Patents by Inventor Yaw S. Tang

Yaw S. Tang 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 and apparatus for measuring and compensating nonlinear bitshift
    Patent number: 5262904
    Abstract: A method and device for use in measurement and compensation of nonlinear bitshift in nonlinear communication media such as magnetic and optical recording devices. The method and device are based on special bit patterns constructed to eliminate at least one harmonic of the fundamental frequency of the data pattern if all bits are communicated without any nonlinear bitshift. The presence of nonlinear bitshift is manifested by the appearance of the harmonic. By measuring the magnitude of the harmonic, the amount of nonlinear bitshift is determined, and compensation adjustment is then used to offset its effect on the data detection scheme.
    Type: Grant
    Filed: January 22, 1991
    Date of Patent: November 16, 1993
    Assignee: International Business Machines Corporation
    Inventors: Yaw S. Tang, Ching H. Tsang