Patents by Inventor Syuichi Sekine
Syuichi Sekine 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).
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Patent number: 7590400Abstract: In a radio apparatus, the band of a loop filter of a synthesizer in a blank channel searching state is narrower than the band in a communicating state. In addition, a radio wave environment is measured. A characteristic necessary for the radio apparatus is determined corresponding to the measured-radio wave environment. The power is controlled corresponding to the performance of the radio apparatus. Thus, the power consumption is decreased. In addition, the efficiency of the output power is improved. In the radio apparatus, the current consumption of a power amplifier PA is measured. A matching circuit (LNA or MIX) of the antenna is adjusted with the measured result so as to decrease an antenna loss. In the radio apparatus, a DC offset is removed from the transmitted power and the reflected wave. When the DC offset is removed using an AC coupling capacitor, the deterioration of the frequency characteristic of the receiving portion is compensated with a capacitor in a digital signal process.Type: GrantFiled: January 9, 2007Date of Patent: September 15, 2009Assignee: Kabushiki Kaisha ToshibaInventors: Shoji Otaka, Hiroshi Tsurumi, Hiroshi Yoshida, Syuichi Sekine, Hiroyuki Kayano, Tadahiko Maeda
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Patent number: 7502407Abstract: A wireless communication system which transmits and receives a signal by using a plurality of wireless apparatuses, comprising: a first wireless apparatus group having a plurality of transmitting apparatuses, each transmitting a wireless signal based on a first control signal, said first wireless apparatus group forming a first ad-hoc network between said transmitting apparatuses; and a second wireless apparatus group having a plurality of destination apparatuses, each receiving the wireless signal transmitted from said first wireless apparatus group, said second wireless apparatus group transmitting and receiving the wireless signal received by said destination apparatuses based on a second control signal, and said second wireless apparatus group forming a second ad-hoc network between said destination apparatuses different from said first ad-hoc network.Type: GrantFiled: October 24, 2007Date of Patent: March 10, 2009Assignee: Kabushiki Kaisha ToshibaInventors: Ren Sakata, Syuichi Sekine, Mutsumu Serizawa, Hiroki Shoki, Hiroshi Tsurumi, Shuichi Obayashi, Tomoko Adachi, Kiyoshi Toshimitsu, Tsuguhide Aoki
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Patent number: 7489954Abstract: One of objects of a wireless communication apparatus according to the present invention is to realize stable communication regardless of received signal strength indication and information amount. The wireless communication apparatus for communicating in an autonomous distributed wireless network includes a detection unit which generates a detection signal by detecting a first wireless signal from a first wireless apparatus; a wireless circuit which receives a second wireless signal relating to said first wireless signal, transmitted from a second wireless apparatus which received said first wireless signal; a signal estimation unit which estimates said detection signal and the received second wireless signal; a signal selector which selects either said detection signal or the received second wireless signal, based on an estimation result of said signal estimation unit; and a demodulator which demodulates the signal selected by said signal selector.Type: GrantFiled: October 5, 2007Date of Patent: February 10, 2009Assignee: Kabushiki Kaisha ToshibaInventors: Syuichi Sekine, Mutsumu Serizawa, Hiroki Shoki, Hiroshi Tsurumi, Shuichi Obayashi, Kiyoshi Toshimitsu, Tomoko Adachi, Tsuguhide Aoki, Ren Sakata, Ryoko Matsuo
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Patent number: 7386329Abstract: One of objects of a wireless communication apparatus according to the present invention is to realize stable communication regardless of received signal strength indication and information amount. The wireless communication apparatus for communicating in an autonomous distributed wireless network includes a detection unit which generates a detection signal by detecting a first wireless signal from a first wireless apparatus; a wireless circuit which receives a second wireless signal relating to said first wireless signal, transmitted from a second wireless apparatus which received said first wireless signal; a signal estimation unit which estimates said detection signal and the received second wireless signal; a signal selector which selects either said detection signal or the received second wireless signal, based on an estimation result of said signal estimation unit; and a demodulator which demodulates the signal selected by said signal selector.Type: GrantFiled: April 25, 2003Date of Patent: June 10, 2008Assignee: Kabushiki Kaisha ToshibaInventors: Syuichi Sekine, Mutsumu Serizawa, Hiroki Shoki, Hiroshi Tsurumi, Shuichi Obayashi, Kiyoshi Toshimitsu, Tomoko Adachi, Tsuguhide Aoki, Ren Sakata, Ryoko Matsuo
