Patents by Inventor Ming-Hua Hsueh

Ming-Hua Hsueh 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).

  • Method for determining phase difference of tracking error signal in optical disc drive
    Patent number: 8422347
    Abstract: A method for determining a phase difference of a tracking error signal is provided. The method includes: predetermining a plurality of phase differences, measuring MPP and SPP signals, establishing a phase difference curve by use of an amplitude ratio between (MPP+SPP) and (MPP?SPP), measuring MPP and SPP signals for a tracking error signal under test, calculating the amplitude ratio (MPP+SPP)/(MPP?SPP), and comparing with the phase difference curve to promptly determine the phase difference.
    Type: Grant
    Filed: March 6, 2012
    Date of Patent: April 16, 2013
    Assignee: Quanta Storage Inc.
    Inventors: Ming-Hua Hsueh, Yi-Long Hsiao
  • METHOD FOR DETERMINING PHASE DIFFERENCE OF TRACKING ERROR SIGNAL
    Publication number: 20120263027
    Abstract: A method for determining a phase difference of a tracking error signal is provided. The method includes: predetermining a plurality of phase differences, measuring MPP and SPP signals, establishing a phase difference curve by use of an amplitude ratio between (MPP+SPP) and (MPP?SPP), measuring MPP and SPP signals for a tracking error signal under test, calculating the amplitude ratio (MPP+SPP)/(MPP?SPP), and comparing with the phase difference curve to promptly determine the phase difference.
    Type: Application
    Filed: March 6, 2012
    Publication date: October 18, 2012
    Applicant: QUANTA STORAGE INC.
    Inventors: Ming-Hua Hsueh, Yi-Long Hsiao
  • METHOD FOR DETERMINING ECCENTRICITY OF OPTICAL DISC
    Publication number: 20120263026
    Abstract: A method for determining an eccentricity of an optical disc is provided. The method includes predetermining a plurality of optical disc with known eccentric distances, respectively measuring a ratio of maximum and minimum amplitudes of a tracking error signal of the optical discs, establishing an eccentric distance ratio table or curve, measuring a ratio of maximum and minimum amplitudes of the tracking error signal for an optical disc under test, and comparing the measured ratio with the table or curve to promptly determine the eccentricity distance of the optical disc under test.
    Type: Application
    Filed: March 6, 2012
    Publication date: October 18, 2012
    Applicant: Quanta Storage Inc.
    Inventors: Ming-Hua Hsueh, Yi-Long Hsiao