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公开(公告)号：US11880225B2
公开(公告)日：2024-01-23
申请号：US17841054
申请日：2022-06-15
Inventor： Tadashi Ono , Isao Kato , Takuji Maeda
IPC: G06F1/06 , G06F9/4401 , G06F1/3215
CPC classification number: G06F9/4403 , G06F1/06 , G06F1/3215
Abstract: A slave device continuously transmits a plurality of tuning blocks to a host device at intervals defined by a clock period between a plurality of data blocks at the time of transmitting the plurality of data blocks and by a clock period defined by a data structure of the plurality of tuning blocks.
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公开(公告)号：US09921975B2
公开(公告)日：2018-03-20
申请号：US14685038
申请日：2015-04-13
Inventor： Yoshikazu Katoh , Takuji Maeda , Shinji Inoue , Masato Suto
CPC classification number: G06F12/1408 , G06F21/31 , G06F21/73 , G06F21/79 , G06F2212/1052 , G06F2221/2107 , G09C1/00 , G11C7/1006 , G11C13/0007 , G11C13/0069 , G11C2013/0083 , H04L2209/12
Abstract: A cryptographic processing device comprises a cipher control circuit operative to execute at least one of encryption of plaintext data and decryption of ciphertext data on the basis of conversion parameter data; and a memory cell array that includes a plurality of memory cells, the plurality of memory cells including: a memory cell in a variable state, in which a resistance value reversibly changes between a plurality of changeable resistance value ranges in accordance with an electric signal applied thereto; and a memory cell in an initial state, which does not change to the variable state unless a forming stress for changing the memory cell in the initial state to the variable state is applied thereto, a resistance value of the memory cell in the initial state being within an initial resistance value range which does not overlap with the plurality of changeable resistance value ranges, wherein in the memory cell array, data including the conversion parameter data is stored on the basis of whether each of the plurality of memory cells is in the initial state or the variable state.
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公开(公告)号：US10967890B2
公开(公告)日：2021-04-06
申请号：US16139724
申请日：2018-09-24
Inventor： Nobuhiko Arashin , Takuji Maeda
IPC: B61L15/00 , H04W4/46 , H04W4/42 , B60L15/42 , H04W16/28 , H01Q1/32 , H01Q21/28 , H04B17/318 , B61L23/34 , H04B7/06
Abstract: A first antenna group includes one first antenna disposed at one end of a leading car, and another first antenna disposed at one end of a following car. A second antenna group includes one second antenna disposed at the one end of the leading car, the position where the one second antenna is disposed being different from the position where the one first antenna is disposed in a direction orthogonal to a travel direction of the leading car, and another second antenna disposed at the one end of the following car. A measurement unit measures radio wave strength between a pair of first antennas during communication via the first antenna group. A controller is enabled to make a switch from the first antenna group to the second antenna group when the radio wave strength is less than a predetermined value.
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公开(公告)号：US10162833B2
公开(公告)日：2018-12-25
申请号：US14739034
申请日：2015-06-15
Inventor： Masayuki Toyama , Takuji Maeda
Abstract: The present disclosure provides a method of copying files at a high speed when accesses to both of a local memory physically connected to an access device and a remote memory connected via a wireless network. A file copy controller in the access device generates a FS transfer list in which logical address positions of copy sources and logical address positions of copy destinations are stored, based on file system management information of the local memory and an access list, obtained from another access device, of the remote memory, and inputs the FS transfer list to a non-volatile memory controller connected to the local memory. The non-volatile memory controller copies data between the local memory and the remote memory based on the information stored in the FS transfer list without using a CPU in the access device or an internal bus connected to the CPU.