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Publication number: 20080049665Abstract: A wireless communication system which transmits and receives a signal by using a plurality of wireless apparatuses, comprising: a first wireless apparatus group having a plurality of transmitting apparatuses, each transmitting a wireless signal based on a first control signal, said first wireless apparatus group forming a first ad-hoc network between said transmitting apparatuses; and a second wireless apparatus group having a plurality of destination apparatuses, each receiving the wireless signal transmitted from said first wireless apparatus group, said second wireless apparatus group transmitting and receiving the wireless signal received by said destination apparatuses based on a second control signal, and said second wireless apparatus group forming a second ad-hoc network between said destination apparatuses different from said first ad-hoc network.Type: ApplicationFiled: October 24, 2007Publication date: February 28, 2008Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Ren Sakata, Syuichi Sekine, Mutsumu Serizawa, Hiroki Shoki, Hiroshi Tsurumi, Shuichi Obayashi, Tomoko Adachi, Kiyoshi Toshimitsu, Tsuguhide Aoki
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Publication number: 20080032757Abstract: One of objects of a wireless communication apparatus according to the present invention is to realize stable communication regardless of received signal strength indication and information amount. The wireless communication apparatus for communicating in an autonomous distributed wireless network includes a detection unit which generates a detection signal by detecting a first wireless signal from a first wireless apparatus; a wireless circuit which receives a second wireless signal relating to said first wireless signal, transmitted from a second wireless apparatus which received said first wireless signal; a signal estimation unit which estimates said detection signal and the received second wireless signal; a signal selector which selects either said detection signal or the received second wireless signal, based on an estimation result of said signal estimation unit; and a demodulator which demodulates the signal selected by said signal selector.Type: ApplicationFiled: October 5, 2007Publication date: February 7, 2008Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Syuichi SEKINE, Mutsumu Serizawa, Hiroki Shoki, Hiroshi Tsurumi, Shuichi Obayashi, Kiyoshi Toshimitsu, Tomoko Adachi, Tsuguhide Aoki, Ren Sakata, Ryoko Matsuo
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Patent number: 7319714Abstract: A wireless communication system which transmits and receives a signal by using a plurality of wireless apparatuses, comprising: a first wireless apparatus group having a plurality of transmitting apparatuses, each transmitting a wireless signal based on a first control signal, said first wireless apparatus group forming a first ad-hoc network between said transmitting apparatuses; and a second wireless apparatus group having a plurality of destination apparatuses, each receiving the wireless signal transmitted from said first wireless apparatus group, said second wireless apparatus group transmitting and receiving the wireless signal received by said destination apparatuses based on a second control signal, and said second wireless apparatus group forming a second ad-hoc network between said destination apparatuses different from said first ad-hoc network.Type: GrantFiled: May 19, 2003Date of Patent: January 15, 2008Assignee: Kabushiki Kaisha ToshibaInventors: Ren Sakata, Syuichi Sekine, Mutsumu Serizawa, Hiroki Shoki, Hiroshi Tsurumi, Shuichi Obayashi, Tomoko Adachi, Kiyoshi Toshimitsu, Tsuguhide Aoki
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Publication number: 20070111673Abstract: In a radio apparatus, the band of a loop filter of a synthesizer in a blank channel searching state is narrower than the band in a communicating state. In addition, a radio wave environment is measured. A characteristic necessary for the radio apparatus is determined corresponding to the measured-radio wave environment. The power is controlled corresponding to the performance of the radio apparatus. Thus, the power consumption is decreased. In addition, the efficiency of the output power is improved. In the radio apparatus, the current consumption of a power amplifier PA is measured. A matching circuit (LNA or MIX) of the antenna is adjusted with the measured result so as to decrease an antenna loss. In the radio apparatus, a DC offset is removed from the transmitted power and the reflected wave. When the DC offset is removed using an AC coupling capacitor, the deterioration of the frequency characteristic of the receiving portion is compensated with a capacitor in a digital signal process.Type: ApplicationFiled: January 9, 2007Publication date: May 17, 2007Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Shoji OTAKA, Hiroshi Tsurumi, Hiroshi Yoshida, Syuichi Sekine, Hiroyuki Kayano, Tadahiko Maeda
