Patents by Inventor Takahiko Kishi

Takahiko Kishi 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: 20200029852
    Abstract: In order to stably detect biological information such as the heartbeat, respiration, and pulse waves of a living organism, a biological information detection system that detects biological information comprises: a transmission antenna arranged on one side of the living organism and irradiating radio waves of prescribed polarized waves on to the living organism; a reception antenna arranged on the other side of the living organism and receiving transmitted waves being polarized waves orthogonal to the radio waves of prescribed polarized waves in a step in which same are transmitted through the living organism; and a detection unit that detects biological information on the basis of the transmitted waves received by the reception antenna.
    Type: Application
    Filed: January 10, 2018
    Publication date: January 30, 2020
    Inventors: Yusuke SAKAI, Takahiko KISHI
  • Patent number: 8768285
    Abstract: A wireless device includes a baseband unit and front-end units that are provided in individual housings. The baseband unit and the front-end units are connected to each other by wire. A transmitter for synchronization that converts a signal based on a reference clock into a radio signal and transmits the radio signal as a clock synchronization signal is provided in any one of the housings, and receivers for synchronization that receive the signal for the clock synchronization and PLLs that generate a clock synchronized with a reference clock signal which is obtained from the received clock synchronization signal are provided in the housings other than the housing having the transmitter provided therein. In order to simultaneously process a plurality of wireless devices having different symbol rates, it is preferable to provide the transmitter, the receiver, and the PLL for each reference clock.
    Type: Grant
    Filed: March 23, 2010
    Date of Patent: July 1, 2014
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Takahiko Kishi, Hiroki Okada
  • Patent number: 8597196
    Abstract: A cardiac signal processing apparatus includes: a unit for acquiring, from a heartbeat sensor, cardiac signals relating to heartbeats of a subject; a low-pass filter for allowing passage of those cardiac signals having a first predetermined frequency or lower, among the cardiac signals; higher harmonic noise acquisition unit for acquiring harmonic signals of low-frequency noise by performing high frequency extrapolation on the signals output from the low-pass filter; a high-pass filter for allowing passage of those cardiac signals having a second predetermined frequency or higher, among the cardiac signals; and higher harmonic noise removal unit for removing the harmonic signals of low-frequency noise from the signals output from the high-pass filter. It is thus made possible to remove noise from the cardiac signals and to obtain desirable heartbeat detection characteristics.
    Type: Grant
    Filed: December 28, 2012
    Date of Patent: December 3, 2013
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Takahiko Kishi, Jun-ichi Takada, Satoshi Suzuki, Tomoyoshi Yasue
  • Publication number: 20130197377
    Abstract: A cardiac signal processing apparatus includes: a unit for acquiring, from a heartbeat sensor, cardiac signals relating to heartbeats of a subject; a low-pass filter for allowing passage of those cardiac signals having a first predetermined frequency or lower, among the cardiac signals; higher harmonic noise acquisition unit for acquiring harmonic signals of low-frequency noise by performing high frequency extrapolation on the signals output from the low-pass filter; a high-pass filter for allowing passage of those cardiac signals having a second predetermined frequency or higher, among the cardiac signals; and higher harmonic noise removal unit for removing the harmonic signals of low-frequency noise from the signals output from the high-pass filter. It is thus made possible to remove noise from the cardiac signals and to obtain desirable heartbeat detection characteristics.
    Type: Application
    Filed: December 28, 2012
    Publication date: August 1, 2013
    Inventors: Takahiko KISHI, Jun-ichi TAKADA, Satoshi SUZUKI, Tomoyoshi YASUE
  • Publication number: 20130094490
    Abstract: A wireless communication apparatus has a first communication unit configured to perform at least one of transmission and reception by using a multicarrier signal constituted by a plurality of subcarriers shaped by a band-limited pulse waveform; and second communication unit configured to perform at least one of transmission and reception by using a signal having a different modulation format or modulation constant from said signal of said first communication unit. Said first communication unit configured to perform communication without using at least one of said plurality of subcarriers, and said second communication unit configured to perform communication using a band of said subcarrier not used by said first communication unit.
