Patents by Inventor Toshiyuki Wakisaka
Toshiyuki Wakisaka 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: 8847751Abstract: A first communication apparatus 100 transmits a pilot signal which was generated by a pilot signal generation section 14, at predetermined timing, and detects an unbalance component of a transmission line 300 at the time of pilot signal transmission in an unbalance component detection section 13, and controls a transmission signal in such a manner that an unbalance component is reduced by a transmission control section 12 on the basis of the detected unbalance component.Type: GrantFiled: December 22, 2005Date of Patent: September 30, 2014Assignee: Panasonic CorporationInventors: Fumio Ichihara, Akihiro Yamashita, Hidekazu Matsunobu, Nobutaka Kodama, Masahiro Maki, Tsunehiro Hanada, Yuji Igata, Toshiyuki Wakisaka, Kazuaki Kusune, Mutsuhiko Oishi, Ryota Yukizane
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Patent number: 8139759Abstract: A line state detecting apparatus provided in a balanced transmission system includes, in transmission lines comprising a pair of conductors W1, W2 connected to a transmitting portion 13, current transformers T11, T12 primary sides of which are inserted to respectives thereof in series therewith and secondary sides of which are connected in series to cancel currents or voltages of the two transformer by each other, and a detecting portion 11 for detecting currents or voltages on secondary sides of the current transformers T11, T12. By an output of the detecting portion 11, a difference of currents or voltages of the conductors W1, W2 of the transmission lines is provided and an unbalance component between the conductors W1, W2 is detected.Type: GrantFiled: April 14, 2005Date of Patent: March 20, 2012Assignee: Panasonic CorporationInventors: Fumio Ichihara, Akihiro Yamashita, Tsunehiro Hanada, Mutsuhiko Oishi, Toshiyuki Wakisaka, Masahiro Maki
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Patent number: 7949056Abstract: A balanced transmission signal Tx (t) (voltage e, ?e) is applied to a transmission line (L1, L2), a suppression signal (ec) is generated from a common mode suppression signal source (ec), and the suppression signal (ec) is superposed on respectives of balanced transmission signals via adders (15a, 15b). By pertinently controlling a level of the suppression signal (ec), voltage levels and phases of respectives of the transmission signals transmitted to the transmission lines (L1, L2) are controlled.Type: GrantFiled: April 14, 2005Date of Patent: May 24, 2011Assignee: Panasonic CorporationInventors: Akihiro Yamashita, Fumio Ichihara, Tsunehiro Hanada, Mutsuhiko Oishi, Toshiyuki Wakisaka, Masahiro Maki
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Patent number: 7924940Abstract: A communication network system sets communication parameters which enable an operation under a maximum possible communication rate in a situation where a transmission path has cyclic noise/impedance fluctuations. A transmission/reception apparatus 100 transmits training packets for checking the state of the power line at two distinct points in time. A transmission/reception apparatus analyzes SNR at each carrier frequency, and stores an SNR evaluation result. The transmission/reception apparatus compares two SNR evaluation results which are obtained through two instances of a channel estimation algorithm, selects an SNR evaluation result which dictates a faster PHY rate, and transmits it to the transmission/reception apparatus. The transmission/reception apparatus changes modulation/demodulation rules based on the received SNR analytical result.Type: GrantFiled: July 17, 2009Date of Patent: April 12, 2011Assignee: Panasonic CorporationInventors: Akio Kurobe, Shigeo Yoshida, Tomohiro Kimura, Yuji Igata, Masahiro Maki, Toshiyuki Wakisaka, Hisao Koga, Mutsuhiko Oishi
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Patent number: 7864658Abstract: A multicarrier communication method selects carriers on the basis of an SN-ratio and the balancing of a transmission line. Available carriers are selected in accordance with the balancing of the balanced transmission line, in which the balancing is measured at either a sending terminal or a receiving terminal or alternatively at both, and the SN-ratio is measured between the sending terminal and the receiving terminal. Additionally, a modulation method having the greatest permissible multivalue is selected for each of the carriers, wherein the carriers are selected in light of the SN-ratio and balancing, or alternatively in a highest-to-lowest order of frequency. Transmission power is controlled for each of the carriers to suppress radiated emission, and the SN-ratio and balancing are measured at predetermined time intervals to renew the selection of the carriers and the selection of the modulation methods.Type: GrantFiled: September 14, 2004Date of Patent: January 4, 2011Assignee: Panasonic CorporationInventors: Toshiyuki Wakisaka, Masahiro Maki, Hisao Koga, Yuji Igata, Fumio Ichihara, Akihiro Yamashita, Tsunehiro Hanada, Mutsuhiko Oishi