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Patent number: 7194262Abstract: An object of the present invention is to provide a wireless communication system, a wireless communication system, comprising: one or more wireless base station; and a plurality of wireless terminals capable of communicating with said wireless base station by wireless, two or more of said wireless terminals capable of communicating with each other by wireless thereby forming a wireless terminal group; wherein said wireless base station has a representative determination unit configured to determine at least one wireless terminal belonging to said wireless terminal group as a representative terminal; and said representative terminal receives first frames transmitted from other wireless terminals belonging to said wireless terminal group, and transmits the received first frames to said wireless base station.Type: GrantFiled: May 19, 2003Date of Patent: March 20, 2007Assignee: Kabushiki Kaisha ToshibaInventors: Tsuguhide Aoki, Tomoko Adachi, Kiyoshi Toshimitsu, Syuichi Sekine, Mutsumu Serizawa, Hiroki Shoki, Hiroshi Tsurumi, Shuichi Obayashi, Ren Sakata
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Patent number: 7184738Abstract: In a radio apparatus, the band of a loop filter of a synthesizer in a blank channel searching state is narrower than the band in a communicating state. In addition, a radio wave environment is measured. A characteristic necessary for the radio apparatus is determined corresponding to the measured-radio wave environment. The power is controlled corresponding to the performance of the radio apparatus. Thus, the power consumption is decreased. In addition, the efficiency of the output power is improved. In the radio apparatus, the current consumption of a power amplifier PA is measured. A matching circuit (LNA or MIX) of the antenna is adjusted with the measured result so as to decrease an antenna loss. In the radio apparatus, a DC offset is removed from the transmitted power and the reflected wave. When the DC offset is removed using an AC coupling capacitor, the deterioration of the frequency characteristic of the receiving portion is compensated with a capacitor in a digital signal process.Type: GrantFiled: October 5, 2004Date of Patent: February 27, 2007Assignee: Kabushiki Kaisha ToshibaInventors: Shoji Otaka, Hiroshi Tsurumi, Hiroshi Yoshida, Syuichi Sekine, Hiroyuki Kayano, Tadahiko Maeda
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Patent number: 7079878Abstract: A portable radio terminal comprises a housing, a radio circuit included in the housing, a matching circuit mounted on the top of the housing at a position which is offset from the longitudinal center line of the housing, a load connected to the tip of the matching circuit, and a linear antenna connected to the load. This portable radio terminal further comprises load changing means for changing the value of the load. The matching circuit may comprise a meander matching element, a zigzag-shaped matching element, a helical matching element, a conical matching element, a rectangular helical matching element or a pyramid helical matching element which are formed so as to a predetermined shape, such as a meander shape, a zigzag shape, a helical shape, a conical shape, a rectangular helical shape or pyramid helical shape.Type: GrantFiled: January 22, 2004Date of Patent: July 18, 2006Assignee: Kabushiki Kaisha ToshibaInventors: Noriaki Odachi, Syuichi Sekine
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Patent number: 6911944Abstract: An antenna apparatus is constituted by first, second, third, and fourth wire antenna elements and a connection element. The sum of the lengths of the first, second, and fourth wire antenna elements is ¼ the wavelength corresponding to a series-resonance frequency of the first, second, and fourth wire antenna elements. The sum of the lengths of the second, third, and fourth wire antenna elements is ½ the wavelength corresponding to a parallel-resonance frequency of the second, third, and fourth wire antenna elements. The sum of the lengths of the first and third wire antenna elements is ¼ the wavelength corresponding to a series-resonance frequency of the first and third wire antenna elements. The parallel-resonance frequency is higher than the series-resonance frequency of the first, second, and fourth wire antenna elements and lower than the series-resonance frequency of the first and third wire antenna elements.Type: GrantFiled: October 23, 2003Date of Patent: June 28, 2005Assignee: Kabushiki Kaisha ToshibaInventors: Syuichi Sekine, Takayoshi Ito, Yasushi Murakami, Hiroki Shoki
