公开(公告)号：US20230008751A1

公开(公告)日：2023-01-12

申请号：US17862024

申请日：2022-07-11

Applicant: Seagate Technology LLC

Inventor： Walter R. Eppler ,  Adam Robert Bush

IPC: G01S17/931 ,  G01S17/10 ,  G01S7/4861 ,  G01S7/497 ,  G01S17/42 ,  G01S7/4865 ,  G01S7/486

Abstract: Apparatus and method for adaptively adjusting amplifier gain based on detected distance to a target in a light detection and ranging (LiDAR) system. In some embodiments, the amplifier amplifies detected pulses obtained from a photodetector, and the gain is adjusted from among at least two selectable gain modes responsive to a measured time of flight (ToF) for the pulses. A first range of gain levels can be used for targets that are within a first maximum distance range, and a second range of gain levels can be used for targets that are beyond the first maximum distance range. Each mode can extend from a minimum to a maximum value along a selected linear slope. A gain adjustment circuit can use a Gilbert Cell or a multiplier and fully differential amplifier arrangement.

公开(公告)号：US20200153800A1

公开(公告)日：2020-05-14

申请号：US16189032

申请日：2018-11-13

Applicant: Seagate Technology LLC

Inventor： Mehmet Fatih Erden ,  Walter R. Eppler ,  Robert D. Murphy ,  Greg D. Larrew

IPC: H04L29/06 ,  G06F11/10 ,  H04L9/08 ,  G06N20/20

Abstract: One or more networks each include a plurality of sensor nodes operable to communicate public data with each other. Each of the plurality of sensor nodes is operable to gather sensor node data and store the sensor node data locally on the sensor node. Duplicate portions of the sensor node data are distributed to the public data of others of the plurality of sensor nodes via the public data paths for backup storage. The system includes a host that is coupled to individually communicate private data with each of the plurality of sensor nodes. Each of the sensor nodes protects the private data from others of the sensor nodes using distributed key management to ensure distributed encryption.

公开(公告)号：US10311897B1

公开(公告)日：2019-06-04

申请号：US16048768

申请日：2018-07-30

Applicant: Seagate Technology LLC

Inventor： Walter R. Eppler ,  Mehmet Fatih Erden ,  Stephanie Hernandez

IPC: G11B5/00 ,  G11B5/09 ,  G11B20/18 ,  G11B5/48

Abstract: First and second tracks of a magnetic recording medium are read simultaneously via a first reader that provides a first signal based on detecting a total perpendicular field of the first and second tracks. The first and second tracks are read simultaneously via a second reader that provides a second signal based on detecting a total longitudinal field of the first and second tracks. Data is detected from the first and second signals.

公开(公告)号：US09818447B1

公开(公告)日：2017-11-14

申请号：US15464672

申请日：2017-03-21

Applicant: Seagate Technology LLC

Inventor： Xuan Zheng ,  Walter R. Eppler ,  Julius K. Hohlfeld ,  Heidi M. Olson

IPC: G11B5/02 ,  G11B27/36 ,  G11B20/18 ,  G11B5/012 ,  G11B7/126 ,  G11B5/00

CPC classification number: G11B20/1816 ,  G11B5/012 ,  G11B7/126 ,  G11B2005/0021

Abstract: A method comprises writing a waveform on a magnetic recording medium using a heat-assisted magnetic recording apparatus which includes a laser. The method also comprises reading back the waveform from the medium, and detecting one or more transition shifts in the readback waveform indicative of a mode hop of the laser. The method further comprises measuring a metric of the one or more transition shifts.

公开(公告)号：US11924173B2

公开(公告)日：2024-03-05

申请号：US17229038

申请日：2021-04-13

Applicant: Seagate Technology LLC

Inventor： Mehmet Fatih Erden ,  Walter R. Eppler ,  Robert D. Murphy ,  Greg D. Larrew

IPC: H04L9/40 ,  G06F11/10 ,  G06N20/20 ,  H04L9/08 ,  H04W12/03

CPC classification number: H04L63/0428 ,  G06F11/1076 ,  G06N20/20 ,  H04L9/0827 ,  H04L63/18 ,  H04L63/0442 ,  H04W12/03

Abstract: An edge node has a central processing operable to gather sensor node data via a sensor and store at least part of the sensor node data locally in a public region of a persistent storage. The edge node backs up duplicate portions of the sensor node data to public storage regions of peer-edge nodes. The edge node receives private data from a host that is coupled to the edge computing node and the peer edge nodes, and stores the private data in a private region of the persistent storage. The private region is protected from the peer edge nodes using distributed key management.

公开(公告)号：US11881239B1

公开(公告)日：2024-01-23

申请号：US17733521

申请日：2022-04-29

Applicant: Seagate Technology LLC

Inventor： Walter R. Eppler ,  Drew M. Mader

IPC: G11B21/02 ,  G11B5/60

CPC classification number: G11B5/6029

Abstract: A controller extracts a distortion component of a readback signal from a magnetic read head. The distortion component may be found using a finite length Volterra series, for example. The controller estimates a clearance between the read head and a recording medium based on the distortion component. This clearance measurement can be used for closed loop fly-height control of the read head.

公开(公告)号：US11223447B1

公开(公告)日：2022-01-11

申请号：US17219444

申请日：2021-03-31

Applicant: Seagate Technology LLC

Inventor： Mehmet Fatih Erden ,  Walter R. Eppler

IPC: H04L1/00 ,  H04L25/03

Abstract: Systems and methods are disclosed for a multiple detector data channel and data detection utilizing different cost functions. For example, a digital data channel system can have multiple data detectors where each data detector implements a distinct cost function for detecting data. A cost function analyzer can then selectively choose decisions from the multiple data detectors to generate a data sequence. In some examples, a dual detector system may have one detector implement a Soft-Output Viterbi Algorithm (SOVA) cost function and another detector implement a peak detection algorithm. Further, in some embodiments, the cost function analyzer can implement multiple selection criteria to determine which decisions to include in a data sequence from the multiple data detectors.

公开(公告)号：US20210234844A1

公开(公告)日：2021-07-29

申请号：US17229038

申请日：2021-04-13

Applicant: Seagate Technology LLC

Inventor： Mehmet Fatih Erden ,  Walter R. Eppler ,  Robert D. Murphy ,  Greg D. Larrew

IPC: H04L29/06 ,  G06F11/10 ,  H04L9/08 ,  G06N20/20

Abstract: An edge node has a central processing operable to gather sensor node data via a sensor and store at least part of the sensor node data locally in a public region of a persistent storage. The edge node backs up duplicate portions of the sensor node data to public storage regions of peer-edge nodes. The edge node receives private data from a host that is coupled to the edge computing node and the peer edge nodes, and stores the private data in a private region of the persistent storage. The private region is protected from the peer edge nodes using distributed key management.

公开(公告)号：US10339963B1

公开(公告)日：2019-07-02

申请号：US16025424

申请日：2018-07-02

Applicant: Seagate Technology LLC

Inventor： Drew Michael Mader ,  Ian James Gilbert ,  Walter R. Eppler ,  Tim Rausch

IPC: G11B11/00 ,  G11B5/09 ,  G11B5/00 ,  G11B5/60 ,  G11B7/1263 ,  G11B7/1267 ,  G11B7/126

Abstract: Pseudorandom bit sequences are recorded to a heat-assisted recording medium at a laser power that is stepped while recording the pseudorandom bit sequences. The pseudorandom bit sequences are read from the heat-assisted recording medium to determine timing differences between bits written before and after the laser power is stepped. A thermal gradient of bits written to the heat-assisted recording medium is determined based on the timing differences.