Patents by Inventor Kazuhiko Shibuya
Kazuhiko Shibuya 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: 10771132Abstract: Disclosed is a MIMO system including a transmitter and a receiver, in which an overall BER characteristic is improved. The transmitter (1) maps data, distributed among transmit antennas, onto an IQ plane to generate carrier symbols, and then, applies an inter-polarization interleave processing in a time direction to the carrier symbols between the transmit antennas, to generate OFDM signals. Receiving the OFDM signals, the receiver (2) demodulates the OFDM signals to generate complex baseband signals, and after that, applies a first deinterleave processing in a time direction to the complex baseband signals to generate time deinterleaved data. Further, the receiver (2) applies a MIMO separation processing to the time deinterleaved data to generate a plurality of sets of MIMO separated data and applies a second deinterleave processing between the receive antennas to the plurality of sets of MIMO separated data, so as to generate carrier symbols.Type: GrantFiled: February 9, 2016Date of Patent: September 8, 2020Assignees: NIPPON HOSO KYOKAI, NHK Engineering System, Inc.Inventors: Shingo Asakura, Madoka Honda, Kenichi Murayama, Takuya Shitomi, Susumu Saito, Yoshikazu Narikiyo, Hiroaki Miyasaka, Akihiko Satou, Tomoaki Takeuchi, Kenichi Tsuchida, Masahiro Okano, Masayuki Takada, Kazuhiko Shibuya
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Patent number: 10009078Abstract: Disclosed is a MIMO system including a transmitter and a receiver, in which an overall BER characteristic is improved. The transmitter (1) maps data, distributed among transmit antennas, onto an IQ plane to generate carrier symbols, and then, applies an inter-polarization interleave processing in a time direction to the carrier symbols between the transmit antennas, to generate OFDM signals. Receiving the OFDM signals, the receiver (2) demodulates the OFDM signals to generate complex baseband signals, and after that, applies a first deinterleave processing in a time direction to the complex baseband signals to generate time deinterleaved data. Further, the receiver (2) applies a MIMO separation processing to the time deinterleaved data to generate a plurality of sets of MIMO separated data and applies a second deinterleave processing between the receive antennas to the plurality of sets of MIMO separated data, so as to generate carrier symbols.Type: GrantFiled: February 9, 2016Date of Patent: June 26, 2018Assignees: NIPPON HOSO KYOKAI, NHK Engineering System, Inc.Inventors: Shingo Asakura, Madoka Honda, Kenichi Murayama, Takuya Shitomi, Susumu Saito, Yoshikazu Narikiyo, Hiroaki Miyasaka, Akihiko Satou, Tomoaki Takeuchi, Kenichi Tsuchida, Masahiro Okano, Masayuki Takada, Kazuhiko Shibuya
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Publication number: 20180038942Abstract: Disclosed is a MIMO system including a transmitter and a receiver, in which an overall BER characteristic is improved. The transmitter (1) maps data, distributed among transmit antennas, onto an IQ plane to generate carrier symbols, and then, applies an inter-polarization interleave processing in a time direction to the carrier symbols between the transmit antennas, to generate OFDM signals. Receiving the OFDM signals, the receiver (2) demodulates the OFDM signals to generate complex baseband signals, and after that, applies a first deinterleave processing in a time direction to the complex baseband signals to generate time deinterleaved data. Further, the receiver (2) applies a MIMO separation processing to the time deinterleaved data to generate a plurality of sets of MIMO separated data and applies a second deinterleave processing between the receive antennas to the plurality of sets of MIMO separated data, so as to generate carrier symbols.Type: ApplicationFiled: February 9, 2016Publication date: February 8, 2018Applicants: NIPPON HOSO KYOKAI, NHK Engineering System, Inc.Inventors: Shingo ASAKURA, Madoka HONDA, Kenichi MURAYAMA, Takuya SHITOMI, Susumu SAITO, Yoshikazu NARIKIYO, Hiroaki MIYASAKA, Akihiko SATOU, Tomoaki TAKEUCHI, Kenichi TSUCHIDA, Masahiro OKANO, Masayuki TAKADA, Kazuhiko SHIBUYA