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Publication number: 20050042994Abstract: In a radio apparatus, the band of a loop filter of a synthesizer in a blank channel searching state is narrower than the band in a communicating state. In addition, a radio wave environment is measured. A characteristic necessary for the radio apparatus is determined corresponding to the measured-radio wave environment. The power is controlled corresponding to the performance of the radio apparatus. Thus, the power consumption is decreased. In addition, the efficiency of the output power is improved. In the radio apparatus, the current consumption of a power amplifier PA is measured. A matching circuit (LNA or MIX) of the antenna is adjusted with the measured result so as to decrease an antenna loss. In the radio apparatus, a DC offset is removed from the transmitted power and the reflected wave. When the DC offset is removed using an AC coupling capacitor, the deterioration of the frequency characteristic of the receiving portion is compensated with a capacitor in a digital signal process.Type: ApplicationFiled: October 5, 2004Publication date: February 24, 2005Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Shoji Otaka, Hiroshi Tsurumi, Hiroshi Yoshida, Syuichi Sekine, Hiroyuki Kayano, Tadahiko Maeda
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Patent number: 6816712Abstract: In a radio apparatus, the band of a loop filter of a synthesizer in a blank channel searching state is narrower than the band in a communicating state. In addition, a radio wave environment is measured. A characteristic necessary for the radio apparatus is determined corresponding to the measured radio wave environment. The power is controlled corresponding to the performance of the radio apparatus. Thus, the power consumption is decreased. In addition, the efficiency of the output power is improved. In the radio apparatus, the current consumption of a power amplifier PA is measured. A matching circuit (LNA or MIX) of the antenna is adjusted with the measured result so as to decrease an antenna loss. In the radio apparatus, a DC offset is removed from the transmitted power and the reflected wave. When the DC offset is removed using an AC coupling capacitor, the deterioration of the frequency characteristic of the receiving portion is compensated with a capacitor in a digital signal process.Type: GrantFiled: November 23, 2001Date of Patent: November 9, 2004Assignee: Kabushiki Kaisha ToshibaInventors: Shoji Otaka, Hiroshi Tsurumi, Hiroshi Yoshida, Syuichi Sekine, Hiroyuki Kayano, Tadahiko Maeda
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Publication number: 20040152497Abstract: A portable radio terminal comprises a housing, a radio circuit included in the housing, a matching circuit mounted on the top of the housing at a position which is offset from the longitudinal center line of the housing, a load connected to the tip of the matching circuit, and a linear antenna connected to the load. This portable radio terminal further comprises load changing means for changing the value of the load. The matching circuit may comprise a meander matching element, a zigzag-shaped matching element, a helical matching element, a conical matching element, a rectangular helical matching element or a pyramid helical matching element which are formed so as to a predetermined shape, such as a meander shape, a zigzag shape, a helical shape, a conical shape, a rectangular helical shape or pyramid helical shape.Type: ApplicationFiled: January 22, 2004Publication date: August 5, 2004Applicant: Kabushiki Kaisha ToshibaInventors: Noriaki Odachi, Syuichi Sekine
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Publication number: 20040080458Abstract: An antenna apparatus is constituted by first, second, third, and fourth wire antenna elements and a connection element. The sum of the lengths of the first, second, and fourth wire antenna elements is ¼ the wavelength corresponding to a series-resonance frequency of the first, second, and fourth wire antenna elements. The sum of the lengths of the second, third, and fourth wire antenna elements is ½ the wavelength corresponding to a parallel-resonance frequency of the second, third, and fourth wire antenna elements. The sum of the lengths of the first and third wire antenna elements is ¼ the wavelength corresponding to a series-resonance frequency of the first and third wire antenna elements. The parallel-resonance frequency is higher than the series-resonance frequency of the first, second, and fourth wire antenna elements and lower than the series-resonance frequency of the first and third wire antenna elements.Type: ApplicationFiled: October 23, 2003Publication date: April 29, 2004Inventors: Syuichi Sekine, Takayoshi Ito, Yasushi Murakami, Hiroki Shoki
