Tomisawa
Fumihiro Tomisawa, Kawasaki JP
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20100289585 | AMPLIFIER, TRANSMITTER, AND METHOD FOR COMPENSATING GAIN - An amplifier includes a voltage detector that detects current flowing to a drain terminal of a transistor which amplifies a signal using GaN as a voltage difference by means of voltage conversion, a compensation decision unit that decides whether or not to perform gain compensation based on the voltage difference detected by the voltage detector, and a gain compensation unit that performs the gain compensation according to the voltage difference when the compensation decision unit decides to perform the gain compensation. | 11-18-2010 |
Jun Tomisawa, Chiyoda-Ku JP
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20150248966 | SIGNAL TRANSMITTING CIRCUIT - A transmitter circuit feeds to a transmitter coil, every time transmission data changes in logical value, a current signal in pulse form having a positive or negative polarity that is alternately inverted in response to each change in logical value; and a receiver circuit inputs induction voltage signals each being double pulses having both positive and negative polarities, which have been induced in a receiver coil by the current signal fed to the transmitter coil, to demodulate the transmission data. The receiver circuit includes: an amplifier that amplifies the induction voltage signals of double pulses induced in the receiver coil; and a signal generating unit that, when detecting first single pulses in the induction voltage signals of double pulses amplified by the amplifier, sets up an insensitive period for second single pulses therein, to generate an output signal corresponding to the transmission data, based solely on the first single pulses. | 09-03-2015 |
Masayuki Tomisawa, Singapore SG
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20090074050 | METHOD AND APPARATUS FOR RECEIVING CODED SIGNALS WITH THE AID OF CHANNEL STATE INFORMATION - Method and apparatus for receiving coded signals with the aid of CSI are provided. The method comprises: performing channel estimation to obtain a CFR estimation vector; computing a squared magnitude of the CFR estimation vector, and obtaining a normalization factor α by averaging the squared magnitudes of CFR estimations on all N subcarriers; finding a norm-shift operand m satisfying the condition that α | 03-19-2009 |
20090279421 | APPARATUS AND METHODS FOR ESTIMATING AND COMPENSATING SAMPLING CLOCK OFFSET - An apparatus for sampling clock recovery (SCO) and methods for estimating and compensating SCO are provided. The apparatus comprises a symbol timing adjustment module for shifting forward or backward symbol timing of the transmitted OFDM symbols; a discrete Fourier transform (DFT) processor for performing DFT to an output from the symbol timing adjustment module; a channel estimator for undertaking a channel frequency response estimation based on a channel estimation sequence; a SCO phase rotator for receiving and performing phase shift on the transmitted OFDM symbols of a frame header and a frame payload; an SCO estimation stage for undertaking an SCO estimation based on a pilot-subcarrier-related output of the SCO phase rotator and the CFR estimation; and an SCO compensation distributor for dividing the SCO estimation into integer and fractional portions and then distributing them into the symbol timing adjustment module and the SCO phase rotator, respectively. | 11-12-2009 |
20110122979 | Apparatus and methods for estimating and compensating sampling clock offset - An apparatus for sampling clock recovery (SCO) and methods for estimating and compensating SCO are provided. The apparatus comprises a symbol timing adjustment module for shifting forward or backward symbol timing of the transmitted OFDM symbols; a discrete Fourier transform (DFT) processor for performing DFT to an output from the symbol timing adjustment module; a channel estimator for undertaking a channel frequency response estimation based on a channel estimation sequence; a SCO phase rotator for receiving and performing phase shift on the transmitted OFDM symbols of a frame header and a frame payload; an SCO estimation stage for undertaking an SCO estimation based on a pilot-subcarrier-related output of the SCO phase rotator and the CFR estimation; and an SCO compensation distributor for dividing the SCO estimation into integer and fractional portions and then distributing them into the symbol timing adjustment module and the SCO phase rotator, respectively. | 05-26-2011 |
