Patents by Inventor Shinji Yamakado

Shinji Yamakado 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).

  • FSK modulator
    Patent number: 5835539
    Abstract: The FSK modulator for modulating binary data of the present invention has an object to provide an FSK modulator which can operate at a stable frequency also when a discontinuous data row is entered. The FSK modulator comprises a PLL (phase locked loop) in which binary data is entered at two types of voltage levels different each other, an oscillation output of the PLL treated as output data of the modulator, allows a voltage at an almost-intermediate level to the PLL instead of binary data when the binary data has not been entered.
    Type: Grant
    Filed: February 11, 1997
    Date of Patent: November 10, 1998
    Assignee: NEC Corporation
    Inventor: Shinji Yamakado