Patents by Inventor Masaki Nishikawa

Masaki Nishikawa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20220311398
    Abstract: An isolation amplifier of an embodiment includes: a primary circuit including an encoder configured to encode an input signal and output the encoded input signal and an anomaly detection circuit configured to detect anomaly having occurred to the input signal and generate a detection signal; an isolation unit configured to insulate the primary circuit from a secondary circuit; an output circuit configured to generate an output signal corresponding to the input signal; and an anomaly-input sensing-output circuit configured to generate an output signal from the secondary circuit by changing the output signal from the output circuit based on the detection signal.
    Type: Application
    Filed: September 7, 2021
    Publication date: September 29, 2022
    Inventors: Makoto ARAI, Masaki NISHIKAWA, Shoji OOTAKA, Tadashi ARAI, Manabu YAMADA, Shigeyasu IWATA, Takeshi MURASAKI
  • Publication number: 20220311451
    Abstract: An isolator of embodiments includes a ?? analog-digital converter configured to convert an analog signal into a digital signal of one bit and transmit the digital signal of one bit as normal data, a time direction multiplexing circuit configured to perform time direction multiplexing of alternately performing conversion of the normal data into a digital differential signal and transmission of the digital differential signal, and transmission of a special signal different from the normal data, and an insulated transmission circuit configured to transmit the digital differential signal and the special signal transmitted from the time direction multiplexing circuit via an insulating layer.
    Type: Application
    Filed: August 31, 2021
    Publication date: September 29, 2022
    Inventors: Masaki Nishikawa, Shoji Ootaka
  • Publication number: 20220263513
    Abstract: A phase correcting device includes a local oscillator configured to give a local oscillation signal to a device configured to detect a phase of an inputted signal, a first phase detector configured to detect a phase of the local oscillation signal to output the phase of the local oscillation signal, a reference phase device configured to generate a quasi-reference phase corresponding to a reference phase of the local oscillation signal at a time of an initial setting of the local oscillator to output the quasi-reference phase, based on a reference clock, a second phase detector configured to detect, a fluctuation amount of a phase of the local oscillator, based on the phase detected by the first phase detector and the quasi-reference phase, and a correction circuit configured to correct the phase of the inputted signal by using a detection result of the second phase detector.
    Type: Application
    Filed: February 8, 2022
    Publication date: August 18, 2022
    Inventors: Masaki NISHIKAWA, Shoji Ootaka
  • Publication number: 20220166437
    Abstract: A phase correcting device includes a local oscillator that includes an all digital phase-locked loop configured to output a local oscillation signal, a first phase detector configured to detect a phase of the local oscillation signal to output the phase of the local oscillation signal, a reference phase device configured to generate a quasi-reference phase corresponding to a reference phase of the local oscillation signal to output the quasi-reference phase, based on a reference clock, a second phase detector configured to detect a fluctuation amount of a phase of the local oscillator, based on the phase detected by the first phase detector and the quasi-reference phase, and a correction circuit configured to correct the phase of the inputted signal by using a detection result of the second phase detector.
    Type: Application
    Filed: February 11, 2022
    Publication date: May 26, 2022
    Inventor: Masaki Nishikawa
  • Patent number: 11287519
    Abstract: A distance measurement system for transmitting and receiving a distance measurement signal including a phase detection signal between first and second devices and calculating a distance between the devices based on a phase detection result of the received phase detection signal includes a modulation circuit configured to generate the distance measurement signal including a modulated signal obtained by modulating an identification signal, a transmission circuit configured to transmit the distance measurement signal, a reception circuit configured to receive the distance measurement signal, a demodulation circuit configured to demodulate the modulated signal in the received distance measurement signal, and a control circuit configured to judge a restored state of the identification signal obtained from a demodulation result of the demodulation circuit.