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Publication number: 20180034521Abstract: Disclosed is a MIMO system including a transmitter and a receiver, in which an overall BER characteristic is improved. The transmitter (1) maps data, distributed among transmit antennas, onto an IQ plane to generate carrier symbols, and then, applies an inter-polarization interleave processing in a time direction to the carrier symbols between the transmit antennas, to generate OFDM signals. Receiving the OFDM signals, the receiver (2) demodulates the OFDM signals to generate complex baseband signals, and after that, applies a first deinterleave processing in a time direction to the complex baseband signals to generate time deinterleaved data. Further, the receiver (2) applies a MIMO separation processing to the time deinterleaved data to generate a plurality of sets of MIMO separated data and applies a second deinterleave processing between the receive antennas to the plurality of sets of MIMO separated data, so as to generate carrier symbols.Type: ApplicationFiled: February 9, 2016Publication date: February 1, 2018Applicants: NIPPON HOSO KYOKAI, NHK Engineering System, Inc.Inventors: Shingo ASAKURA, Madoka HONDA, Kenichi MURAYAMA, Takuya SHITOMI, Susumu SAITO, Yoshikazu NARIKIYO, Hiroaki MIYASAKA, Akihiko SATOU, Tomoaki TAKEUCHI, Kenichi TSUCHIDA, Masahiro OKANO, Masayuki TAKADA, Kazuhiko SHIBUYA
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Publication number: 20150103944Abstract: A transmission apparatus configured to transmit four OFDM signals from four transmission antennas includes: a pilot signal insertion unit configured to generate four types of OFDM symbols by inserting pilot signals of different patterns into four types of transmission signals; and an OFDM signal generation unit configured to generate four OFDM signals by modulating respective carriers of the four types of OFDM symbols.Type: ApplicationFiled: October 11, 2013Publication date: April 16, 2015Applicant: NIPPON HOSO KYOKAIInventors: Takuya SHITOMI, Kenichi MURAYAMA, Makoto TAGUCHI, Shingo ASAKURA, Kazuhiko SHIBUYA
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Publication number: 20140321575Abstract: In a MIMO system performing MIMO transmission using a plurality of antennas, BER characteristics are improved. A transmission device includes a mapping unit that maps a transmission signal onto the IQ plane to generate carrier-modulated carrier symbols, a frequency/transmit antenna interleaving unit (frequency/polarized wave interleaving unit) that interleaves the carrier symbols in the frequency domain and between transmit antennas to generate interleaved data for each transmit antenna, and an output processing unit that constructs an OFDM frame for the interleaved data for each transmit antenna and transmits an OFDM signal via the transmit antennas.Type: ApplicationFiled: November 16, 2012Publication date: October 30, 2014Inventors: Shingo Asakura, Kenichi Murayama, Makoto Taguchi, Takuya Shitomi, Kazuhiko Shibuya
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Patent number: 6813321Abstract: A digital demodulator which will need no absolute phasing circuit is provided.Type: GrantFiled: July 21, 2000Date of Patent: November 2, 2004Assignee: Kabushiki Kaisha KenwoodInventors: Hisakazu Katoh, Akinori Hashimoto, Yuichi Iwadate, Kazuhiko Shibuya, Fumiaki Minematsu, Shigeyuki Itoh, Tomohiro Saito, Kenichi Shiraishi, Akihiro Horii, Shoji Matsuda, Soichi Shinjo
