Patents by Inventor Arai Masashi

Arai Masashi 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).

  • Amplifier with peak and bottom signal level shifting control
    Patent number: 5574714
    Abstract: A signal level adjusting unit adjusts levels of EFM signals, read from an optical disk, to given levels, and comprises a peak value detector, a peak value comparing circuit issuing a control signal on the basis of the difference between a peak value and a reference value, a bottom value detector, a bottom value comparing circuit issuing a shift signal in accordance with a difference between a bottom value and a reference value, an amplifier amplifying the EFM signal with an amplification factor in response to the control signal, and a level shift circuit level-shifting the EFM signals in response to the level shift signals.
    Type: Grant
    Filed: November 21, 1994
    Date of Patent: November 12, 1996
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Arai Masashi, Tsukihashi Akira