Patents Assigned to Niigatu Seimitsu Co., Ltd.
  • Audio reproducing device and method, audio amplifier, and integrated circuit for audio amplifier
    Publication number: 20040131193
    Abstract: A digital &Dgr;&Sgr; modulated signal produced by a quantizer (1c) in a &Dgr;&Sgr; modulation processing unit (1) is put in to a feedback loop before inputted to a power switch (2) and converted into an analog signal by a D/A converter (1d). This analog signal is fed back to the input stage (a differentiator (1a)) of the &Dgr;&Sgr; processing unit (1) to prevent the switching distortion of the power switch (2) itself from being introduced into the feedback loop thereby to suppress the influence of the switching distortion.
    Type: Application
    Filed: December 22, 2003
    Publication date: July 8, 2004
    Applicant: Niigatu Seimitsu Co., Ltd.
    Inventor: Mamoru Kitamura