Patents by Inventor Toshinari Chiba

Toshinari Chiba 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).

  • EFM signal frame period detecting circuit, and system for controlling the frequency of the bit synchronizing clock signal used for reproducing the EFM signal
    Patent number: 6118393
    Abstract: A system for controlling the frequency of a bit synchronizing clock signal used for reproducing an EFM signal, comprises an EFM signal frame period detecting circuit for frequency-dividing an EFM signal by 117 to output a 1/117 frequency-divided signal as a frame period signal. A control unit counts the level transition interval of the EFM signal by the bit synchronizing clock signal, selects a maximum count value in a detecting duration defined by each frame period signal, and compares the maximum count value with a predetermined value corresponding to the bit length of a frame synchronizing signal included in the EFM signal.
    Type: Grant
    Filed: June 22, 1998
    Date of Patent: September 12, 2000
    Assignee: NEC Corporation
    Inventors: Toshinari Chiba, Hiromichi Nogawa