Patents by Inventor Masao Ichimura

Masao Ichimura 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).

  • Multi-directional sound signal reproducing system
    Patent number: 4075425
    Abstract: The present invention is to increase the carrier level so as to improve the S/N ratio when the factor T.sub.93, T.sub.T or T.sub.Q is small in level. When the level is low, noises are apt to be offensive to a listener's ear, but the reproducing level may be judged by the low level of T.sub..SIGMA., T.sub.T or T.sub.Q. Accordingly, the low level of T.sub..SIGMA. or T.sub.T is detected to raise the carrier level, and to reduce an FM demodulation noise and hence to improve the total S/N ratio.
    Type: Grant
    Filed: September 19, 1975
    Date of Patent: February 21, 1978
    Assignee: Nippon Columbia Kabushikikaisha
    Inventors: Yoshihisa Kamo, Takeshi Tachibana, Masao Ichimura