    Type: Grant
    Filed: September 17, 2019
    Date of Patent: March 29, 2022
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventors: Shoji Ootaka, Masaki Nishikawa, Takayuki Kato, Katsuya Nonin, Yoshiharu Nito
  • Publication number: 20220091263
    Abstract: A phase correcting device of an embodiment includes a local oscillator that includes an all digital phase-locked loop configured to generate a plurality of kinds of local oscillation signals based on a reference clock, and is configured to give one of the local oscillation signals to a device configured to detect a phase of an inputted signal, a phase detector configured to acquire and output, at a predetermined timing, an output of a phase integrator included in the all digital phase-locked loop, and a phase calculator configured to acquire, a plurality of times at predetermined timings, values outputted from the phase detector and correct the phase of the inputted signal by using a difference between the values.
    Type: Application
    Filed: March 11, 2021
    Publication date: March 24, 2022
    Inventor: Masaki Nishikawa
  • Publication number: 20220091253
    Abstract: A distance measurement device of an embodiment includes a first device including a first reference signal source and a first transmitter-receiver, a second device including a second reference signal source and a second transmitter-receiver, and a calculation unit configured to calculate a distance between the first device and the second device. One of a first distance measurement signal and a second distance measurement signal is transmitted once or more, and another is transmitted twice or more. The calculation unit calculates the distance based on a total of three or more pieces of first phase information and second phase information acquired through transmission of the distance measurement signals three times or more in total, a first sampling period based on a first reference signal, and a second sampling period based on a second reference signal.
    Type: Application
    Filed: March 12, 2021
    Publication date: March 24, 2022
    Inventors: Shoji Ootaka, Masaki Nishikawa, Katsuya Nonin, Hiroshi Yoshida, Masayoshi Oshiro
  • Patent number: 11277142
    Abstract: A phase correcting device includes a local oscillator configured to give a local oscillation signal to a device configured to detect a phase of an inputted signal, a first phase detector configured to detect a phase of the local oscillation signal to output the phase of the local oscillation signal, a reference phase device configured to generate a quasi-reference phase corresponding to a reference phase of the local oscillation signal at a time of an initial setting of the local oscillator to output the quasi-reference phase, based on a reference clock, a second phase detector configured to detect a fluctuation amount of a phase of the local oscillator, based on the phase detected by the first phase detector and the quasi-reference phase, and a correction circuit configured to correct the phase of the inputted signal by using a detection result of the second phase detector.
    Type: Grant
    Filed: September 11, 2020
    Date of Patent: March 15, 2022
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventors: Masaki Nishikawa, Shoji Ootaka
  • Patent number: 11277139
    Abstract: A phase correcting device includes a local oscillator that includes an all digital phase-locked loop configured to output a local oscillation signal, a first phase detector configured to detect a phase of the local oscillation signal to output the phase of the local oscillation signal, a reference phase device configured to generate a quasi-reference phase corresponding to a reference phase of the local oscillation signal to output the quasi-reference phase, based on a reference clock, a second phase detector configured to detect a fluctuation amount of a phase of the local oscillator, based on the phase detected by the first phase detector and the quasi-reference phase, and a correction circuit configured to correct the phase of the inputted signal by using a detection result of the second phase detector.
    Type: Grant
    Filed: September 11, 2020
    Date of Patent: March 15, 2022
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventor: Masaki Nishikawa
  • Patent number: 11199622
    Abstract: A distance measurement apparatus of an embodiment includes a first device provided in a vehicle and a second device provided in a key-fob, and calculates a distance between the vehicle and the key-fob based on carrier phase detection. In at least one of the first device and the second device, transmission powers at which a plurality of first distance measurement signals are respectively transmitted when the key-fob is inside the vehicle are set to be lower than transmission powers at which a plurality of first distance measurement signals are respectively transmitted when the key-fob is outside the vehicle.
