Patents by Inventor KokHiang Cheong

KokHiang Cheong 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).

  • Repeatable runout compensation using a learning algorithm with scheduled parameters
    Patent number: 6437936
    Abstract: A method and apparatus for compensating for written-in repeatable runout in a disc drive is provided. Compensation values are determined through an iterative learning process in which parameters of the learning process such as learning gain, servo loop gain, etc. are functions of the iteration number. The learning process also employs a nominal double integrator model of an actuator of the disc storage system. The learning process is also a function of a zero-phase low-pass filter.
    Type: Grant
    Filed: January 21, 2000
    Date of Patent: August 20, 2002
    Assignee: Seagate Technology LLC
    Inventors: YangQuan Chen, LeeLing Tan, KianKeong Ooi, Qiang Bi, KokHiang Cheong