Patents by Inventor Yumi Hirasawa

Yumi Hirasawa 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).

  • High frequency compensator and reproducing device
    Patent number: 7324024
    Abstract: A high frequency compensator configured to compensate high frequency component of a digital audio signal comprising a down sampler configured to perform ½ down-sampling for the digital audio signal. An up sampler is configured to perform double up-sampling for an output signal of the down-sampler. A digital low-pass filter is configured to filter an output signal of the up sampler, and to output the filtered digital audio signal.
    Type: Grant
    Filed: February 28, 2006
    Date of Patent: January 29, 2008
    Assignees: Sanyo Electric Co., Ltd.
    Inventors: Koji Fujiyama, Naoya Iwasaki, Yumi Hirasawa, Yutaka Yamamoto
  • HIGH FREQUENCY COMPENSATOR AND REPRODUCING DEVICE
    Publication number: 20060267825
    Abstract: A high frequency compensator configured to compensate high frequency component of a digital audio signal comprising a down sampler configured to perform ½ down-sampling for the digital audio signal. An up sampler is configured to perform double up-sampling for an output signal of the down-sampler. A digital low-pass filter is configured to filter an output signal of the up sampler, and to output the filtered digital audio signal.
    Type: Application
    Filed: February 28, 2006
    Publication date: November 30, 2006
    Applicants: SANYO ELECTRIC CO., LTD.
    Inventors: Koji FUJIYAMA, Naoya IWASAKI, Yumi HIRASAWA, Yutaka YAMAMOTO
  • High frequency compensator and reproducing device
    Publication number: 20060192706
    Abstract: A high frequency compensator includes a down sampler configured to perform ½ down-sampling for a compressed and expanded digital audio signal. An up sampler is configured to perform double up-sampling for an output signal of the down-sampler. A digital low-pass filter is configured to filter an output signal of the up sampler. A digital high-pass filter is configured to filter an output signal of the digital low-pass filter. An adder is configured to add an output signal of the digital high-pass filter to the compressed and expanded digital audio signal, and to output a digital audio signal generated by the adding.
    Type: Application
    Filed: February 27, 2006
    Publication date: August 31, 2006
    Inventors: Koji Fujiyama, Naoya Iwasaki, Yumi Hirasawa