    Type: Grant
    Filed: August 26, 2020
    Date of Patent: December 14, 2021
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventors: Hiroshi Yoshida, Shoji Ootaka, Katsuya Nonin, Masaki Nishikawa, Masayoshi Oshiro
  • Publication number: 20210356548
    Abstract: A distance measuring device according to an embodiment includes a first device including a first transceiver configured to transmit a first known signal and a second known signal and receive a third known signal corresponding to the first known signal and a fourth known signal corresponding to the second known signal, a second device including a second transceiver configured to transmit the third known signal and the fourth known signal and receive the first and second known signals and a calculating section configured to calculate a distance between the first device and the second device on a basis of phases of the first to fourth known signals, and the first transceiver and the second transceiver transmit/receive the first and third known signals one time each and transmit/receive the second and fourth known signals one time each, performing transmission/reception a total of four times.
    Type: Application
    Filed: July 29, 2021
    Publication date: November 18, 2021
    Inventor: Masaki Nishikawa
  • Publication number: 20210297083
    Abstract: A phase correcting device includes a local oscillator that includes an all digital phase-locked loop configured to output a local oscillation signal, a first phase detector configured to detect a phase of the local oscillation signal to output the phase of the local oscillation signal, a reference phase device configured to generate a quasi-reference phase corresponding to a reference phase of the local oscillation signal to output the quasi-reference phase, based on a reference clock, a second phase detector configured to detect a fluctuation amount of a phase of the local oscillator, based on the phase detected by the first phase detector and the quasi-reference phase, and a correction circuit configured to correct the phase of the inputted signal by using a detection result of the second phase detector.
    Type: Application
    Filed: September 11, 2020
    Publication date: September 23, 2021
    Inventor: Masaki Nishikawa
  • Publication number: 20210286065
    Abstract: A ranging apparatus of an embodiment is a ranging apparatus adopting communication type ranging by a phase detection scheme. The ranging apparatus including: a transmitting circuit configured to be able to transmit by a plurality of channels used for data communication and configured to transmit a transmission signal obtained by modulating transmission data; and a control circuit configured to control the transmission circuit to cause a plurality of continuous waves having mutually different frequencies to be generated in a same channel as continuous waves used for ranging by the phase detection scheme.
    Type: Application
    Filed: August 28, 2020
    Publication date: September 16, 2021
    Inventors: Hiroshi Yoshida, Masaki Nishikawa, Shoji Ootaka, Katsuya Nonin, Masayoshi Oshiro
  • Publication number: 20210281267
    Abstract: A phase correcting device includes a local oscillator configured to give a local oscillation signal to a device configured to detect a phase of an inputted signal, a first phase detector configured to detect a phase of the local oscillation signal to output the phase of the local oscillation signal, a reference phase device configured to generate a quasi-reference phase corresponding to a reference phase of the local oscillation signal at a time of an initial setting of the local oscillator to output the quasi-reference phase, based on a reference clock, a second phase detector configured to detect a fluctuation amount of a phase of the local oscillator, based on the phase detected by the first phase detector and the quasi-reference phase, and a correction circuit configured to correct the phase of the inputted signal by using a detection result of the second phase detector.
    Type: Application
    Filed: September 11, 2020
    Publication date: September 9, 2021
    Inventors: Masaki Nishikawa, Shoji Ootaka
  • Publication number: 20210270956
    Abstract: A distance measurement apparatus of an embodiment includes a first device provided in a vehicle and a second device provided in a key-fob, and calculates a distance between the vehicle and the key-fob based on carrier phase detection. In at least one of the first device and the second device, transmission powers at which a plurality of first distance measurement signals are respectively transmitted when the key-fob is inside the vehicle are set to be lower than transmission powers at which a plurality of first distance measurement signals are respectively transmitted when the key-fob is outside the vehicle.
    Type: Application
    Filed: August 26, 2020
    Publication date: September 2, 2021
    Inventors: Hiroshi Yoshida, Shoji Ootaka, Katsuya Nonin, Masaki Nishikawa, Masayoshi Oshiro
  • Patent number: 11105880
    Abstract: A distance measuring device according to an embodiment includes a first device including a first transceiver configured to transmit a first known signal and a second known signal and receive a third known signal corresponding to the first known signal and a fourth known signal corresponding to the second known signal, a second device including a second transceiver configured to transmit the third known signal and the fourth known signal and receive the first and second known signals and a calculating section configured to calculate a distance between the first device and the second device on a basis of phases of the first to fourth known signals, and the first transceiver and the second transceiver transmit/receive the first and third known signals one time each and transmit/receive the second and fourth known signals one time each, performing transmission/reception a total of four times.
