Patents by Inventor Hikoichi Ishigami

Hikoichi Ishigami 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).

  • Adaptive pitch detection system for voice signal
    Patent number: 4282406
    Abstract: A system for detecting the pitch of a voice signal, in which a plurality of pitch searching periods are determined so that pitch components of multiple relationship are not included in each of the pitch searching periods, and in which after detecting a pitch searching period including the pitch from the pitch searching periods, the pitch searching periods are adaptively shifted in a mannger to follow the change direction of the pitch predicted from the result of detection of the detected pitch.
    Type: Grant
    Filed: February 19, 1980
    Date of Patent: August 4, 1981
    Assignee: Kokusai Denshin Denwa Kabushiki Kaisha
    Inventors: Fumihiro Yato, Seishi Kitayama, Junso Tamura, Hikoichi Ishigami, Akira Kurematsu