Patents by Inventor Takayuki IBUSUKI

Takayuki IBUSUKI 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).

  • Audio output circuit for driving an electroacoustic conversion element
    Patent number: 9762187
    Abstract: An audio output circuit drives an electroacoustic conversion element. A Class D amplifier has a segmented configuration including multiple segments arranged in parallel. A pulse modulator pulse modulates an audio signal. A level detector detects the amplitude of the audio signal. A driver selectively drives the multiple segments of the Class D amplifier according to the output of the level detector.
    Type: Grant
    Filed: March 27, 2015
    Date of Patent: September 12, 2017
    Assignee: ROHM CO., LTD.
    Inventors: Takayuki Ibusuki, Naotaka Saito, Hideo Araki
  • Switching circuit
    Patent number: 9525390
    Abstract: A switching circuit generates a switching pulse that is pulse modulated according to an input signal. An error amplifier includes a phase compensating filter that generates a feedback signal corresponding to the switching pulse. The error amplifier generates an error signal corresponding to a difference between the input signal and the feedback signal. A pulse modulator includes an oscillator that generates a carrier signal having a variable frequency. The pulse modulator pulse-modulates the carrier signal according to the error signal, so as to generate a pulse modulated signal. The phase compensating filter is configured such that its frequency characteristics can be adjusted according to the frequency of the carrier signal.
    Type: Grant
    Filed: August 19, 2015
    Date of Patent: December 20, 2016
    Assignee: ROHM CO., LTD.
    Inventor: Takayuki Ibusuki
  • SWITCHING CIRCUIT
    Publication number: 20160056771
    Abstract: A switching circuit generates a switching pulse that is pulse modulated according to an input signal. An error amplifier includes a phase compensating filter that generates a feedback signal corresponding to the switching pulse. The error amplifier generates an error signal corresponding to a difference between the input signal and the feedback signal. A pulse modulator includes an oscillator that generates a carrier signal having a variable frequency. The pulse modulator pulse-modulates the carrier signal according to the error signal, so as to generate a pulse modulated signal. The phase compensating filter is configured such that its frequency characteristics can be adjusted according to the frequency of the carrier signal.
    Type: Application
    Filed: August 19, 2015
    Publication date: February 25, 2016
    Inventor: Takayuki IBUSUKI
  • AUDIO OUTPUT CIRCUIT
    Publication number: 20150281831
    Abstract: An audio output circuit drives an electroacoustic conversion element. A Class D amplifier has a segmented configuration including multiple segments arranged in parallel. A pulse modulator pulse modulates an audio signal. A level detector detects the amplitude of the audio signal. A driver selectively drives the multiple segments of the Class D amplifier according to the output of the level detector.
    Type: Application
    Filed: March 27, 2015
    Publication date: October 1, 2015
    Inventors: Takayuki IBUSUKI, Naotaka SAITO, Hideo ARAKI