Patents by Inventor Kazuo Kubo

Kazuo Kubo 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: 20170012726
    Abstract: An optical transmission apparatus that accommodates client signals in a line signal, includes: an OPUn mapper unit that receives and maps the client signals; and a mapping control unit that determines the number of pieces of client data to be mapped to a payload portion and determines the timing to insert client data and information on the number of pieces of client data into the payload portion to control mapping performed in the OPUn mapper unit.
    Type: Application
    Filed: January 13, 2015
    Publication date: January 12, 2017
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yoshiaki KONISHI, Kazuo KUBO
  • Publication number: 20160344580
    Abstract: A likelihood generation apparatus for acquiring a likelihood of a 16QAM signal includes a first likelihood generation unit configured to generate a likelihood of each of two bits of a 16QAM signal point of the 16QAM signal from a relationship of each of an I-axis component and a Q-axis component with a likelihood when the 16QAM signal point is mapped on a constellation diagram, and a second likelihood generation unit configured to generate a likelihood of each of remaining two bits other than the two bits of the 16QAM signal point of the 16QAM signal based on a position of the 16QAM signal point in a lookup table, which is configured to input the I-axis component and the Q-axis component of the 16QAM signal point as arguments, and includes regions acquired by dividing the constellation diagram based on a possible value of each of the bits.
    Type: Application
    Filed: February 16, 2015
    Publication date: November 24, 2016
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Yoshiaki KONISHI, Kenya SUGIHARA, Yoshikuni MIYATA, Hideo YOSHIDA, Kazuo KUBO
  • Patent number: 9356625
    Abstract: A frame generation method in an optical transmission system that transmits a transmission frame including a payload area for storing therein information data and an FEC redundant area for storing therein an error correcting code with respect to the information data is provided, in which coding gain is calculated based on the quality of a communication path through which the transmission frame is transmitted, and, when it is determined that redundancy is insufficient with an error correcting code stored in the FEC redundant area based on the coding gain, a variable parity area for storing therein the error correcting code is set in the payload area and a transmission frame in which the error correcting code is stored in the FEC redundant area and the variable parity area is generated.
    Type: Grant
    Filed: December 8, 2011
    Date of Patent: May 31, 2016
    Assignee: Mitsubishi Electric Corporation
    Inventor: Kazuo Kubo
  • Publication number: 20160087739
    Abstract: Provided is an optical communication cross-connection device for exchanging an OTN signal through optical communications, including: a plurality of OTN signal processing units (OTNsp units) for asynchronously conducting OTN signal processing; and a space switch connected between the plurality of OTNsp units, for conducting bidirectional signal exchange for the OTN signal, in which a first and a second OTNsp units that conduct signal transmission among the plurality of OTNsp units subject the OTN signal to skew processing on one side and deskew processing corresponding to the skew processing on another side between the first and second OTNsp units or between a communicating end-side one of the first and second OTNsp units and a communicating end-side OTNsp unit of an optical communication cross-connection device of a communication counterpart destination for the optical communication cross-connection device, and share a clock for the signal transmission therebetween.
    Type: Application
    Filed: June 18, 2013
    Publication date: March 24, 2016
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Soichiro KAMETANI, Kazuo KUBO, Kazuumi KOGUCHI, Yoshiaki KONISHI
  • Publication number: 20160006512
    Abstract: Provided is an optical transmission device for transmitting and receiving a multilevel-modulated optical signal, including: a plurality of transmission frame processors (212 to 214, 222 to 224) for generating transmission frame signals accommodating a plurality of client signals that are each subjected to error correction processing and scrambling/descrambling processing; and a digital modulator/demodulator (215) for mapping the transmission frame signals that are input to and output from the plurality of transmission frame processors to a multilevel signal and performing digital modulation/demodulation, in which the plurality of transmission frame processors each have a function of shifting a phase of a pattern between a plurality of transmission frames to be mapped to a multilevel signal and be digitally modulated/demodulated.