    Type: Grant
    Filed: November 19, 2019
    Date of Patent: August 31, 2021
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
    Inventor: Masaki Nishikawa
  • Publication number: 20210181322
    Abstract: A distance measuring device includes a calculating section configured to calculate, based on phase information acquired by a first device and a second device, at least one of which is movable, a distance between the first device and the second device. The first device includes a first reference signal source and a first transceiver configured to transmit two or more first carrier signals and receives two or more second carrier signals using an output of the first reference signal source. The second device includes a second reference signal source configured to operate independently from the first reference signal source and a second transceiver configured to transmit the second carrier signals and receives the first carrier signals using an output of the second reference signal source. The calculating section calculates the distance based on a phase detection result obtained by reception of the first and second carrier signals.
    Type: Application
    Filed: February 24, 2021
    Publication date: June 17, 2021
    Inventors: Shoji Ootaka, Yutaka Shimizu, Ichiro Seto, Yoshiharu Nito, Masaki Nishikawa, Takayuki Kato, Shigeyasu Iwata, Katsuya Nonin
  • Patent number: 10976419
    Abstract: A distance measuring device includes a calculating section configured to calculate, based on phase information acquired by a first device and a second device, at least one of which is movable, a distance between the first device and the second device. The first device includes a first reference signal source and a first transceiver configured to transmit two or more first carrier signals and receives two or more second carrier signals using an output of the first reference signal source. The second device includes a second reference signal source configured to operate independently from the first reference signal source and a second transceiver configured to transmit the second carrier signals and receives the first carrier signals using an output of the second reference signal source. The calculating section calculates the distance based on a phase detection result obtained by reception of the first and second carrier signals.
    Type: Grant
    Filed: September 15, 2017
    Date of Patent: April 13, 2021
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Shoji Ootaka, Yutaka Shimizu, Ichiro Seto, Yoshiharu Nito, Masaki Nishikawa, Takayuki Kato, Shigeyasu Iwata, Katsuya Nonin
  • Publication number: 20210088642
    Abstract: A distance measuring apparatus according to an embodiment includes, a filter section configured to perform band limitation on a transmission signal and output the transmission signal, and to perform band limitation on a reception signal from an antenna section and output the reception signal, a distance measuring section configured to perform a distance measurement computation based on the transmission signal and the reception signal, and to obtain a delay of a signal passing through the filter section and perform calibration of the distance measurement computation, a signal interruption section configured to interrupt transmission of a signal between the filter section and the antenna section, and a control section configured to control the signal interruption section to interrupt the transmission of the signal during a period of the calibration.
    Type: Application
    Filed: March 6, 2020
    Publication date: March 25, 2021
    Inventors: Takayuki Kato, Shoji Ootaka, Tsuneo Suzuki, Masaki Nishikawa, Katsuya Nonin, Hiroshi Yoshida, Yoshiharu Nito, Masayoshi Oshiro
  • Publication number: 20210088646
    Abstract: According to an embodiment, a first device includes: a first transceiver configured to transmit two or more first carrier signals using an output of a first reference signal source and to receive two or more second carrier signals; and a calculation unit, and a second device includes: a second transceiver configured to transmit the two or more second carrier signals using an output of a second reference signal source that operates independently of the first reference signal source and to receive the two or more first carrier signals. A frequency group of the two or more first carrier signals and a frequency group of the two or more second carrier signals are identical or substantially identical to each other, and the calculation unit calculates the distance between the first device and the second device based on a phase detection result obtained by receiving the first and second carrier signals.
    Type: Application
    Filed: March 6, 2020
    Publication date: March 25, 2021
    Inventors: Shoji Ootaka, Takayuki Kato, Masaki Nishikawa, Hiroshi Yoshida, Katsuya Nonin, Yoshiharu Nito, Masayoshi Oshiro