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Patent number: 7684502Abstract: A communication network system sets communication parameters which enable an operation under a maximum possible communication rate in a situation where a transmission path has cyclic noise/impedance fluctuations. A transmission/reception apparatus transmits training packets for checking the state of the power line at two distinct points in time. A transmission/reception apparatus analyzes SNR at each carrier frequency, and stores an SNR evaluation result. The transmission/reception apparatus compares two SNR evaluations results which are obtained through two instances of a channel estimation algorithm, selects an SNR evaluation result which dictates a faster PHY rate, and transmits it to the transmission/reception apparatus. The transmission/reception apparatus changes modulation/demodulation rules based on the received SNR analytical result.Type: GrantFiled: July 21, 2004Date of Patent: March 23, 2010Assignee: Panasonic CorporationInventors: Akio Kurobe, Shigeo Yoshida, Tomohiro Kimura, Yuji Igata, Masahiro Maki, Toshiyuki Wakisaka, Hisao Koga, Mutsuhiko Oishi
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Patent number: 7633964Abstract: It is an object of the invention to provide a communication apparatus, a communication system and a communication method enabling efficient transmission in accordance with a situation of a wired transmission line and capable of reducing an influence by a radiation power of the transmission line. The communication apparatus of the invention executes wired transmission using a plurality of sub carriers and includes a transmission signal generator for generating a transmission signal, and a transmission signal controller for controlling a transmission power of the transmission signal generated by the transmission signal generator based on a radiation power in a transmission line in correspondence with a frequency of the sub carrier, and a transmitter for transmitting the transmission signal the transmission power of which is controlled by the transmission signal controller via the transmission line.Type: GrantFiled: May 27, 2005Date of Patent: December 15, 2009Assignee: Panasonic CorporationInventors: Mutsuhiko Oishi, Tsunehiro Hanada, Fumio Ichihara, Akihiro Yamashita, Masahiro Maki, Toshiyuki Wakisaka
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Publication number: 20090279638Abstract: A communication network system sets communication parameters which enable an operation under a maximum possible communication rate in a situation where a transmission path has cyclic noise/impedance fluctuations. A transmission/reception apparatus 100 transmits training packets for checking the state of the power line at two distinct points in time. A transmission/reception apparatus analyzes SNR at each carrier frequency, and stores an SNR evaluation result. The transmission/reception apparatus compares two SNR evaluation results which are obtained through two instances of a channel estimation algorithm, selects an SNR evaluation result which dictates a faster PHY rate, and transmits it to the transmission/reception apparatus. The transmission/reception apparatus changes modulation/demodulation rules based on the received SNR analytical result.Type: ApplicationFiled: July 17, 2009Publication date: November 12, 2009Inventors: Akio KUROBE, Shigeo Yoshida, Tomohiro Kimura, Yuji Igata, Masahiro Maki, Toshiyuki Wakisaka, Hisao Koga, Mutsuhiko Oishi
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Patent number: 7391332Abstract: A radiation information management device comprises a measuring unit, a comparing unit, and a management information generating unit. The measuring unit measures unwanted radio wave radiation radiated from a balanced transmission line. The comparing unit compares a measured value of unwanted radio wave radiation, which the measuring unit has measured, with a reference value that is predetermined, and then notifies the comparison result to the management information generating unit. The management information generating unit refers the comparison result, generates the management information related to the unwanted radio wave radiation including information showing that the measured value is exceeded the reference value, then notifies to a first communication device and a second communication device. The first communication device and the second communication device take a measure to reduce transmitting power based on the management information regarding the unwanted radio wave radiation.Type: GrantFiled: March 22, 2005Date of Patent: June 24, 2008Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Toshiyuki Wakisaka, Masahiro Maki, Tsunehiro Hanada, Mutsuhiko Oishi, Fumio Ichihara, Akihiro Yamashita
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Publication number: 20080107242Abstract: A first communication apparatus 100 transmits a pilot signal which was generated by a pilot signal generation section 14, at predetermined timing, and detects an unbalance component of a transmission line 300 at the time of pilot signal transmission in an unbalance component detection section 13, and controls a transmission signal in such a manner that an unbalance component is reduced by a transmission control section 12 on the basis of the detected unbalance component.Type: ApplicationFiled: December 22, 2005Publication date: May 8, 2008Applicant: Matsushita Electric Industrial Co., Ltd.Inventors: Fumio Ichihara, Akihiro Yamashita, Hidekazu Matsunobu, Nobutaka Kodama, Masahiro Maki, Tsunehiro Hanada, Yuji Igata, Toshiyuki Wakisaka, Kazuaki Kusune, Mutsuhiko Oishi, Ryota Yukizane
