Patents by Inventor Nebuhiko Osawa

Nebuhiko Osawa 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).

  • Demodulation clock generator circuit
    Patent number: 4882546
    Abstract: A demodulation clock generator circuit employed in a modulation system such as a bi-phase mark system is improved by including a frequency detector to speed up the initial processing of a data signal to be demodulated. The frequency detector generates a frequency detection signal which corresponds to a signal from an oscillator and a signal from a synchronization signal portion of the signal to be demodulated. The frequency detector includes a memory portion clocked by the oscillator for storing the states of the signal to be demodulated and a signal generating portion for supplying the frequency detection signal when information stored in the memory portion is the same as a synchronizing portion of the signal to be demodulated and has a frequency of less than a predetermined value.
    Type: Grant
    Filed: January 19, 1989
    Date of Patent: November 21, 1989
    Assignees: Pioneer Electronic Corporation, Pioneer Video Corporation
    Inventors: Yoshinobu Takamura, Norimichi Katsumura, Nebuhiko Osawa, Kazuo Watanabe