Patents by Inventor Tatsuya Endoh

Tatsuya Endoh 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).

  • System and method for setting a read/write offset and for recovering from data read errors
    Patent number: 6650491
    Abstract: An RW offset setting method which includes recording a test pattern by a write head, reading the test pattern by a read head, measuring an amplitude of a read back signal at each tracking position, finding an approximate expression of a profile of the measured amplitude, finding a tracking position, and finding a RW offset based on this tracking position, setting a RW offset for all tracks in the disk device based on the RW offsets about the plurality of tracks to be measured. A read data error recovery method that includes the steps of determining an off-track direction where the amplitude increases, searching an off-track position where the amplitude becomes a local maximum, measuring the amplitude at each off-track position reading data recorded in the data sector.
    Type: Grant
    Filed: February 23, 2001
    Date of Patent: November 18, 2003
    Assignee: International Business Machines Corporation
    Inventors: Hiroaki Suzuki, Kaoru Umemura, Akira Shibata, Tatsuya Endoh, Takao Matsui, Masaomi Ikeda, Junji Hashimoto
  • Method and apparatus for adaptive resonance mode cancellation servo in a rotating storage system
    Patent number: 6574065
    Abstract: A method and apparatus for adaptive resonance cancellation in a rotating storage system, includes designing a set of digitally selectable optimum resonance cancellation filters, generating a series of excitation signals for injection into the filters, generating a characteristic resonance frequency based on the excitation signals, and computing an address pointer corresponding to the resonance frequency, to select an optimum resonance cancellation filter.
    Type: Grant
    Filed: May 14, 1999
    Date of Patent: June 3, 2003
    Assignee: International Business Machines Corporation
    Inventors: Sri M. Sri-Jayantha, Arun Sharma, Hien Dang, Tetsuo Ueda, Kenji Okada, Hideo Asano, Tatsuya Endoh, Masayuki Takeuchi
  • System and method for setting a read/write offset and for recovering from data read errors
    Publication number: 20010028522
    Abstract: An RW offset setting method which includes recording a test pattern by a write head, reading the test pattern by a read head, measuring an amplitude of a read back signal at each tracking position, finding an approximate expression of a profile of the measured amplitude, finding a tracking position, and finding a RW offset based on this tracking position, setting a RW offset for all tracks in the disk device based on the RW offsets about the plurality of tracks to be measured. A read data error recovery method that includes the steps of determining an off-track direction where the amplitude increases, searching an off-track position where the amplitude becomes a local maximum, measuring the amplitude at each off-track position reading data recorded in the data sector.
    Type: Application
    Filed: February 23, 2001
    Publication date: October 11, 2001
    Inventors: Hiroaki Suzuki, Kaoru Umemura, Akira Shibata, Tatsuya Endoh, Takao Matsui, Masaomi Ikeda, Junji Hashimoto