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Patent Agency Ranking
公开(公告)号：US11001281B2
公开(公告)日：2021-05-11
申请号：US16140814
申请日：2018-09-25
Inventor： Takuji Maeda , Nobuhiko Arashin
Abstract: A train communication system is configured to perform wireless communication between two cars coupled to each other by using low power radio. The train communication system includes: a first device disposed on one coupling surface of two coupling surfaces facing each other between two cars; a second device disposed on the one coupling surface; a third device disposed on another coupling surface of the two coupling surfaces; and a fourth device disposed on the other coupling surface. The first device and the third device are disposed to face each other. The second device and the fourth device are disposed to face each other. When no wireless connections are established among the first device, the second device, the third device, and the fourth device, the first to fourth devices each perform at least one of switching of communication channels used for wireless communication among the first to fourth devices and switching of a master device or a slave device.
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公开(公告)号：US10448262B2
公开(公告)日：2019-10-15
申请号：US15847257
申请日：2017-12-19
Inventor： Akira Yamasaki , Nobuhiko Arashin , Takuji Maeda
Abstract: A communication system includes a transmission terminal and a reception terminal, and the transmission terminal transmits data to the reception terminal. The transmission terminal includes a storage unit that stores data and management information of the data, and a first communication unit that performs communication using a first radio method having non-directivity and a second radio method having directivity. The reception terminal includes a second communication unit that performs communication using the first radio method having non-directivity and the second radio method having directivity, and a selector that selects the data based on the management information. The first communication unit and the second communication unit communicate with each other using the first radio method having non-directivity when selecting the data to be transmitted, and communicates with each other using the second radio method having directivity when transmitting the selected data.
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公开(公告)号：US09762671B2
公开(公告)日：2017-09-12
申请号：US14739029
申请日：2015-06-15
Inventor： Takuji Maeda , Masayuki Toyama
CPC classification number: H04L67/1097 , G06F17/30067 , H04B7/24 , H04L67/06 , H04L67/12
Abstract: A file copy controller in a wireless access device reads file system management information of both of a local memory and a remote memory, generates a FS transfer list in which logical address positions of copy sources and logical address positions of copy destinations are stored, and inputs the FS transfer list to a non-volatile memory controller connected to the local memory. The non-volatile memory controller performs copy operation between the local memory and the remote memory based on the information stored in the FS transfer list without using a CPU in an access device or an internal bus connected to the CPU.
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公开(公告)号：US09811476B2
公开(公告)日：2017-11-07
申请号：US14769615
申请日：2014-02-06
Inventor： Takuji Maeda , Shinji Inoue , Yoshikazu Katoh
CPC classification number: G06F12/1408 , G06F12/0238 , G06F21/62 , G06F2212/1052 , G06F2212/202 , H04L9/088 , H04L9/0897 , H04L9/14 , H04L2209/605
Abstract: An encryption and recording apparatus storing data, the apparatus including: a first nonvolatile memory; a second nonvolatile memory; and an encryption and decryption control unit, wherein the encryption and decryption control unit: manages an area included in the second nonvolatile memory on a per-block basis, and manages association between a block and a block-unique key using key management information stored in the first nonvolatile memory; receives the data and corresponding information associated with the data; encrypts the data, using one or more block-unique keys associated with one or more blocks included in the second nonvolatile memory and writes the data to the one or more blocks; and stores the corresponding information into the key management information, associating the corresponding information and the one or more block-unique keys.
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公开(公告)号：US09778857B2
公开(公告)日：2017-10-03
申请号：US14611784
申请日：2015-02-02
Inventor： Takuji Maeda , Masayuki Toyama , Hirokazu So
CPC classification number: G06F3/0613 , G06F3/064 , G06F3/0659 , G06F3/0679 , H04N5/907 , H04N5/91
Abstract: A recording device operates in accordance with an instruction from an access device. The recording device comprising a nonvolatile memory that stores data, a communication unit that receives an instruction issued by the access device, and a memory controller that controls the nonvolatile memory. When a recording instruction for recording data into the nonvolatile memory is received from the access device, the memory controller starts recording of data into the nonvolatile memory. When the memory controller receives from the access device a suspension instruction for suspending the recording of data, the memory controller stores suspension information into the nonvolatile memory, the suspension information indicating a suspended position as a position in a recording area of the nonvolatile memory at which the data is being recorded upon reception of the suspension instruction.
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