Patents by Inventor Takahiro Nakauma

Takahiro Nakauma 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).

  • Sound reproducing apparatus
    Patent number: 4972489
    Abstract: A sound reproduction system suitable for automobile, the reproduction system having a band-pass filter, a phase-shifter for shifting the output of the band-pass filter and a mixer which mixes the output of the phase-shifter with the original audio signal at a suitable mixing ratio, whereby a low frequency standing wave which is generally produced in the small automobile room may be eliminated, thereby providing a desirable frequency response characteristic.
    Type: Grant
    Filed: September 21, 1989
    Date of Patent: November 20, 1990
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Shinichi Oki, Toshihiko Ohashi, Fumiyasu Konno, Hiroshi Yagi, Takahiro Nakauma