Patents by Inventor Haruto Katsu

Haruto Katsu 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).

  • Digital information signal reproducing circuit and digital information system
    Patent number: 5937020
    Abstract: Digital information including a sync data field and a user data field subsequent thereto is read from a storage media as a digital information signal in an analog signal format. The obtained signal is sampled according to a clock signal and is thereby transformed into a digital information signal in a digital format. In the sync data field, the clock signal is synchronized with the digital information signal by an analog PLL circuit. Thereafter, in the user data field, the clock signal is synchronized with the digital information signal by a digital PLL circuit.
    Type: Grant
    Filed: September 25, 1996
    Date of Patent: August 10, 1999
    Assignee: Hitachi, Ltd.
    Inventors: Kenichi Hase, Ryutaro Horita, Tsuguyoshi Hirooka, Haruto Katsu, Takashi Nara, Shoichi Miyazawa, deceased, Shintaro Suzumura