Patents by Inventor Ichiro Seto
Ichiro Seto 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).
-
Patent number: 11719791Abstract: A distance measuring device includes a calculating section that calculates, 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 transceiver that transmits three or more first carrier signals and receives three or more second carrier signals using an output of a first reference signal source. The second device includes a second transceiver that transmits the three or more second carrier signals and receives the three or more first carrier signals using an output of a 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 and corrects the calculated distance based on information concerning an amplitude ratio of the first carrier signals received by the second transceiver.Type: GrantFiled: May 26, 2021Date of Patent: August 8, 2023Assignee: KABUSHIKI KAISHA TOSHIBAInventors: Yutaka Shimizu, Shoji Ootaka, Ichiro Seto, Katsuya Nonin
-
Publication number: 20210333376Abstract: A distance measuring device includes a calculating section that calculates, 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 transceiver that transmits three or more first carrier signals and receives three or more second carrier signals using an output of a first reference signal source. The second device includes a second transceiver that transmits the three or more second carrier signals and receives the three or more first carrier signals using an output of a 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 and corrects the calculated distance based on information concerning an amplitude ratio of the first carrier signals received by the second transceiver.Type: ApplicationFiled: May 26, 2021Publication date: October 28, 2021Inventors: Yutaka Shimizu, Shoji Ootaka, Ichiro Seto, Katsuya Nonin
-
Patent number: 11047961Abstract: A distance measuring device includes a calculating section that calculates, 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 transceiver that transmits three or more first carrier signals and receives three or more second carrier signals using an output of a first reference signal source. The second device includes a second transceiver that transmits the three or more second carrier signals and receives the three or more first carrier signals using an output of a 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 and corrects the calculated distance based on information concerning an amplitude ratio of the first carrier signals received by the second transceiver.Type: GrantFiled: May 26, 2020Date of Patent: June 29, 2021Assignee: Kabushiki Kaisha ToshibaInventors: Tutaka Shimizu, Shoji Ootaka, Ichiro Seto, Katsuya Nonin
-
Publication number: 20210181322Abstract: 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: ApplicationFiled: February 24, 2021Publication date: June 17, 2021Inventors: Shoji Ootaka, Yutaka Shimizu, Ichiro Seto, Yoshiharu Nito, Masaki Nishikawa, Takayuki Kato, Shigeyasu Iwata, Katsuya Nonin
-
Patent number: 10976419Abstract: 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: GrantFiled: September 15, 2017Date of Patent: April 13, 2021Assignee: Kabushiki Kaisha ToshibaInventors: Shoji Ootaka, Yutaka Shimizu, Ichiro Seto, Yoshiharu Nito, Masaki Nishikawa, Takayuki Kato, Shigeyasu Iwata, Katsuya Nonin
-
Publication number: 20200284888Abstract: A distance measuring device includes a calculating section that calculates, 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 transceiver that transmits three or more first carrier signals and receives three or more second carrier signals using an output of a first reference signal source. The second device includes a second transceiver that transmits the three or more second carrier signals and receives the three or more first carrier signals using an output of a 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 and corrects the calculated distance based on information concerning an amplitude ratio of the first carrier signals received by the second transceiver.Type: ApplicationFiled: May 26, 2020Publication date: September 10, 2020Inventors: Yutaka Shimizu, Shoji Ootaka, Ichiro Seto, Katsuya Nonin
-
Patent number: 10728081Abstract: A computer-implemented method of estimating IQ imbalance in a communication system including a transmitter and a receiver. The method includes: defining a system model in which a transmitted signal is affected by TX IQ imbalance, carrier frequency offset (CFO) and RX IQ imbalance; controlling a local oscillator at the transmitter to introduce a known carrier frequency offset (CFO) during a calibration; and estimating unknown parameters in the system model using a pre-defined training sequence to determine the TX IQ imbalance and the RX IQ imbalance.Type: GrantFiled: March 15, 2019Date of Patent: July 28, 2020Assignee: Kabushiki Kaisha ToshibaInventors: Magnus Stig Torsten Sandell, Evgeny Tsimbalo, Ichiro Seto
-
