Patents by Inventor Takeshi Toda

Takeshi Toda 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: 20040192394
    Abstract: A method of controlling an array antenna part having a plurality of antenna elements arranged at a predetermined interval, includes the steps of obtaining a predetermined evaluation function with respect to each of weighting coefficients to be applied to incoming signals arriving at a predetermined number of antenna elements, by perturbing each of the weighting coefficients at a sampling interval which is within one symbol time, and adjusting each of the weighting coefficients based on the evaluation function.
    Type: Application
    Filed: January 14, 2004
    Publication date: September 30, 2004
    Inventors: Yuuta Nakaya, Takeshi Toda, Yasuyuki Oishi
  • Publication number: 20040139897
    Abstract: A communications apparatus using an adaptive antenna having in a high frequency unit an antenna unit including a plurality of antenna elements and a plurality of adjustment units, provided corresponding to the plurality of antenna elements, for adjusting directivity of an entire antenna, comprising:
    Type: Application
    Filed: January 9, 2004
    Publication date: July 22, 2004
    Inventors: Yuta Nakaya, Takeshi Toda, Yasuyuki Oishi, Shinsuke Hara
  • Publication number: 20040140929
    Abstract: An adaptive array antenna controller is disclosed that adaptively controls weighting coefficients of multiple antenna elements of an array antenna based on a digital signal outputted from an analog-to-digital converter receiving a weighted analog signal received from the array antenna. The controller includes an impulse response measuring device for obtaining impulse responses, based on correlation calculation of the digital signal and a known signal having a predetermined pattern; an impulse response generator for extracting path components existing within a predetermined time duration from among plural path components included in the impulse responses and generating desired impulse responses; a reference signal generator for forming a reference signal having a desired pattern, based on convolution calculation of the desired impulse responses and the known signal; and an adaptive controller for adjusting the weighting coefficients, based on the digital signal and the reference signal.
    Type: Application
    Filed: December 24, 2003
    Publication date: July 22, 2004
    Inventors: Takeshi Toda, Yuuta Nakaya
  • Publication number: 20040135723
    Abstract: An adaptive array antenna controller is disclosed that adaptively controls weighting coefficients of multiple antenna elements of an array antenna based on a digital signal outputted from an analog-to-digital converter receiving a weighted analog received signal from the array antenna. The controller includes an extractor for extracting a signal component for each sub-carrier contained in the analog received signal by Fourier transforming the digital signal. The controller adjusts the weighting coefficients so as to suppress a predetermined sub-carrier among plural sub-carriers.
    Type: Application
    Filed: December 23, 2003
    Publication date: July 15, 2004
    Inventors: Yuuta Nakaya, Takeshi Toda
  • Publication number: 20040043794
    Abstract: The invention relates to a radio communication apparatus of a base station or a mobile station in a mobile communication system. A radio communication apparatus of the invention has: a channel quality monitoring section for monitoring channel quality of each arriving wave received in parallel via a plurality of array antennas; a computing section for calculating, for elements of each of the array antennas, a set of weights that are such values as to allow each array antenna to function as an adaptive beam forming array antenna; a weight setting section for applying, in common to the array antennas, a particular set of weights which are applied to an array antenna having received an arriving wave with maximum channel quality; and a combining section for combining the arriving waves received with the array antennas to which the particular set of weights are applied.
    Type: Application
    Filed: August 27, 2003
    Publication date: March 4, 2004
    Inventors: Yuuta Nakaya, Takeshi Toda
  • Publication number: 20040036651
    Abstract: An adaptive antenna unit includes feeding antenna elements arranged so as to reduce spatial correlations thereof, parasitic antenna elements, provided with respect to each of the feeding antenna elements and arranged so as to increase mutual coupling between a corresponding one of the feeding antenna elements, variable reactance elements each terminating a corresponding one of the parasitic antenna elements, and a control section. The control section controls reactances of the reactance elements and controls weighting of the reception signals received by the feeding antenna elements, in response to the reception signals.
    Type: Application
    Filed: June 4, 2003
    Publication date: February 26, 2004
    Inventor: Takeshi Toda
  • Publication number: 20030232633
    Abstract: An adaptive antenna unit is adapted to a mobile terminal for making mobile communication and adaptively forms an antenna directivity in a direction of a base station which exchanges signals with the mobile terminal. The adaptive antenna unit is provided with an azimuth sensor to detect at least one of rotation, inclination and present position of the mobile terminal, a transmitter-receiver section to control the antenna directivity in a direction in which a reception characteristic improves based on reception signals received from a plurality of antenna elements forming the antenna directivity, and a mechanism for correcting the antenna directivity in the direction of the base station, based on the at least one of rotation, inclination and present position of the mobile terminal detected by the azimuth sensor.
