Patents by Inventor Ryuusuke Horibe

Ryuusuke Horibe 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).

  • Data playback equipment for playing back data recorded on a disk medium
    Patent number: 7171608
    Abstract: In playback of data recorded on an optical disk, an error minimization circuit holds a plurality of ideal values for partial response (PR) equalization as equalization targets, and updates tap coefficients of a finite impulse response (FIR) filter so that the errors between the outputs of the FIR filter reflecting the output of an analog-to-digital converter (ADC) and the equalization targets are minimized. An error detection circuit and an addition/weighting circuit generate a signal representing the errors between the outputs of the FIR filter and the equalization targets as a parameter signal correlated with the error rate of played-back data. The quality of the analog signal is adjusted so that the parameter signal is minimized, to thereby optimize the margin of the error rate of played-back data.
    Type: Grant
    Filed: September 22, 2003
    Date of Patent: January 30, 2007
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kazutoshi Aida, Toshihiko Takahashi, Ryuusuke Horibe
  • Data playback equipment
    Publication number: 20040059986
    Abstract: In playback of data recorded on an optical disk, an error minimization circuit holds a plurality of ideal values for partial response (PR) equalization as equalization targets, and updates tap coefficients of a finite impulse response (FIR) filter so that the errors between the outputs of the FIR filter reflecting the output of an analog-to-digital converter (ADC) and the equalization targets are minimized. An error detection circuit and an addition/weighting circuit generate a signal representing the errors between the outputs of the FIR filter and the equalization targets as a parameter signal correlated with the error rate of played-back data. The quality of the analog signal is adjusted so that the parameter signal is minimized, to thereby optimize the margin of the error rate of played-back data.
    Type: Application
    Filed: September 22, 2003
    Publication date: March 25, 2004
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Kazutoshi Aida, Toshihiko Takahashi, Ryuusuke Horibe