Patent number: 10712435Abstract: A distance measuring device includes a calculating section that calculates, 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 transceiver that transmits three or more first carrier signals and receives three or more second carrier signals using an output of a first reference signal source. The second device includes a second transceiver that transmits the three or more second carrier signals and receives the three or more first carrier signals using an output of a 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 and corrects the calculated distance based on information concerning an amplitude ratio of the first carrier signals received by the second transceiver.Type: GrantFiled: September 15, 2017Date of Patent: July 14, 2020Assignee: Kabushiki Kaisha ToshibaInventors: Yutaka Shimizu, Shoji Ootaka, Ichiro Seto, Katsuya Nonin
-
Patent number: 10644913Abstract: A carrier leakage correction method for a quadrature modulator according to an embodiment includes inputting a test signal with a frequency fBB to a transmitter and up-converting the test signal with a frequency fL0 and down-converting with the frequency fL0. A frequency 2fBB component is detected in the down-converted test signal. One or a plurality of parameters of the transmitter is/are adjusted so as to reduce a magnitude of the detected frequency 2fBB component in the test signal.Type: GrantFiled: January 23, 2019Date of Patent: May 5, 2020Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage CorporationInventors: Yousuke Hagiwara, Shigehito Saigusa, Mitsuyuki Ashida, Yuki Fujimura, Ichiro Seto
-
Patent number: 10419136Abstract: According to an embodiment, a communication device includes a phase-shifting circuit that shifts a phase of a local signal and supplies it to an orthogonal demodulator. The phase-shifting circuit includes first and second signal input ends that are supplied with an output signal of a local oscillator between both ends thereof, a frequency divider that has first and second input ends, and a switching part that is provided between the first and second signal input ends and the first and second input ends of the frequency divider and switches connection between the first and second signal input ends and the first and second input ends of the frequency divider.Type: GrantFiled: September 11, 2017Date of Patent: September 17, 2019Assignee: Kabushiki Kaisha ToshibaInventors: Yousuke Hagiwara, Yuki Fujimura, Hiroyuki Kobayashi, Ichiro Seto, Shigehito Saigusa
-
Publication number: 20190158325Abstract: A carrier leakage correction method for a quadrature modulator according to an embodiment includes inputting a test signal with a frequency fBB to a transmitter and up-converting the test signal with a frequency fL0 and down-converting with the frequency fL0. A frequency 2fBB component is detected in the down-converted test signal. One or a plurality of parameters of the transmitter is/are adjusted so as to reduce a magnitude of the detected frequency 2fBB component in the test signal.Type: ApplicationFiled: January 23, 2019Publication date: May 23, 2019Inventors: Yousuke Hagiwara, Shigehito Saigusa, Mitsuyuki Ashida, Yuki Fujimura, Ichiro Seto
-
Publication number: 20190097851Abstract: A carrier leakage correction method for a quadrature modulator according to an embodiment includes inputting a test signal with a frequency fBB to a transmitter and up-converting the test signal with a frequency fL0 and down-converting with the frequency fL0. A frequency 2fBB component is detected in the down-converted test signal. One or a plurality of parameters of the transmitter is/are adjusted so as to reduce a magnitude of the detected frequency 2fBB component in the test signal.Type: ApplicationFiled: February 21, 2018Publication date: March 28, 2019Inventors: Yousuke Hagiwara, Shigehito Saigusa, Mitsuyuki Ashida, Yuki Fujimura, Ichiro Seto
-
Patent number: 10243771Abstract: An orthogonal frequency division multiplexing (OFDM) signal transmission apparatus which transmits OFDM signals by using a plurality of transmission antennas includes a subcarrier setting device which sets signals for subcarriers so as to use some of the subcarriers of the OFDM signals as pilot subcarriers to transmit pilot signals and use the remaining subcarriers as data subcarriers to transmit data signals, the subcarrier setting device changing polarities of signals for the pilot subcarriers for each transmission antenna.Type: GrantFiled: January 3, 2017Date of Patent: March 26, 2019Assignee: KABUSHIKI KAISHA TOSHIBAInventors: Tsuguhide Aoki, Ichiro Seto, Daisuke Takeda, Takehiko Toyoda, Ren Sakata
-
Patent number: 10225118Abstract: A carrier leakage correction method for a quadrature modulator according to an embodiment includes inputting a test signal with a frequency fBB to a transmitter and up-converting the test signal with a frequency fL0 and down-converting with the frequency fL0. A frequency 2fBB component is detected in the down-converted test signal. One or a plurality of parameters of the transmitter is/are adjusted so as to reduce a magnitude of the detected frequency 2fBB component in the test signal.Type: GrantFiled: February 21, 2018Date of Patent: March 5, 2019Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage CorporationInventors: Yousuke Hagiwara, Shigehito Saigusa, Mitsuyuki Ashida, Yuki Fujimura, Ichiro Seto