    Type: Application
    Filed: August 20, 2012
    Publication date: April 18, 2013
    Applicants: TOYOTA INFOTECHNOLOGY CENTER CO., LTD., FUKUOKA UNIVERSITY, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Makoto TAROMARU, Takahiko KISHI, Eiji NIWA
  • Publication number: 20100248644
    Abstract: A wireless device includes a baseband unit and front-end units that are provided in individual housings. The baseband unit and the front-end units are connected to each other by wire. A transmitter for synchronization that converts a signal based on a reference clock into a radio signal and transmits the radio signal as a clock synchronization signal is provided in any one of the housings, and receivers for synchronization that receive the signal for the clock synchronization and PLLs that generate a clock synchronized with a reference clock signal which is obtained from the received clock synchronization signal are provided in the housings other than the housing having the transmitter provided therein. In order to simultaneously process a plurality of wireless devices having different symbol rates, it is preferable to provide the transmitter, the receiver, and the PLL for each reference clock.
    Type: Application
    Filed: March 23, 2010
    Publication date: September 30, 2010
    Applicants: TOYOTA INFOTECHNOLOGY CENTER CO., LTD., TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Takahiko KISHI, Hiroki OKADA
  • Patent number: 7602836
    Abstract: Disclosed is a receiver for achieving optimum power consumption and optimum reception performance according to use, purpose, and required performance. A control circuit calculates an evaluation value H relating to a detection method and a reception state of a received signal. When a delay detection is selected depending on the evaluation value H, a delay detection circuit and a judgment circuit operate, and a selection circuit selects and outputs an output signal of the judgment circuit. When a semi-synchronous detection is selected depending on the evaluation value H, the semi-synchronous detection circuit, the signal judgment unit and the differential decoder operate, and the selection circuit selects and outputs an output signal of the differential decoder. When a dynamic controlled detection is selected depending on the evaluation value H, the delay detection and the semi-synchronous detection are controlled to be dynamically changed.
    Type: Grant
    Filed: December 1, 2004
    Date of Patent: October 13, 2009
    Assignee: Samsung Electronics Co., Ltd
    Inventor: Takahiko Kishi
  • Patent number: 7583943
    Abstract: An automatic gain control device capable of reducing signal saturation or signal distortion caused by out-of-band signals of a filter or delay of a control signal. An AGC response control section compares a level of control voltage (‘V2_I terminal’ signal) output from an AGC control section b with a level of control voltage (‘V3_I terminal’ signal) output from an AGC control section c. If the ‘V3_I terminal’ signal is below the ‘V2_I terminal’ signal, an AGC amplifier is controlled by the ‘V3_I terminal’ signal. If the ‘V3_I terminal’ signal is above the ‘V2_I terminal’ signal, the AGC amplifier is controlled by the ‘V2_I terminal’ signal. In the latter case, control information of the AGC control section b is replaced by control information of the AGC control section c so that the AGC control section c controls the AGC amplifier c.
    Type: Grant
    Filed: June 28, 2005
    Date of Patent: September 1, 2009
    Assignee: Samsung Electronics Co., Ltd
    Inventor: Takahiko Kishi
  • Patent number: 7515647
    Abstract: A digital frequency converter is provided that maintains a high power efficiency in an EER scheme despite the inclusion of digital signal processing. An inputted modulated signal is converted into phase information and amplitude information of a polar coordinate type. The amplitude information is outputted as amplitude information of the digital frequency converter. Meanwhile, phase change of a frequency f2, which is outputted from an accumulator, corresponding to lower ‘Q’ figures of phase data PD for frequency conversion is added to the phase information by an adder. In addition, a sampling frequency of the phase information outputted from the adder is upsampled by an interpolator, and also, phase change of a frequency f3, is converted into a phase-modulated signal of an orthogonal coordinate type, and then outputted as phase information of the digital frequency converter.
    Type: Grant
    Filed: November 24, 2004
    Date of Patent: April 7, 2009
    Assignee: Samsung Electronics Co., Ltd
    Inventor: Takahiko Kishi
  • Patent number: 7319724
    Abstract: Disclosed is radio equipment for transmission and reception of Frequency Division Duplex mode signals and transmission signal characteristic compensation utilizing small-scaled circuit construction. A receiver converts Radio Frequency band signals from an antenna sharer to an Intermediate Frequency (IF) via a mixer and into digital signals utilizing an Analog-to Digital Converter. Reception signals and image signals of transmission signals, both having an IF A are contained in the converted signals, are converted into reception signals having an IF B and image signals having an IF C, respectively, which both have positive and negative carrier frequencies symmetrical to a zero frequency direct current component and are represented as a complex number. A transmitter converts the IF C into a baseband of image signals, and compensates signal characteristics relative to complex baseband signals of quantized transmission signals at a characteristic compensator using converted signals as reference signals.