    Type: Application
    Filed: June 4, 2003
    Publication date: December 18, 2003
    Inventors: Atsuo Iida, Takeshi Toda
  • Patent number: 6614766
    Abstract: An interference canceller includes despread processing parts, a combiner combining interference replica generation signals, a decision part that decides an output signal, spread processing parts coupled to the despread processing parts and the decision part, an attenuation coefficient generator generating an attenuation coefficient dependent on a reliability of the interference replica generation signals, and a multiplier multiplying the output signal of the decision part by the attenuation coefficient.
    Type: Grant
    Filed: December 4, 1998
    Date of Patent: September 2, 2003
    Assignee: Fujitsu Limited
    Inventors: Hiroyuki Seki, Yoshinori Tanaka, Shuji Kobayakawa, Takeshi Toda
  • Patent number: 6582181
    Abstract: A lift-up mechanism (50, 150) installed inside a vehicle serves to move a seat unit (10, 110) into or out of the vehicle. The seat unit (10, 110) is used as a passenger seat inside the vehicle and as a wheelchair outside the vehicle. Connecting plates (56, 156) are disposed on the lift-up mechanism (50, 150) permit the lift-up mechanism (50, 150) to be connected to the seat unit (10, 110) by inserting the connecting plates into connecting recesses (40, 140) formed in the seat unit (10, 110). Front wheels (60, 160) and rear wheels (70, 170) of the seat unit (10, 110) can be retracted and extended. A drive unit having an electric motor or similar drive may be provided to retract and extend the front wheels (60, 160) and the rear wheels (70, 170). An attitude changing arrangement may be provided to automatically change the attitude of the front wheels (60, 160) when the front wheels (60, 160) and the rear wheels (70, 170) are retracted.
    Type: Grant
    Filed: March 19, 2002
    Date of Patent: June 24, 2003
    Assignees: Toyota Shatai Kabushiki Kaisha, Kabushiki Kaisha Matsunaga Seisakusho
    Inventors: Yoshiro Suehiro, Masamitsu Iwatani, Takafumi Hijikata, Kenji Murabayashi, Mineki Ninomiya, Yoshiyuki Miura, Tomoyuki Kuroda, Takeshi Toda, Shigeyuki Matsunaga
  • Patent number: 6513000
    Abstract: A heat capacity C1 is obtained by conducting two-dimensional thermal analysis simulation to the cross-section of a wiring. Next, based on one-dimensional approximate equation of &thgr;0=(Q0/2) (&lgr;·SC1)−½ along a wiring length direction, a wiring temperature rise &thgr;0 in the void is obtained. In the expression, &thgr;0 is a rise in wiring temperature in the void, Q0 is a thermal quantity of the void in the wiring, &lgr; is a heat conductivity of the wiring and S is a cross-sectional area of the wiring. The heat capacity C1 may be obtained from an expression C1=&lgr;′{(w/t)+(2.80/1.15) (h/t)0.222}. In the expression, W is wiring width, h is wiring thickness, t is substrate film thickness and &lgr;′ is the heat conductivity of the substrate film. By so obtaining, it is possible to shorten analysis time, to save the capacity of a memory and that of a disk for use in calculation, to obtain a simpler analysis model and to facilitate creating a mesh.
    Type: Grant
    Filed: March 10, 1999
    Date of Patent: January 28, 2003
    Assignee: NEC Corporation
    Inventor: Takeshi Toda
  • Patent number: 6503800
    Abstract: The present invention provides a manufacturing method of a semiconductor device having a single semiconductor substrate, for forming a first processing circuit portion and a second processing circuit portion having mutually different thicknesses of gate oxide films on the single semiconductor substrate including the steps of: forming a first gate oxide film over the semiconductor substrate; sequentially forming an insulating film and a first conducting layer over the entire surface of the first gate oxide film; eliminating those portions ranging from the first gate oxide film to the first conducting layer, which portions are included within an element forming region of the first processing circuit portion; and forming, only in the element forming region of the first processing circuit portion, a second gate oxide film having a thickness different from that of the first gate oxide film.
