Patents by Inventor Keith K. Yamashiro

Keith K. Yamashiro 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).

  • Subsampled carrier recovery for high data rate demodulators
    Patent number: 5692014
    Abstract: A high performance, low cost technique for carrier recovery and tracking of high rate demodulator (>200 Mbps to multi-gigabits per second) system is presented. The locally generated carrier is held in phase locked synchronism with the incoming modulated carrier through a carrier recovery scheme in which the modulated data is detected and subsampled using the bit synchronizing circuitry to provide a strobe signal for subsampling. The voltage levels of the subsampled data are analyzed to determine a phase error signal. The subsampled data are used to address a lookup table of error values stored in memory.
    Type: Grant
    Filed: February 3, 1995
    Date of Patent: November 25, 1997
    Assignee: TRW Inc.
    Inventors: Jack K. Basham, Keith K. Yamashiro, Pascal G. Finkenbeiner, Thomas J. Kolze