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Patent number: 6490010Abstract: Stabilized carrier recovery is achieved even at the time of a low C/N ratio by measuring the phase of a signal and controlling VCO or NCO (Numerical Controlled Oscillator) using only a period having few constellation points. At this time, false lock phenomenon is avoided as follows. That is, relatively short SYNC modulated by an already-known pattern is entered into a modulation wave, VCO or NCO oscillation frequency is swept in a wide range and sweep is stopped at a frequency in which the SYNC can be received, thereby carrying out coarse control AFC. Further, a period having long to some extent, having few constellation points is provided in the modulation wave and then, a difference between the frequency of a received modulated signal and a local oscillation signal of VCO or NCO is obtained in this period.Type: GrantFiled: May 14, 1999Date of Patent: December 3, 2002Inventors: Kazuhiko Shibuya, Junji Kumada, Yuichi Iwadate, Hiroyuki Hamazumi, Toshihiro Nomoto, Kouichi Takano, Tomohiro Saito, Shoji Tanaka, Fumiaki Minematsu, Akinori Hashimoto, Shigeyuki Itoh, Hajime Matsumura, Hisakazu Katoh, Masaru Takechi
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Patent number: 5561467Abstract: High resolution vertical and horizontal components of a high definition video signal are combined with a standard broadcast system video signal, such as the NTSC system, in which high frequency horizontal resolution components are sampled and used to modulate at least a first sub-carrier signal. The first sub-carrier is frequency interleaved onto the standard broadcast signal. Vertical high resolution components are time compressed and time division multiplexed onto top and bottom portions of the standard broadcast signal. The modified broadcast signal can be decoded by a standard receiver to display a standard resolution video image, while receivers designed to decode the modified signal can time division demultiplex the vertical high resolution components and demodulate the horizontal high resolution components, combine these components with the standard components, and generate a high definition video image.Type: GrantFiled: March 26, 1990Date of Patent: October 1, 1996Assignee: Nippon Hoso KyokaiInventors: Yoshio Takeuchi, Makoto Okui, Isao Kondo, Yasuaki Kanatsugu, Junji Kumada, Taiichiro Kurita, Kazuhiko Shibuya, Taiji Nishizawa, Yutaka Tanaka, Minoru Honda, Ryoichi Yajima, Shoichi Suzuki, Hisakazu Kato, Hiroyuki Hamazumi, Kazumasa Enami, Seiichi Gohshi, Yoshinori Izumi, Haruo Okuda, Ichiro Yuyama, Sumio Yano, Makoto Tadenuma
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Patent number: 5072297Abstract: A method and system for multiplexing additional audio information in the form of pulse code modulation (PCM) audio signals onto a television signal. The PCM audio signal is time multiplexed into scanning retrace intervals of the video signal. At a receiver, the bit error rate of the decoded PCM audio signal is compared with a threshold so as to switch the audio output from the PCM audio signal to a conventional FM demodulated audio signal when the bit error rate exceeds the predetermined threshold. In this way, the benefits of both PCM audio and FM audio can be obtained by utilizing the higher immunity of FM signals in low signal-to-noise ratio environments, while the high fidelity PCM audio signal is utilized when the signal-to-noise ratio environment is relatively high.Type: GrantFiled: March 27, 1990Date of Patent: December 10, 1991Assignee: Nippon Hoso KyokaiInventors: Masaru Kanazawa, Taiichiro Kurita, Kazuhiko Shibuya, Taiji Nishizawa, Yutaka Tanaka, Minoru Honda, Kazumasa Enami, Haruo Okuda, Hideki Suganami, Yoshiharu Hoshino, Toshiyuki Takegahara, Kaoru Watanabe
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Patent number: 5063445Abstract: A multiple sub-sampling encoding/decoding system performing interfield and interframe offset sub-sampling of a broad bandwidth television signal. The system compresses the television signal to fit, for example, to the transmission bandwidth of the standard television systems, compensates the transmission characteristics, and achieves the optimal frequency allocation of the modulated transmission signal.Type: GrantFiled: April 19, 1990Date of Patent: November 5, 1991Assignee: Nippon Hoso KyokaiInventors: Taiji Nishizawa, Yutaka Tanaka, Seiichi Gohshi, Junji Kumada, Yuichi Iwadate, Kazuhiko Shibuya, Toshihiko Susaki, Yukihiro Nishida, Minoru Honda, Taiichiro Kurita, Yoshinori Izumi, Makoto Okui, Isao Kondo, Ryoichi Yajima, Jun'ichi Ishida