Patents by Inventor Tsunehiko Hongoh

Tsunehiko Hongoh 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).

  • Digital signal processing device and audio signal reproduction device
    Patent number: 7038606
    Abstract: An audio signal reproduction device of the invention has a seventh-order delta-sigma modulation circuit that receives a PCM signal and that performs delta-sigma modulation on the PCM signal, a PWM circuit that performs pulse width modulation on the signal outputted from the seventh-order delta-sigma modulation circuit to produce a one-bit digital signal, a switching amplifier that converts the one-bit digital signal into an analog signal and that then amplifies it, and a low-pass filter that eliminates high-frequency components of the analog signal. This configuration permits size and weight reduction.
    Type: Grant
    Filed: October 23, 2003
    Date of Patent: May 2, 2006
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Tsunehiko Hongoh, Hirotoshi Yamamoto
  • Digital signal processing device and audio signal reproduction device
    Publication number: 20050122244
    Abstract: An audio signal reproduction device of the invention has a seventh-order delta-sigma modulation circuit that receives a PCM signal and that performs delta-sigma modulation on the PCM signal, a PWM circuit that performs pulse width modulation on the signal outputted from the seventh-order delta-sigma modulation circuit to produce a one-bit digital signal, a switching amplifier that converts the one-bit digital signal into an analog signal and that then amplifies it, and a low-pass filter that eliminates high-frequency components of the analog signal. This configuration permits size and weight reduction.
    Type: Application
    Filed: October 23, 2003
    Publication date: June 9, 2005
    Inventors: Tsunehiko Hongoh, Hirotoshi Yamamoto