    Type: Grant
    Filed: June 15, 2001
    Date of Patent: January 7, 2003
    Assignee: NEC Corporation
    Inventors: Takeshi Toda, Yoshiro Goto
  • Patent number: 6473451
    Abstract: The invention provides a technique for measurement of a signal to interference power ratio wherein an SIR can be measured with a higher degree of accuracy without being influenced by a fast fading environment or an inter-station interference or noise environment.
    Type: Grant
    Filed: January 4, 2000
    Date of Patent: October 29, 2002
    Assignee: Fujitsu Limited
    Inventors: Hiroyuki Seki, Yoshinori Tanaka, Shuji Kobayakawa, Takeshi Toda, Masafumi Tsutsui
  • Publication number: 20020094262
    Abstract: A lift-up mechanism (50, 150) installed inside a vehicle serves to move a seat unit (10, 110) into or out of the vehicle. The seat unit (10, 110) is used as a passenger seat inside the vehicle and as a wheelchair outside the vehicle. Connecting plates (56, 156) are disposed on the lift-up mechanism (50, 150) permit the lift-up mechanism (50, 150) to be connected to the seat unit (10, 110) by inserting the connecting plates into connecting recesses (40, 140) formed in the seat unit (10, 110). Front wheels (60, 160) and rear wheels (70, 170) of the seat unit (10, 110) can be retracted and extended. A drive unit having an electric motor or similar drive may be provided to retract and extend the front wheels (60, 160) and the rear wheels (70, 170). An attitude changing arrangement may be provided to automatically chance the attitude of the front wheels (60, 160) when the front wheels (60, 160) and the rear wheels (70, 170) are retracted.
    Type: Application
    Filed: March 19, 2002
    Publication date: July 18, 2002
    Applicant: Toyota Shatai Kabushiki Kaisha
    Inventors: Yoshiro Suehiro, Masamitsu Iwatani, Takafumi Hijikata, Kenji Murabayashi, Mineki Ninomiya, Yoshiyuki Miura, Tomoyuki Kuroda, Takeshi Toda, Shigeyuki Matsunaga
  • Patent number: 6416272
    Abstract: A lift-up mechanism (50, 150) installed inside a vehicle serves to move a seat unit (10, 110) into or out of the vehicle. The seat unit (10, 110) is used as a passenger seat inside the vehicle and as a wheelchair outside the vehicle. Connecting plates (56, 156) are disposed on the lift-up mechanism (50, 150) permit the lift-up mechanism (50, 150) to be connected to the seat unit (10, 110) by inserting the connecting plates into connecting recesses (40, 140) formed in the seat unit (10, 110). Front wheels (60, 160) and rear wheels (70, 170) of the seat unit (10, 110) can be retracted and extended. A drive unit having an electric motor or similar drive may be provided to retract and extend the front wheels (60, 160) and the rear wheels (70, 170). An attitude changing arrangement may be provided to automatically change the attitude of the front wheels (60, 160) when the front wheels (60, 160) and the rear wheels (70, 170) are retracted.
    Type: Grant
    Filed: October 7, 1999
    Date of Patent: July 9, 2002
    Assignees: Toyota Shatai Kabushiki Kaisha, Kabushiki Kaisha Matsunaga Seisakusho
    Inventors: Yoshiro Suehiro, Masamitsu Iwatani, Takafumi Hijikata, Kenji Murabayashi, Mineki Ninomiya, Yoshiyuki Miura, Tomoyuki Kuroda, Takeshi Toda, Shigeyuki Matsunaga
  • Publication number: 20010053579
    Abstract: The present invention provides a manufacturing method of a semiconductor device having a single semiconductor substrate, for forming a first processing circuit portion and a second processing circuit portion having mutually different thicknesses of gate oxide films on the single semiconductor substrate including the steps of: forming a first gate oxide film over the semiconductor substrate; sequentially forming an insulating film and a first conducting layer over the entire surface of the first gate oxide film; eliminating those portions ranging from the first gate oxide film to the first conducting layer, which portions are included within an element forming region of the first processing circuit portion; and forming, only in the element forming region of the first processing circuit portion, a second gate oxide film having a thickness different from that of the first gate oxide film.
