公开(公告)号：US20240275512A1

公开(公告)日：2024-08-15

申请号：US18565284

申请日：2021-06-07

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Kenichi Matsunaga ,  Kento Watanabe

IPC: H04J3/06 ,  H04W4/38 ,  H04W56/00

CPC classification number: H04J3/0661 ,  H04W4/38 ,  H04W56/001

Abstract: An embodiment communication connection determination method is a communication connection determination method between a sensor terminal and a sensor accommodating terminal, the method including a step of receiving first data and storing a first time stamp, a step of determining the reception number of pieces of the first data, a step of calculating a mean deviation reference value using a first time stamp interval obtained from the first time stamp, a step of receiving second data and storing a second time stamp, a step of determining the reception number of pieces of the second data, a step of calculating a mean deviation evaluation value using a second time stamp interval obtained from the second time stamp, and a step of testing whether there is a significant difference between the mean deviation reference value and the mean deviation evaluation value.

公开(公告)号：US11955985B2

公开(公告)日：2024-04-09

申请号：US17782766

申请日：2019-12-10

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Tadashi Minotani ,  Kenichi Matsunaga

IPC: H03M1/00 ,  H03M1/34

CPC classification number: H03M1/34

Abstract: An AD converter includes: an integration unit that uses an input voltage as an initial value and repeats an operation of integrating one or both of two types of unit voltages with the input voltage, thereby generating an integrated voltage; a switching threshold voltage unit that includes two types of threshold voltages causing the operation of integrating to be terminated; a comparator that compares the integrated voltage with the threshold voltages; an integration determination unit that, before the operation of integrating is started, causes the comparator to compare the input voltage with a rough adjustment threshold voltage corresponding to a larger one of the unit voltages; a unit voltage switching control unit that, when the rough adjustment threshold voltage is larger than the input voltage, controls the integration unit to generate the integrated voltage by using the two types of unit voltages; and a single unit voltage control unit that, when the rough adjustment threshold voltage is smaller than the input voltage, controls the integration unit to generate the integrated voltage by using only a smaller one of the unit voltages.

公开(公告)号：US11770127B2

公开(公告)日：2023-09-26

申请号：US17608106

申请日：2019-05-21

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Tadashi Minotani ,  Kenichi Matsunaga

IPC: H03M1/10 ,  H03M1/56

CPC classification number: H03M1/1023 ,  H03M1/10 ,  H03M1/56

Abstract: A self-calibration-function-equipped AD converter that does not require a measurement device for calibration includes: a control unit including a calibration control unit configured to control an operation of calibrating the self-calibration-function-equipped AD converter, and a conversion control unit configured to control an operation of converting an input voltage to be subjected to conversion into a digital signal; a reference voltage unit configured to output a reference voltage; and an integration/conversion unit including an integrating unit configured to generate an integration voltage obtained by integrating two or more types of unit voltages, a comparator that has two inputs and is configured to compare the integration voltage and the input voltage or the reference voltage, and a crossbar switch configured to switch a connection depending on whether the integration voltage is to be input to one input of the comparator and the input voltage or the reference voltage is to be input to another input, or the input voltage or the reference voltage is to be input to the one input of the comparator and the integration voltage is to be input to the other input.

公开(公告)号：US20220361815A1

公开(公告)日：2022-11-17

申请号：US17773913

申请日：2019-11-06

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Kei Kuwabara ,  Akio Tokura ,  Hiroto Matsuoka ,  Takako Ishihara ,  Takayuki Ogasawara ,  Yuki Hashimoto ,  Kenichi Matsunaga ,  Toshiki Wada ,  Hiroyoshi Togo

IPC: A61B5/00 ,  A61B5/25 ,  A61B5/11

Abstract: A wearable sensor device includes a temperature and humidity sensor that measures ambient environmental information around a living body, a snap button connected to a bioelectrode, a biological information measurement unit that measures biological information, an inertial sensor that measures inertial information, a calculation unit that calculates a biological feature amount based on the biological information and calculates an inertial feature amount based on the inertial information, and a wireless communication unit that transmits the biological information, the inertial information, the biological feature amount, the inertial feature amount, and the environmental information to the outside.

公开(公告)号：US20220272505A1

公开(公告)日：2022-08-25

申请号：US17625166

申请日：2019-07-08

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Kenichi Matsunaga ,  Takayuki Ogasawara ,  Hiroyoshi Togo

IPC: H04W4/38 ,  H04W4/80 ,  H04W40/12

Abstract: Relay terminals each transmit to a control device a packet received from a wireless sensor and a reception strength for short range wireless communication detected when receiving the packet, and return a response to the packet to a transmission source wireless sensor from which the packet is transmitted only when a response instruction is issued from the control device, and the control device compares reception strengths for a same packet that is transmitted from a same wireless sensor and received by each of the plurality of relay terminals among the reception strengths received from the relay terminals, transmits the response instruction only to one target relay terminal with the highest reception strength, and performs relay transfer of sensor data stored in a packet received by the target relay terminal to a host apparatus.