    Type: Application
    Filed: February 20, 2014
    Publication date: January 7, 2016
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Yoshiaki KONISHI, Kazuo KUBO
  • Patent number: 9148175
    Abstract: Provided is an error correction encoder that performs coding on both a transmission area and a redundancy area of the transmission frame by using a product code, and when excess or deficiency is arisen with respect to allocation of an information sequence area and/or a parity sequence area in a product code frame generated by the coding using the product code, non-uniformly allocate the information sequence area to the parity sequence area, and/or non-uniformly allocate the parity sequence area to the information sequence area, where each of the non-uniform allocations is performed in accordance with the arisen excess or deficiency.
    Type: Grant
    Filed: May 30, 2012
    Date of Patent: September 29, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yoshikuni Miyata, Wataru Matsumoto, Hideo Yoshida, Kazuo Kubo
  • Patent number: 9081677
    Abstract: An input bit error ratio estimating method executed by a communication control unit includes a computing, a condition determining, a first input BER estimating, a second input BER estimating, a third input BER estimating, and an input BER estimation result outputting. In the condition determining, the communication control unit determines which of a plurality of conditions set in advance to be narrowed down to one has been established, based on a post-internal decoding residual error detection ratio. Based on the condition that is determined in the condition determining as one that has been established, the communication control unit selects one out of a plurality of processing procedures for estimating the input BER, namely, selects one of the first input BER estimating to the third input BER estimating and executes the selected processing.
    Type: Grant
    Filed: February 20, 2012
    Date of Patent: July 14, 2015
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Yoshikuni Miyata, Kenya Sugihara, Kiyoshi Onohara, Kazuo Kubo, Hideo Yoshida, Takashi Mizuochi
  • Patent number: 8977927
    Abstract: An error-correction coding method that includes outer coding of performing a coding process for an outer code; and inner coding of performing a coding process for an inner code that has an error correction capability adjusted based on an error correction capability of the outer code.
    Type: Grant
    Filed: May 12, 2010
    Date of Patent: March 10, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yoshikuni Miyata, Hideo Yoshida, Kazuo Kubo, Takashi Mizuochi
  • Patent number: 8731398
    Abstract: An optical network system that performs transmission of N:1 protection includes a node that includes transmission-side operating muxponders that multiplex client signals for every M-channel signal bundle and convert multiplexed signals into optical signals having different wavelengths, transmission-side optical couplers that branch the client signals into two channels of operating and redundant, transmission-side optical switches each selecting one channel from redundant signals as a redundant client signal, and a transmission-side redundant muxponder that performs a predetermined transmission-side process according to an accommodation mode set on the redundant client signal and then multiplexes the redundant client signals, converts the multiplexed signal into an optical signal having a wavelength different from that of the operating signal, thereby making the accommodation mode settable for each channel in an independent manner.
    Type: Grant
    Filed: March 15, 2012
    Date of Patent: May 20, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yuji Akiyama, Kazuo Kubo, Sota Yoshida
  • Publication number: 20140122978
    Abstract: A frame generation method in an optical transmission system that transmits a transmission frame including a payload area for storing therein information data and an FEC redundant area for storing therein an error correcting code with respect to the information data is provided, in which coding gain is calculated based on the quality of a communication path through which the transmission frame is transmitted, and, when it is determined that redundancy is insufficient with an error correcting code stored in the FEC redundant area based on the coding gain, a variable parity area for storing therein the error correcting code is set in the payload area and a transmission frame in which the error correcting code is stored in the FEC redundant area and the variable parity area is generated.
    Type: Application
    Filed: December 8, 2011
    Publication date: May 1, 2014
    Applicant: Mitsubishi Electric Corporation
    Inventor: Kazuo Kubo
  • Patent number: 8693864
    Abstract: An optical network system includes a first node that converts input signals of n systems into optical signals having wavelengths different for each of the systems and wavelength-multiplexes and transmits the optical signals and a second node that selects signals of n systems from the wavelength-multiplexed signals and outputs the signals. The first node includes an optical coupler that divides the input signals into operating system signals and redundant signals, TPNDs that convert the operating systems into optical signals, an optical switch that selects standby system signals from the redundant signals, and a TPND that converts the standby system signals into optical signals in a storage mode corresponding to a type of the standby system signals.