    Type: Grant
    Filed: July 31, 2003
    Date of Patent: January 15, 2008
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Takahiko Kishi
  • Patent number: 7308240
    Abstract: A numerical control oscillator (NCO) for reducing a circuit size and power consumption while maintaining a desired frequency deviation, and suppressing generation of a spurious as much as possible. The NCO comprises a phase accumulator for accumulating input phase difference data to generate phase data, and a read only memory (ROM) for storing a phase/amplitude conversion table to output amplitude data corresponding to the phase data generated by the phase accumulator. The phase accumulator includes a phase register and a phase calculator. If a sampling frequency of an output signal from the NCO is Fs, the upper limit of a desired frequency setting interval of the output signal is FD and K and L are arbitrary integers, the phase calculator adds or subtracts the input phase difference data and phase data from the phase register to or from each other by a modulo operation taking the nearest integer of M as a modulus, where M=Fs/FD×K/L.
    Type: Grant
    Filed: December 11, 2003
    Date of Patent: December 11, 2007
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Takahiko Kishi
  • Patent number: 7254129
    Abstract: Disclosed are a wireless phone and a wireless communication method wherein communication quality estimation is made for both circuit switching and packet communication modes and sound of both the modes is interpolated mutually so as to improve the sound quality. The switching between first and second sound signals is performed at intervals of a speech pitch period based on quality information of first and second sound signals, where the first and second signals are received and decoded, respectively, through a first wireless communication in circuit switching mode and a second wireless communication in packet communication mode. A delay control signal is outputted to compensate for the time difference between the first and second sound signals, based on the quality information of the two sound signals, and the time difference is compensated for based on the delay control signal.
    Type: Grant
    Filed: September 10, 2003
    Date of Patent: August 7, 2007
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Takahiko Kishi
  • Publication number: 20070171312
    Abstract: A BPF outputs a real RF signal by suppressing a band out of an RF signal frequency band in a received signal. A local oscillator outputs a complex local signal with a predetermined frequency. A half-complex mixer performs frequency conversion by multiplying the real RF signal by a real part of the local signal, performs frequency conversion by multiplying the real RF signal by an imaginary part of the local signal, and outputs a complex signal separated by the predetermined frequency from a frequency of the real RF signal. A complex-coefficient SAW filter performs a convolution integral on an impulse response generated by an even function for a real part of the complex signal, performs a convolution integral on an impulse response generated by an odd function for an imaginary part of the complex signal, and outputs a real signal by suppressing one side of a positive or negative frequency.
    Type: Application
    Filed: December 20, 2006
    Publication date: July 26, 2007
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventor: Takahiko Kishi
  • Patent number: 7227911
    Abstract: A multichannel receiver for effectively receiving multichannel signals at the same time without any restrictions in the symbol timing and channel interval of modulated signals. A quadrature detector of the multichannel receiver includes first and second multipliers. The first multiplier multiplies a received signal by a real number axis signal generated from a quadrature carrier oscillator. The second multiplier multiplies a received signal by an imaginary number axis signal. The quadrature detector converts a carrier of a center signal of odd signals into a DC component of zero frequency, and converts the center signal into a complex baseband signal, and at the same time converts carrier signals other than the center carrier signal into a complex IF signal symmetrical to the DC component of zero frequency. ADCs (Analog-to-Digital Converters) convert the complex IF signals into complex IF digital signals.
    Type: Grant
    Filed: May 8, 2003
    Date of Patent: June 5, 2007
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Takahiko Kishi
  • Patent number: 7203473
    Abstract: Radio equipment including a characteristic compensator for compensating for an orthogonality error of a mixer with low consumption power is disclosed. In radio equipment, an orthogonal detector converts a received real signal into a complex reception signal of an intermediate frequency. Further, when a complex reception signal converted into a digital signal by A/D converters includes a desired signal (quasi-desired signal), which includes an image signal of a non-desired signal, and a non-desired signal (preparatory desired signal), which includes an image signal of a desired signal, a frequency of the quasi-desired signal is frequency-converted to a signal closer to a direct current component by a frequency converter and a frequency of the preparatory desired signal is frequency-converted to a signal closer to a direct current component by a frequency converter. A decimator respectively performs a filtering and a down-sampling on the frequency-converted quasi-desired signal and preparatory desired signal.
