Patents by Inventor Ta Tzu Wu

Ta Tzu Wu 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).

  • Demodulator for binary-phase modulated signals having a variable clock rate
    Patent number: 3988688
    Abstract: Method and apparatus for demodulating binary-phase modulated signals recorded on a magnetic stripe on a card as the card is manually inserted into a card reader. Magnetic transitions are sensed as the card is read and the time interval between immediately preceeding basic transitions determines the duration of a data sampling pulse which detects the presence or absence of an intermediate transition pulse indicative of two respective logic states. The duration of the data sampling pulse is approximately 75 percent of the preceeding interval between basic transitions to permit tracking succeeding time differences in basic transition intervals of up to approximately 25 percent.
    Type: Grant
    Filed: February 28, 1975
    Date of Patent: October 26, 1976
    Assignee: California Institute of Technology
    Inventor: Ta Tzu Wu