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Patent number: 6701167Abstract: A portable radio terminal comprises a housing, a radio circuit included in the housing, a matching circuit mounted on the top of the housing at a position which is offset from the longitudinal center line of the housing, a load connected to the tip of the matching circuit, and a linear antenna connected to the load. This portable radio terminal further comprises load changing means for changing the value of the load. The matching circuit may comprise a meander matching element, a zigzag-shaped matching element, a helical matching element, a conical matching element, a rectangular helical matching element or a pyramid helical matching element which are formed so as to a predetermined shape, such as a meander shape, a zigzag shape, a helical shape, a conical shape, a rectangular helical shape or pyramid helical shape.Type: GrantFiled: February 7, 2001Date of Patent: March 2, 2004Assignee: Kabushiki Kaisha ToshibaInventors: Noriaki Odachi, Syuichi Sekine
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Patent number: 6683575Abstract: An antenna apparatus is constituted by first, second, third, and fourth wire antenna elements and a connection element. The sum of the lengths of the first, second, and fourth wire antenna elements is ¼ the wavelength corresponding to a series-resonance frequency of the first, second, and fourth wire antenna elements. The sum of the lengths of the second, third, and fourth wire antenna elements is ½ the wavelength corresponding to a parallel-resonance frequency of the second, third, and fourth wire antenna elements. The sum of the lengths of the first and third wire antenna elements is ¼ the wavelength corresponding to a series-resonance frequency of the first and third wire antenna elements. The parallel-resonance frequency is higher than the series-resonance frequency of the first, second, and fourth wire antenna elements and lower than the series-resonance frequency of the first and third wire antenna elements.Type: GrantFiled: July 5, 2002Date of Patent: January 27, 2004Assignee: Kabushiki Kaisha ToshibaInventors: Syuichi Sekine, Takayoshi Ito, Yasushi Murakami, Hiroki Shoki
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Publication number: 20030236082Abstract: An object of the present invention is to provide a wireless communication system, a wireless communication system, comprising: one or more wireless base station; and a plurality of wireless terminals capable of communicating with said wireless base station by wireless, two or more of said wireless terminals capable of communicating with each other by wireless thereby forming a wireless terminal group; wherein said wireless base station has a representative determination unit configured to determine at least one wireless terminal belonging to said wireless terminal group as a representative terminal; and said representative terminal receives first frames transmitted from other wireless terminals belonging to said wireless terminal group, and transmits the received first frames to said wireless base station.Type: ApplicationFiled: May 19, 2003Publication date: December 25, 2003Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Tsuguhide Aoki, Tomoko Adachi, Kiyoshi Toshimitsu, Syuichi Sekine, Mutsumu Serizawa, Hiroki Shoki, Hiroshi Tsurumi, Shuichi Obayashi, Ren Sakata
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Publication number: 20030236069Abstract: A wireless communication system which transmits and receives a signal by using a plurality of wireless apparatuses, comprising: a first wireless apparatus group having a plurality of transmitting apparatuses, each transmitting a wireless signal based on a first control signal, said first wireless apparatus group forming a first ad-hoc network between said transmitting apparatuses; and a second wireless apparatus group having a plurality of destination apparatuses, each receiving the wireless signal transmitted from said first wireless apparatus group, said second wireless apparatus group transmitting and receiving the wireless signal received by said destination apparatuses based on a second control signal, and said second wireless apparatus group forming a second ad-hoc network between said destination apparatuses different from said first ad-hoc network.Type: ApplicationFiled: May 19, 2003Publication date: December 25, 2003Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Ren Sakata, Syuichi Sekine, Mutsumu Serizawa, Hiroki Shoki, Hiroshi Tsurumi, Shuichi Obayashi, Tomoko Adachi, Kiyoshi Toshimitsu, Tsuguhide Aoki