    Type: Grant
    Filed: October 15, 2008
    Date of Patent: April 8, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kazuo Kubo, Takashi Mizuochi, Yuji Akiyama
  • Patent number: 8645806
    Abstract: An optical receiving apparatus includes: an A/D converting circuit; a received-signal demodulating circuit that demodulates a received digital signal from the A/D converting circuit into an m-bit received signal; a soft-decision-data generating circuit that generates n-bit (n?m) soft-decision data based on the m-bit received signal; and an error correcting circuit that performs error correction based on the n-bit soft-decision data and outputs an error-corrected received signal. The soft-decision-data generating circuit generates soft-decision data of n bits (n=p+1) that corresponds to a determination result according to 2n?1 soft-decision thresholds, by using an MSB of the m-bit received signal as hard-decision data, and by using, as reliability information, a result of comparison between a plurality of bits (k bits, where k?m) on an MSB side of the m-bit received signal and a fixed threshold, or p bits (p?m?k) selected from (m?k) bits on an LSB side of the m-bit received signal.
    Type: Grant
    Filed: May 7, 2010
    Date of Patent: February 4, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Takashi Sugihara, Takashi Mizuochi, Kazuo Kubo
  • Patent number: 8621316
    Abstract: An error correction encoding device includes an outer encoding circuit that performs encoding processing for an outer code and an inner encoding circuit that performs encoding processing for an inner code. The inner encoding circuit includes an inner-encoding input circuit that performs interleaving processing in which a parallel input sequence is divided into lanes and in which a barrel shift is performed for each inner frame in the lanes. Thus, allocation ratios between an information sequence area and a parity sequence area are made uniform.
    Type: Grant
    Filed: January 10, 2011
    Date of Patent: December 31, 2013
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yoshikuni Miyata, Hideo Yoshida, Kazuo Kubo, Takashi Mizuochi
  • Publication number: 20130311840
    Abstract: An input bit error ratio estimating method executed by a communication control unit includes a computing, a condition determining, a first input BER estimating, a second input BER estimating, a third input BER estimating, and an input BER estimation result outputting. In the condition determining, the communication control unit determines which of a plurality of conditions set in advance to be narrowed down to one has been established, based on a post-internal decoding residual error detection ratio. Based on the condition that is determined in the condition determining as one that has been established, the communication control unit selects one out of a plurality of processing procedures for estimating the input BER, namely, selects one of the first input BER estimating to the third input BER estimating and executes the selected processing.
    Type: Application
    Filed: February 20, 2012
    Publication date: November 21, 2013
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yoshikuni Miyata, Kenya Sugihara, Kiyoshi Onohara, Kazuo Kubo, Hideo Yoshida, Takashi Mizuochi
  • Publication number: 20130311847
    Abstract: Provided is an error correction encoder that performs coding on both a transmission area and a redundancy area of the transmission frame by using a product code, and when excess or deficiency is arisen with respect to allocation of an information sequence area and/or a parity sequence area in a product code frame generated by the coding using the product code, non-uniformly allocate the information sequence area to the parity sequence area, and/or non-uniformly allocate the parity sequence area to the information sequence area, where each of the non-uniform allocations is performed in accordance with the arisen excess or deficiency.