    Type: Application
    Filed: June 15, 2001
    Publication date: December 20, 2001
    Inventors: Takeshi Toda, Yoshiro Goto
  • Patent number: 6304624
    Abstract: A coherent detecting circuit accurately estimates a propagation characteristic of a propagation path without increasing the number of pilot symbols when a fading frequency is high so that an error rate of received data is decreased. At least one pilot symbol is received from a transmitter. The pilot symbol may be provided in a data frame of data symbols, or transmitted through a channel different from a channel of the data symbols. A first estimated value of the propagation characteristic of a propagation path is estimated by using the pilot symbol. The data symbols are tentatively determined based on an estimated value of the propagation path. A second estimated value of the propagation characteristic is estimated by using the pilot symbol and at lease one of the tentatively determined data symbols. The data symbols are finally determined based on the second estimated value of the propagation characteristic.
    Type: Grant
    Filed: October 7, 1998
    Date of Patent: October 16, 2001
    Assignee: Fujitsu Limited
    Inventors: Hiroyuki Seki, Yoshinori Tanaka, Shuji Kobayakawa, Takeshi Toda
  • Patent number: 6192067
    Abstract: A multistage interference canceller and method for removing interference between users and multipath interference from received signals in multiple stages includes a plurality of despreading units which produce a received symbol vector and an estimated channel value, a synthesis unit which synthesizes the received symbol vector, an amplitude of the received symbol vector and the amplitude of the estimated value from each reverse spreading unit, and a decision unit which executes a hard decision and a soft decision according to a result of comparing the total amplitude of the received symbol vector and the total amplitude of the estimated channel value.
    Type: Grant
    Filed: December 19, 1997
    Date of Patent: February 20, 2001
    Assignee: Fujitsu Limited
    Inventors: Takeshi Toda, Yoshinori Tanaka, Shuji Kobayakawa, Hiroyuki Seki, Masafumi Tsutsui
  • Patent number: 6157685
    Abstract: A multistage interference canceller equipment and interference canceller method for use, for example, in CDMA (Code Division Multiple Access) multibeam-antenna communication system includes in each stage an interference canceller unit which has a replica signal generator which generates from an input beam signal a first interference replica signal and outputs a first error signal, and an interference removal unit which receives from another replica signal generator a second interference replica signal, multiplies that second interference replica signal by conversion coefficients and subtracts an obtained signal from the first interference replica signal to produce a second error signal so that an error signal is generated for each signal beam from the interference replica signals of a local signal beam and other signal beams to eliminate interference.
    Type: Grant
    Filed: December 19, 1997
    Date of Patent: December 5, 2000
    Assignee: Fujitsu Limited
    Inventors: Yoshinori Tanaka, Shuji Kobayakawa, Hiroyuki Seki, Takeshi Toda, Masafumi Tsutsui
  • Patent number: 6144931
    Abstract: A wafer expansion-and-contraction simulation method in which stress (intrinsic stress) caused in a film forming process on a wafer is taken into consideration, the calculation time can be shorten, and a storage amount of data can be reduced. In the simulation method, an elastic thermal stress simulation when the temperature of the silicon wafer is increased from the room temperature to the film forming temperature is performed, and the displacement of the wafer thus obtained is reserved. Thereafter, an elastic thermal stress simulation when the temperature of the silicon wafer coated with the thin film is decreased from the film forming temperature to the room temperature is performed, and the displacement of the wafer thus obtained is reserved. In the simulation, thermal strain is uniformly applied to the thin film as corresponding to an intrinsic stress in the film forming process.
    Type: Grant
    Filed: March 26, 1998
    Date of Patent: November 7, 2000
    Assignee: NEC Corporation
    Inventor: Takeshi Toda
  • Patent number: 6058318
    Abstract: A reference antenna element out of plural antenna elements directed to the same sector is set as a first antenna element; a receiver for frequency conversion of the signal received by the first antenna element is set as a first receiver; any antenna element different from the first antenna element is set as a second antenna element; and a receiver for frequency conversion of the signal received by the second antenna element is set as a second receiver. The output signals of the first and second receivers relative to a specific up-signal are supplied to phase compensation calculator means, which then calculates the phase compensation amount representing the phase amount of the difference between the output-signal phase difference of the first and second receivers and the input-signal phase difference of the first and second receivers.
    Type: Grant
    Filed: February 10, 1998
    Date of Patent: May 2, 2000
    Assignee: Fujitsu Limited
    Inventors: Shuji Kobayakawa, Yoshinori Tanaka, Hiroyuki Seki, Takeshi Toda, Masafumi Tsutsui