公开(公告)号：US11368162B2

公开(公告)日：2022-06-21

申请号：US17292685

申请日：2019-10-29

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Tadashi Minotani ,  Kenichi Matsunaga

IPC: H03M1/10

Abstract: An AD converter is provided with a control unit including a calibration control unit that controls an operation for calibrating the control unit and a conversion control unit that controls an operation for converting a target input voltage into a digital signal; a reference voltage unit that outputs a reference voltage; and an integrating converter unit including an integrating unit that generates an integrated voltage by integrating a predetermined unit voltage, a comparator that has two inputs and compares the integrated voltage and an input voltage or a reference voltage Vref, and a crossbar switch that switches connections between the case where the integrated voltage is inputted to one of the inputs of the comparator and the input voltage or the reference voltage Vref is inputted to the other input and the case where the input voltage or the reference voltage Vref is inputted to one of the inputs of the comparator and the integrated voltage is inputted to the other input.

公开(公告)号：US11284229B2

公开(公告)日：2022-03-22

申请号：US16486103

申请日：2018-02-15

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Kenichi Matsunaga ,  Shoichi Oshima ,  Ahmed Musa

IPC: H04W4/38 ,  H04L7/00 ,  H04L67/12

Abstract: A sensor control circuit periodically transmits packets in synchronism with a one-by-one monotonous change in count values from a real-time clock circuit. The count values repeat the change within a predetermined numerical value range. The sensor control circuit transmits the count values by adding them to the packets. A collection control circuit acquires values of a reference clock synchronized with a reference time of an upper network from a reference clock generation circuit in accordance with reception of the packets, stores the values in a storage circuit as time stamps representing arrival times of the packets, performs statistical processing of the time stamps and the count values concerning the packets received, and corrects the time stamps based on an packet transmission interval and a reference arrival time representing the arrival time of a head packet, which are obtained from the statistical processing.

公开(公告)号：US10916122B2

公开(公告)日：2021-02-09

申请号：US16302053

申请日：2017-05-10

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Shoichi Oshima ,  Kenichi Matsunaga ,  Toshihiko Kondo ,  Hiroki Morimura

IPC: G08C15/06 ,  H04L12/28 ,  H04Q9/00 ,  G08C15/00 ,  H04B7/155 ,  H04W88/04

Abstract: In a sensor relay apparatus (10), a communication control unit (13) receives sensor data from a sensor terminal (ST) via a terminal module (11) when a transmission data amount related to the sensor data to be transmitted from the sensor terminal (ST) is equal to or greater than a determination threshold. This can reduce the overhead time taken at the time of the transmission of the sensor data.

公开(公告)号：US20240275396A1

公开(公告)日：2024-08-15

申请号：US18563115

申请日：2021-06-16

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Tadashi Minotani ,  Kenichi Matsunaga

IPC: H03M1/10

CPC classification number: H03M1/1014

Abstract: An A/D converter includes: a first reference voltage unit that generates a temperature-compensated reference voltage; a second reference voltage unit that generates a second reference voltage calibrated with the reference voltage; an integration unit that generates an integrated voltage obtained by integrating unit voltages using any one of the reference voltage, the second reference voltage, and a ground voltage as an initial value during calibration; a comparator that compares the integrated voltage with a threshold voltage and outputs a determination signal; a calibration control unit that measures an integration time until the integrated voltage exceeds the threshold voltage from the initial value during calibration and calibrates the unit voltages and an offset voltage of the comparator; and a conversion control unit that converts an input voltage into a digital value using a conversion integration time which is the integration time when the input voltage is an initial value and the second reference voltage during conversion.

公开(公告)号：US20230336947A1

公开(公告)日：2023-10-19

申请号：US18041921

申请日：2020-09-30

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Rieko Sato ,  Takayuki Ogasawara ,  Kenichi Matsunaga

IPC: H04W4/029

CPC classification number: H04W4/029

Abstract: A data analysis system includes: a data acquisition unit that acquires sensor data including user identification information; a data collection processing unit that collects the sensor data from a predetermined region as a target; a data analysis unit that calculates the number of users who are staying in the predetermined region based on the user identification information; an estimation unit that estimates density of the users based on the number of the users; and an alert display unit that displays the density.