Patents by Inventor Hidefumi Nagai

Hidefumi Nagai 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).

  • Patent number: 5260920
    Abstract: A system for reproducing a sound field simulating a real acousting space includes a sound collecting device, a sound recording device and a sound reproducing device. The sound collecting device includes first and second collection systems, the first collection system having non-directional microphones at respective corners of a cube defining a hypothetical three-dimensional space in the real acoustic space and the second collection system having directional microphones of the same number as the non-directional microphones concentrically within the three-dimensional space with directivity of each of the directional microphones being set in the direction of one of the non-directional microphones with which the directional microphone constitutes a pair. Collected sounds by the first and second collection systems of the sound collection device are mixed with each other and recorded on a recording medium by the sound recording device, and further provided on the sound reproducing device.
    Type: Grant
    Filed: June 18, 1991
    Date of Patent: November 9, 1993
    Assignee: Yamaha Corporation
    Inventors: Hiroaki Ide, Hidefumi Nagai