Systems and methods are disclosed for detection of a selected signal pattern, such as a servo sector preamble, and for frequency offset determination. A circuit may be configured to divide a signal into detection windows of a selected size, and sample the signal a selected number of times within each detection window. The circuit may then determine an error value for each detection window based on values of the samples for each detection window, and determine the preamble is detected when a threshold number of most-recently sampled detection windows have error values below a threshold value. The circuit may then organize the sample values corresponding to the preamble into groups, and calculate phase estimates representing a phase at which the groups were sampled. The circuit may determine a frequency offset based on the phase estimates, and modulate the sampling frequency according to the frequency offset.
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公开(公告)号：US09979573B1
公开(公告)日：2018-05-22
申请号：US15390447
申请日：2016-12-23
Applicant: Seagate Technology LLC
Inventor： Marcus Marrow , Jason Vincent Bellorado , Trung Thuc Nguyen
Abstract: A method may generate a demodulated sine component for a sequence of samples of a servo burst window of a position error signal using a sine weight look up table and generate a demodulated cosine component for the sequence of samples of the servo burst window of the position error signal using a cosine weight look up table. The sine weight and the cosine weight look up tables may have indexes representing a phase range. The method may generate a demodulated phase component signal and a demodulated amplitude component signal for the sequence of samples of the servo burst window of the position error signal based on the demodulated sine component and the demodulated cosine component using a Coordinate Rotation Digital Computer at least in part by iteratively rotating a vector based on the demodulated sine component and the demodulated cosine component and summing angular changes in the vector.
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公开(公告)号：US10298240B1
公开(公告)日：2019-05-21
申请号：US15950766
申请日：2018-04-11
Applicant: Seagate Technology LLC
Inventor： Marcus Marrow , Kenneth John Evans , Jason Vincent Bellorado
Abstract: In certain embodiments, an apparatus may comprise a circuit configured to scale a phase control value from an external phase control resolution of an external clock frequency to an internal phase control resolution of an internal clock frequency to generate a target phase control value. The circuit may also determine a difference between a current phase control value and the target phase control value and determine a phase step value based on the difference. Further, the circuit may modify a current phase control value based on the phase step value and generate a phase controlled clock signal at the internal clock frequency using the modified phase control value. Additionally, the circuit may divide the phase controlled clock signal at the internal clock frequency to generate a phase controlled clock signal at the external clock frequency.
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公开(公告)号：US10084553B1
公开(公告)日：2018-09-25
申请号：US15389385
申请日：2016-12-22
Applicant: Seagate Technology LLC
Inventor： Jason Vincent Bellorado , Marcus Marrow , Zheng Wu
CPC classification number: H04L7/0332 , H04L1/00 , H04L7/0029 , H04L25/03057 , H04L25/03286 , H04L25/03318
Abstract: In certain embodiments, a method may include receiving one or more equalized samples of an input signal. The method may further include mitigating one or more excursions in the one or more equalized samples based on one or more current decisions of an iterative decoding process to generate compensated equalized samples. In addition, the method may include performing iterative decoding operations based on the compensated equalized samples, updating the current decisions of the iterative decoding process and outputting the current decisions as a converged result when the iterative decoding operations have converged for the compensated equalized samples.
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Patent Agency Ranking
公开(公告)号：US09819456B1
公开(公告)日：2017-11-14
申请号：US15295958
申请日：2016-10-17
Applicant: Seagate Technology LLC
Inventor： Jason Vincent Bellorado , Marcus Marrow
IPC: H04L1/20 , H04L12/801
CPC classification number: G11B20/10009 , H04L7/042 , H04L2007/047
Abstract: Systems and methods are disclosed for detection of a selected signal pattern, such as a servo sector preamble, and for frequency offset determination. A circuit may be configured to divide a signal into detection windows of a selected size, and sample the signal a selected number of times within each detection window. The circuit may then determine an error value for each detection window based on values of the samples for each detection window, and determine the preamble is detected when a threshold number of most-recently sampled detection windows have error values below a threshold value. The circuit may then organize the sample values corresponding to the preamble into groups, and calculate phase estimates representing a phase at which the groups were sampled. The circuit may determine a frequency offset based on the phase estimates, and modulate the sampling frequency according to the frequency offset.
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公开(公告)号：US10790933B1
公开(公告)日：2020-09-29
申请号：US16454395
申请日：2019-06-27
Applicant: Seagate Technology LLC
Inventor： Vincent Brendan Ashe , Jason Vincent Bellorado , Marcus Marrow
Abstract: Systems and methods are disclosed for constrained receiver parameter optimization. Two parameter optimization functions may be applied, with one function providing constraints on the results of the second function in order to determine a parameter set to apply in the receiver. A method may comprise determining a first parameter set based on a first function, determining a second parameter set based on a second function different from the first function, and determining a third parameter set by using the first parameter set to define a subset of a parameter space to which to limit values from the second parameter set. In certain embodiments, a least squares function may be used to constrain the results of a general cost function.
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公开(公告)号：US10692527B1
公开(公告)日：2020-06-23
申请号：US16211186
申请日：2018-12-05
Applicant: Seagate Technology LLC
Inventor： Jason Vincent Bellorado , Marcus Marrow , Zheng Wu
Abstract: An apparatus may include a circuit including a filter configured to update one or more adaptive coefficients of the filter based on an error signal. Further, the circuit may update a constrained coefficient of the filter based on the one or more adaptive coefficients, the constrained coefficient and a desired value. Moreover, the circuit may generate a sample of a sample sequence based on the one or more adaptive coefficients and the updated constrained coefficient, the error signal being based on the sample sequence.
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公开(公告)号：US10601617B1
公开(公告)日：2020-03-24
申请号：US15973944
申请日：2018-05-08
Applicant: Seagate Technology LLC
Inventor： Marcus Marrow , Jason Vincent Bellorado , Trung Thuc Nguyen
Abstract: A method may generate a demodulated sine component for a sequence of samples of a servo burst window of a position error signal using a sine weight look up table and generate a demodulated cosine component for the sequence of samples of the servo burst window of the position error signal using a cosine weight look up table. The sine weight and the cosine weight look up tables may have indexes representing a phase range. The method may generate a demodulated phase component signal and a demodulated amplitude component signal for the sequence of samples of the servo burst window of the position error signal based on the demodulated sine component and the demodulated cosine component using a Coordinate Rotation Digital Computer at least in part by iteratively rotating a vector based on the demodulated sine component and the demodulated cosine component and summing angular changes in the vector.
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公开(公告)号：US10164760B1
公开(公告)日：2018-12-25
申请号：US15297089
申请日：2016-10-18
Applicant: Seagate Technology LLC
Inventor： Jason Vincent Bellorado , Marcus Marrow , Zheng Wu
IPC: H04L7/00
Abstract: Systems and methods are disclosed for detecting and compensating for timing excursions in a data channel. If a signal contains discontinuities in phase, a detector of the channel may lose lock on the signal, resulting in the channel incorrectly adjusting a sampling phase toward a following symbol or previous symbol. This is referred to as a cycle slip, where the integer alignment of the sampling of a signal contains a discontinuity over the duration of a sector, preventing decoding of the signal. A circuit may be configured to detect a cycle slip during processing of a signal at a data channel based on timing error values, and when the signal fails to decode, shift an expected sampling phase of a detector for a subsequent signal processing attempt. Shifting the expected sampling phase can cause the channel to adjust the sampling phase in the correct direction, thereby preventing a cycle slip.
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