    Type: Grant
    Filed: July 30, 2003
    Date of Patent: April 10, 2007
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Takahiko Kishi
  • Publication number: 20060281429
    Abstract: A downconverter and upconverter are provided which can obtain a satisfactory image rejection ratio in a low-Intermediate Frequency (IF) scheme while reducing power consumption, and can improve Error Vector Magnitude (EVM) in a zero-IF scheme. A complex-coefficient transversal filter rejects one side of a positive or negative frequency, and converts a Radio Frequency (RF) signal to a complex RF signal configured by real and imaginary parts. A local oscillator outputs a complex local signal in which a set frequency is set as a center frequency. A full-complex mixer, connected to the complex-coefficient transversal filter and the local oscillator, perform a frequency conversion process by multiplying a complex signal output from the complex-coefficient transversal filter and the complex local signal output from the local oscillator, and outputs a complex signal of a frequency separated by the set frequency from a frequency of the RF signal.
    Type: Application
    Filed: April 28, 2006
    Publication date: December 14, 2006
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Takahiko Kishi, Takahiro Sato
  • Patent number: 7113758
    Abstract: Disclosed is an automatic gain controller capable of reducing signal saturation or signal distortion caused by out-of-band signals of a filter extracting an object signal or delay of a control signal and capable of precisely measuring a signal level in a filter band. An AGC response control section compares a level of control voltage (“V2_I terminal” signal) outputted from a first AGC control section and inputted into a “V2_I terminal” with a level of control voltage (“V3_I terminal” signal) outputted from a second AGC control section and inputted into a “V3_I terminal”. If the control voltage, which is the “V3_I terminal” signal, outputted from the second AGC control section is less than the control voltage, which is a “V2_I terminal” signal, outputted from the first AGC control section, the AGC response control section controls an AGC amplifier by using the control voltage outputted from the second AGC control section.
    Type: Grant
    Filed: March 8, 2004
    Date of Patent: September 26, 2006
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Takahiko Kishi
  • Patent number: 7047264
    Abstract: Disclosed is a frequency converter with an excellent frequency characteristic, having a minimized number of multipliers. A digital down-converter includes a decimator/mixer, an interpolator and a channel filter. The decimator/mixer performs quadrature conversion from a real signal to complex signals, frequency conversion by a frequency K?, and 1/(M×I)-fold decimation on a signal obtained by sampling an RF/IF signal S(i) by an A/D converter. The interpolator is comprised of I-fold up-samplers and lowpass filters, and performs I-fold interpolation on the outputs from the decimator/mixer. The channel filter is comprised of lowpass filters having a band characteristic given to a communication channel, and outputs band-rejected baseband signals i(j) and q(j) by filtering the outputs of the interpolator.
    Type: Grant
    Filed: March 4, 2002
    Date of Patent: May 16, 2006
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Takahiko Kishi
  • Patent number: 6958782
    Abstract: There is provided a frequency converter for suppressing generation of an image signal using a simple adaptive algorithm. In the frequency converter, an orthogonal converter 21 converts an RF/IF signal to a complex signal along with frequency conversion and ADCs quantize the complex signal. An image signal canceller achieves the complex conjugate of the quantized complex signal by inverting the imaginary part of the quantized signal through a multiplier. An LMS core adaptively processes the complex signal using the complex conjugate signal as a reference signal and the output of the image signal canceller as an error signal. The resulting cancellation signals are level-matched in attenuators. Subtracters combine the complex signal with the level-adjusted complex conjugate signal.
    Type: Grant
    Filed: January 29, 2002
    Date of Patent: October 25, 2005
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Takahiko Kishi
  • Publication number: 20050117662
    Abstract: A digital frequency converter is provided that maintains a high power efficiency in an EER scheme despite the inclusion of digital signal processing. An inputted modulated signal is converted into phase information and amplitude information of a polar coordinate type. The amplitude information is outputted as amplitude information of the digital frequency converter. Meanwhile, phase change of a frequency f2, which is outputted from an accumulator, corresponding to lower ‘Q’ figures of phase data PD for frequency conversion is added to the phase information by an adder. In addition, a sampling frequency of the phase information outputted from the adder is upsampled by an interpolator, and also, phase change of a frequency f3, is converted into a phase-modulated signal of an orthogonal coordinate type, and then outputted as phase information of the digital frequency converter.
    Type: Application
    Filed: November 24, 2004
    Publication date: June 2, 2005
    Applicant: SAMSUNG ELECTRONICS CO., LTD
    Inventor: Takahiko Kishi