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Patent number: 7319384Abstract: A communication apparatus includes a transmission signal generation section 1, a transmission signal control section 2, a transmission section 3, a leakage electric power detection section 4, and an electric power control judgment section 5. The transmission signal generation section 1 generates a transmission signal for carrying out transmission using a plurality of sub-carriers, under control of the transmission signal control section 2, and has a transmission electric power control function with respect to each sub-carrier. The leakage electric power detection section 4 detects electric power which is leaked from a transmission line 9 among transmission electric power.Type: GrantFiled: December 27, 2005Date of Patent: January 15, 2008Assignee: Matsushita Electric Industrial Co., LtdInventors: Toshiyuki Wakisaka, Yuji Igata, Kazuaki Kusune, Akihiro Yamashita, Fumio Ichihara
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Patent number: 7123938Abstract: A card device to be inserted into a slot of an electronic apparatus having an electronic apparatus ground and electrically connected to this electronic apparatus, including a single antenna provided on a carrier, a card ground which is disposed on the carrier and electrically connected to the antenna, and a switch for carrying out, at a high frequency, a connection/disconnection of the card ground to/from the electronic apparatus ground in a condition where this card device is inserted in the slot.Type: GrantFiled: July 17, 2002Date of Patent: October 17, 2006Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Shouichi Koga, Michinori Kishimoto, Toshiyuki Wakisaka, Masami Wada
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Publication number: 20060138862Abstract: A communication apparatus includes a transmission signal generation section 1, a transmission signal control section 2, a transmission section 3, a leakage electric power detection section 4, and an electric power control judgment section 5. The transmission signal generation section 1 generates a transmission signal for carrying out transmission using a plurality of sub-carriers, under control of the transmission signal control section 2, and has a transmission electric power control function with respect to each sub-carrier. The leakage electric power detection section 4 detects electric power which is leaked from a transmission line 9 among transmission electric power.Type: ApplicationFiled: December 27, 2005Publication date: June 29, 2006Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.Inventors: Toshiyuki Wakisaka, Yuji Igata, Kazuaki Kusune, Akihiro Yamashita, Fumio Ichihara
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Patent number: 7035612Abstract: An antenna diversity communications device switches communications paths between a plurality of antennas to improve reception in a frequency diversity communications system. Antenna selection is done in response to measurement of the receiving condition of the selected antenna. A memory unit stores frequency difference information between the current channel and the next channel. When the frequency difference between the current channel and the next channel is small enough to predict good correlation between the channels, and if current receiving conditions are good, the current channel remains connected. When the frequency difference between the current channel and the next channel is large enough to predict poor correlation, or if the receiving conditions on the current channel are bad, one of the other channels is selected.Type: GrantFiled: January 16, 2002Date of Patent: April 25, 2006Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Michinori Kishimoto, Toshiyuki Wakisaka, Shoichi Koga, Masami Wada
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Publication number: 20050238107Abstract: A balanced transmission signal Tx (t) (voltage e, ?e) is applied to a transmission line (L1, L2), a suppression signal (ec) is generated from a common mode suppression signal source (ec), and the suppression signal (ec) is superposed on respectives of balanced transmission signals via adders (15a, 15b). By pertinently controlling a level of the suppression signal (ec), voltage levels and phases of respectives of the transmission signals transmitted to the transmission lines (L1, L2) are controlled.Type: ApplicationFiled: April 14, 2005Publication date: October 27, 2005Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.Inventors: Akihiro Yamashita, Fumio Ichihara, Tsunehiro Hanada, Mutsuhiko Oishi, Toshiyuki Wakisaka, Masahiro Maki
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Publication number: 20050232412Abstract: A line state detecting apparatus provided in a balanced transmission system includes, in transmission lines comprising a pair of conductors W1, W2 connected to a transmitting portion 13, current transformers T11, T12 primary sides of which are inserted to respectives thereof in series therewith and secondary sides of which are connected in series to cancel currents or voltages of the two transformer by each other, and a detecting portion 11 for detecting currents or voltages on secondary sides of the current transformers T11, T12. By an output of the detecting portion 11, a difference of currents or voltages of the conductors W1, W2 of the transmission lines is provided and an unbalance component between the conductors W1, W2 is detected.Type: ApplicationFiled: April 14, 2005Publication date: October 20, 2005Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.Inventors: Fumio Ichihara, Akihiro Yamashita, Tsunehiro Hanada, Mutsuhiko Oishi, Toshiyuki Wakisaka, Masahiro Maki