Masayuki Tomisawa US
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20090268782 | CFR ESTIMATION METHOD FOR MULTI-BAND OFDM-BASED UWB SYSTEMS - A multi-stage CFR estimation method for multi-band OFDM-based UWB systems is provided. The method comprises obtaining a CFR estimation ĥ | 10-29-2009 |
Miki Tomisawa, Utsunomiya-Shi JP
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20140080599 | INFORMATION STORAGE MEDIUM, GAME DEVICE, AND SERVER - Input information that selects one card among five cards that are arranged in one direction in a predetermined area of a game screen is received, and a player character is caused to make a motion corresponding to the selected card. When three cards to which an identical attribute is assigned are adjacently disposed in the predetermined area, the three cards are replaced with one card to which the same attribute as that of the three cards is assigned, but which differs in type from the three cards, the card positioned in the rightward direction relative to the replaced cards is shifted in the leftward direction, and an additional two cards are disposed in the space formed by shifting the card. | 03-20-2014 |
Satoru Tomisawa, Kawasaki-Shi JP
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20130107918 | HIGH-FREQUENCY SIGNAL PROCESSOR AND WIRELESS COMMUNICATION SYSTEM | 05-02-2013 |
20150180529 | HIGH-FREQUENCY SIGNAL PROCESSOR AND WIRELESS COMMUNICATION SYSTEM - There is a need to reduce secondary intermodulation distortion that may occur in a reception circuit of a high-frequency signal processor and a wireless communication system having the same. In test mode, for example, a test signal generating circuit TSGEN generates a test signal RFtst at f_tx±0.5 MHz. The test signal RFtst is input to a mixer circuit MIXrx_I (MIXrx_Q). A correction circuit block CALBK detects an IM2 component resulting from the MIXrx_I (MIXrx_Q). The CALBK varies a differential balance for the MIXrx_I (MIXrx_Q) and concurrently monitors a phase for the IM2 component resulting from MIXrx_I (MIXrx_Q). The CALBK searches for the differential balance corresponding to a transition point that allows the phase to transition by approximately 180°. The MIXrx_I (MIXrx_Q) operates in normal mode using the differential balance as a search result. | 06-25-2015 |
Shigeki Tomisawa, Yokohama-Shi JP
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20100156918 | PROGRAM, INFORMATION STORAGE MEDIUM, IMAGE GENERATION SYSTEM, AND IMAGE GENERATION METHOD FOR GENERATING AN IMAGE FOR OVERDRIVING THE DISPLAY DEVICE - An image generation system including: a drawing section which draws an object to generate image data; and an overdrive effect processing section which performs overdrive effect processing for the generated image data and generates image data to be output to a display section. The overdrive effect processing section performs the overdrive effect processing based on differential image data between image data generated in a Kth frame and image data generated in a Jth frame (K>J). | 06-24-2010 |
Toshiaki Tomisawa, Tokyo JP
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20090264128 | TERMINAL STATION, BASE STATION, RADIO COMMUNICATION SYSTEM, AND COMMUNICATION CONTROL METHOD - An uplink quality information collecting unit transmits, when there is no uplink data transmission from a terminal station for a predetermined time, dummy data to a base station that is currently connected to the terminal station, and collects uplink-quality information that is generated by transmitting the dummy data to the base station. A handover determining unit determines whether to perform a handover based on the uplink-quality information collected by the uplink quality information collecting unit. | 10-22-2009 |
20100046471 | COMMUNICATION SYSTEM, COMMUNICATION APPARATUS, WIRELESS BASE STATION, AND WIRELESS TERMINAL STATION - A downlink data frame addressed to a terminal is copied and obtained downlink data frames are transmitted through different APs, respectively. When a plurality of same uplink data frames are received through the different APs, any one uplink data frame selected out of the uplink data frames is transmitted to its destination. An uplink data frame received from the terminal is copied and obtained uplink data frames are transmitted through different STAs, respectively. When a plurality of same downlink data frames are received through different STAs, any one downlink data frame selected out of the downlink data frames is transmitted to the terminal. | 02-25-2010 |