Patents by Inventor Yoshihiro HORII

Yoshihiro HORII 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).

  • DAC device and audio system
    Patent number: 9218816
    Abstract: In a DAC device, a distortion correction function g1(x) of a harmonic obtained from a result of a frequency analysis on an analog output signal of a DAC circuit is obtained. A correction value is determined based on the correction function g1(x) in accordance with an input digital signal, and is previously stored in a memory. A nonlinear correction circuit reads a corresponding correction value from the memory in accordance with the value of a digital signal output from a digital filter, and transmits the correction value to a subtractor. The subtractor subtracts the correction value from the digital signal output from the digital filter.
    Type: Grant
    Filed: March 13, 2014
    Date of Patent: December 22, 2015
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Toshihiro Torii, Yoshihiro Horii, Masashi Uchida, Junji Nakatsuka, Takaaki Sato
  • DAC DEVICE AND AUDIO SYSTEM
    Publication number: 20140195225
    Abstract: In a DAC device, a distortion correction function g1(x) of a harmonic obtained from a result of a frequency analysis on an analog output signal of a DAC circuit is obtained. A correction value is determined based on the correction function g1(x) in accordance with an input digital signal, and is previously stored in a memory. A nonlinear correction circuit reads a corresponding correction value from the memory in accordance with the value of a digital signal output from a digital filter, and transmits the correction value to a subtractor. The subtractor subtracts the correction value from the digital signal output from the digital filter.
    Type: Application
    Filed: March 13, 2014
    Publication date: July 10, 2014
    Applicant: PANASONIC CORPORATION
    Inventors: Toshihiro TORII, Yoshihiro HORII, Masashi UCHIDA, Junji NAKATSUKA, Takaaki SATO