    Type: Application
    Filed: May 30, 2012
    Publication date: November 21, 2013
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yoshikuni Miyata, Wataru Matsumoto, Hideo Yoshida, Kazuo Kubo
  • Publication number: 20130225581
    Abstract: The present invention provides a nitrogen-containing aromatic heterocyclic derivative represented by formula (I): [wherein W represents CR3 (wherein R3 represents a hydrogen atom or the like) or the like, R4 represents a hydrogen atom or the like, R5 represents a hydrogen atom or the like, R9 represents substituted imidazolyl, R12 and R13 may be the same or different, each represent a hydrogen atom or the like, R22 and R23 may be the same or different, each represent a hydrogen atom or the like, R24 represents a hydrogen atom or the like, Y represents C—R25 (wherein R25 represents a hydrogen atom or the like) or the like] or a pharmaceutically acceptable salt thereof and a FGFR inhibitor comprising, as an active ingredient, the nitrogen-containing aromatic heterocyclic derivative or the pharmaceutically acceptable salt thereof, or the like.
    Type: Application
    Filed: July 15, 2011
    Publication date: August 29, 2013
    Applicant: KYOWA HAKKO KIRIN CO., LTD
    Inventors: Takayuki Furuta, Kazuo Kubo, Toshiyuki Atsumi, Maasa Yamanouchi
  • Patent number: 8495475
    Abstract: An FEC frame structuring device includes a multi-lane distributing unit that distributes a data frame to be transmitted to n lanes, FEC coding units each performs FEC coding of the distributed data frame independently for each of the n lanes to generate an FEC frame, a multiplexing unit that multiplexes the FEC frame from the FEC coding units by relating to m channels of an optical signal, a demultiplexing unit that demultiplexes the m channels of the received optical signal by relating to the n lanes, FEC decoding units each performs FEC decoding of the demultiplexed FEC frame independently for each of the n lanes, and a multi-lane synchronizing unit that synchronizes the n lanes with each other after the FEC decoding performed by the FEC decoding units to reconstruct the original data frame.
    Type: Grant
    Filed: April 26, 2010
    Date of Patent: July 23, 2013
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kazuo Kubo, Takashi Mizuochi, Takashi Sugihara
  • Patent number: 8442696
    Abstract: Setting safety function, as appropriate, according to a user environment is enabled, thereby enhancing safety function. According to selection information from a safety function selection unit 120, a function setting unit 116 sets arbitrary function among a plurality of functions as safety function pertaining to usage of a gas. When operating conditions for safety function are fulfilled, a monitoring unit 112 detects malfunction, which would arise during usage of a gas, and outputs a safety signal to a control unit 114 in accordance with the set safety function. In accordance with a safety signal from the monitoring unit 112, the control unit 114 cuts off a gas supply when an event fulfilling operating conditions for the set function has arisen. When an event fulfilling operating conditions for an unset function has arisen, a communication unit 124 reports occurrence of malfunction pertaining to unset function to the monitoring center 200.
    Type: Grant
    Filed: February 24, 2009
    Date of Patent: May 14, 2013
    Assignee: Panasonic Corporation
    Inventors: Mitsuo Yokohata, Hirozumi Nakamura, Tadanori Shirasawa, Kazuo Kubo, Mitsuo Namba, Hisashi Saito
  • Patent number: 8402339
    Abstract: An error correcting device in an optical communication system that transmits a transmission frame formed by adding an overhead and an error correction code to information data uses a concatenated code or an iterated code of at least two error correction codes as an outer code and an error correction code for soft-decision decoding as an inner code.
    Type: Grant
    Filed: April 22, 2010
    Date of Patent: March 19, 2013
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kazuo Kubo, Takashi Mizuochi, Hideo Yoshida, Yoshikuni Miyata
  • Publication number: 20120246537
    Abstract: Provided is an error correction method for an optical communication system that transmits a transmission frame formed of information data added with an overhead and an error correction code, the error correction method including adjusting a size of an FEC redundant area of an FEC frame for storing client signals of different signal types in accordance with the client signals so that transmission rates of the FEC frame for the respective client signals have an approximately N-multiple relationship (N is a positive natural number). With this, it is possible to obtain an error correction method and device capable of providing a high-quality and high-speed optical communication system without performance degradation caused by jitter or the like and with the common use of circuits having a reduced circuit scale.
    Type: Application
    Filed: November 19, 2010
    Publication date: September 27, 2012
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Kazuo Kubo, Takashi Mizuochi