-
Publication number: 20180267155Abstract: A distance measuring device includes a calculating section that calculates, 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 transceiver that transmits three or more first carrier signals and receives three or more second carrier signals using an output of a first reference signal source. The second device includes a second transceiver that transmits the three or more second carrier signals and receives the three or more first carrier signals using an output of a 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 and corrects the calculated distance based on information concerning an amplitude ratio of the first carrier signals received by the second transceiver.Type: ApplicationFiled: September 15, 2017Publication date: September 20, 2018Inventors: Yutaka Shimizu, Shoji Ootaka, Ichiro Seto, Katsuya Nonin
-
Publication number: 20180267154Abstract: 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: ApplicationFiled: September 15, 2017Publication date: September 20, 2018Inventors: Shoji Ootaka, Yutaka Shimizu, Ichiro Seto, Yoshiharu Nito, Masaki Nishikawa, Takayuki Kato, Shigeyasu Iwata, Katsuya Nonin
-
Patent number: 10069670Abstract: A transmission and reception circuit includes a transmission circuit, a reception circuit, and a signal feedback path. The transmission path includes an output section, a signal generating circuit generating an in-phase component signal and an orthogonal component signal, and a transmission analog baseband circuit configured to perform digital to analog conversion of the generated in-phase component signal and orthogonal component signal. The reception circuit includes an input section, a reception analog baseband circuit performing analog to digital conversion of the transmitted in-phase component signal and orthogonal component signal, and a signal detection circuit that detects the analog-to-digital converted in-phase component signal and orthogonal component signal converted by the reception analog baseband circuit.Type: GrantFiled: March 1, 2017Date of Patent: September 4, 2018Assignee: Kabushiki Kaisha ToshibaInventors: Shigehito Saigusa, Yousuke Hagiwara, Toshiyuki Yamagishi, Hiroshi Yoshida, Ichiro Seto
-
Publication number: 20180183531Abstract: According to an embodiment, a communication device includes a phase-shifting circuit that shifts a phase of a local signal and supplies it to an orthogonal demodulator. The phase-shifting circuit includes first and second signal input ends that are supplied with an output signal of a local oscillator between both ends thereof, a frequency divider that has first and second input ends, and a switching part that is provided between the first and second signal input ends and the first and second input ends of the frequency divider and switches connection between the first and second signal input ends and the first and second input ends of the frequency divider.Type: ApplicationFiled: September 11, 2017Publication date: June 28, 2018Inventors: Yousuke Hagiwara, Yuki Fujimura, Hiroyuki Kobayashi, Ichiro Seto, Shigehito Saigusa
-
Publication number: 20180083823Abstract: A transmission and reception circuit includes a transmission circuit, a reception circuit, and a signal feedback path. The transmission path includes an output section, a signal generating circuit generating an in-phase component signal and an orthogonal component signal, and a transmission analog baseband circuit configured to perform digital to analog conversion of the generated in-phase component signal and orthogonal component signal. The reception circuit includes an input section, a reception analog baseband circuit performing analog to digital conversion of the transmitted in-phase component signal and orthogonal component signal, and a signal detection circuit that detects the analog-to-digital converted in-phase component signal and orthogonal component signal converted by the reception analog baseband circuit.Type: ApplicationFiled: March 1, 2017Publication date: March 22, 2018Inventors: Shigehito SAIGUSA, Yousuke HAGIWARA, Toshiyuki YAMAGISHI, Hiroshi YOSHIDA, Ichiro SETO
-
Patent number: 9923744Abstract: An orthogonal frequency division multiplexing (OFDM) signal transmission apparatus which transmits OFDM signals by using a plurality of transmission antennas includes a subcarrier setting device which sets signals for subcarriers so as to use some of the subcarriers of the OFDM signals as pilot subcarriers to transmit pilot signals and use the remaining subcarriers as data subcarriers to transmit data signals, the subcarrier setting device changing polarities of signals for the pilot subcarriers for each transmission antenna.Type: GrantFiled: February 18, 2016Date of Patent: March 20, 2018Assignee: KABUSHIKI KAISHA TOSHIBAInventors: Tsuguhide Aoki, Ichiro Seto, Daisuke Takeda, Takehiko Toyoda, Ren Sakata