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Publication number: 20050231040Abstract: A radiation information management device comprises a measuring unit, a comparing unit, and a management information generating unit. The measuring unit measures unwanted radio wave radiation radiated from a balanced transmission line. The comparing unit compares a measured value of unwanted radio wave radiation, which the measuring unit has measured, with a reference value that is predetermined, and then notifies the comparison result to the management information generating unit. The management information generating unit refers the comparison result, generates the management information related to the unwanted radio wave radiation including information showing that the measured value is exceeded the reference value, then notifies to a first communication device and a second communication device. The first communication device and the second communication device take a measure to reduce transmitting power based on the management information regarding the unwanted radio wave radiation.Type: ApplicationFiled: March 22, 2005Publication date: October 20, 2005Inventors: Toshiyuki Wakisaka, Masahiro Maki, Tsunehiro Hanada, Mutsuhiko Oishi, Fumio Ichihara, Akihiro Yamashita
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Publication number: 20050190725Abstract: Reception level frequency distribution is determined. A frequency correlation bandwidth is determined in accordance with intervals between peaks or dips, or alternatively intervals between intersections wherein the reception level frequency distribution intersects a threshold. At the time of reception start, a training mode period is set up to determine a frequency correlation bandwidth. After the training mode period, signals are received in accordance with the determined frequency correlation bandwidth. The frequency correlation bandwidth is determined with increased precision to avoid a large amount of calculation such as Fourier transform. As a result, the entire diversity reception processing requires a reduced amount of calculation.Type: ApplicationFiled: October 2, 2003Publication date: September 1, 2005Inventors: Toshiyuki Wakisaka, Shouichi Koga, Michinori Kishimoto, Masami Wada
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Publication number: 20050078803Abstract: In a multicarrier communication using a balanced transmission line such as a power line, a multicarrier communication method operable to select carriers on the basis of an SN-ratio and balancing of the transmission line is provided. Available carriers are selected in accordance with the balancing of the balanced transmission line, in which the balancing is measured at either a sending terminal or a receiving terminal or alternatively at both of them, and the SN-ratio measured between the sending terminal and the receiving terminal. More specifically, any frequency domain having poor balancing and a poor SN-ratio is treated as a non-carrier-employing domain, and consequently the available carriers are selected at other frequency domains. In addition, a modulation method having the greatest permissible multivalue is selected for each of the carriers. The carriers are selected in light of the SN-ratio and balancing, or alternatively in highest-to-lowest order of frequency.Type: ApplicationFiled: September 14, 2004Publication date: April 14, 2005Inventors: Toshiyuki Wakisaka, Masahiro Maki, Hisao Koga, Yuji Igata, Fumio Ichihara, Akihiro Yamashita, Tsunehiro Hanada, Mutsuhiko Oishi
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Publication number: 20050018784Abstract: There is provided a communication network system which can set communication parameters which enable an operation under a maximum possible communication rate in a situation where a transmission path has cyclic noise/impedance fluctuations, without being influenced by such local noise/impedance fluctuations. A transmission/reception apparatus 100 transmits training packets for checking the state of the power line at two distinct points in time. Each time a training packet is received, a transmission/reception apparatus 101 analyzes SNR at each carrier frequency, and stores an SNR evaluation result. The transmission/reception apparatus 101 compares two SNR evaluation results which are obtained through two instances of a channel estimation algorithm, selects an SNR evaluation result which dictates a faster PHY rate, and transmits it to the transmission/reception apparatus 100. The transmission/reception apparatus 100 changes modulation/demodulation rules based on the received SNR analytical result.Type: ApplicationFiled: July 21, 2004Publication date: January 27, 2005Inventors: Akio Kurobe, Shigeo Yoshida, Tomohiro Kimura, Yuji Igata, Masahiro Maki, Toshiyuki Wakisaka, Hisao Koga, Mutsuhiko Oishi