Patents by Inventor Michitoshi Minami

Michitoshi Minami 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).

  • Amplitude modulation circuit and method
    Patent number: 5578971
    Abstract: An amplitude modulation circuit and method. A predetermined number of (e.g., 6) drivers and differentially switched power amplifiers are provided in pairs. A program sound signal which has been quantized into a predetermined number of bits (e.g., 12 bits) is divided through a ROM into a plurality of bit groups each consisting of a predetermined number of bits (e.g., 2 bits), which are in turn distributed to the respective driver and differentially switched power amplifier pairs. In response to the value of the distributed bit group, each driver selects two different phase-shift carriers from seven different phase-shift carriers, and provides as its outputs .phi..sub.A and .phi..sub.B. With the output phase-shift carriers (.phi..sub.A and .phi..sub.B), each driver differentially switches the differentially switched power amplifier corresponding thereto. The output of each differentially switched power amplifier is weighted.
    Type: Grant
    Filed: December 26, 1995
    Date of Patent: November 26, 1996
    Assignees: Japan Radio Co., Ltd., Nippon Hoso Kyokai
    Inventors: Michitoshi Minami, Yutaka Kojima, Kazuhisa Hayeiwa, Hisashi Naka