Patents by Inventor Kaoru Okabe

Kaoru Okabe 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).

  • Wireless communication device
    Patent number: 7088954
    Abstract: A wireless communication apparatus of the present invention has an interference signal cutoff circuit (10) for cutting off electric waves having interference frequencies of ?f=|frx±ftx| interposed between a receiving antenna (1) and a receiver (5). A transmitter (6) is connected to a transmitting antenna (11). In this way, provision of the interference signal cutoff circuit (10) makes it possible to prevent degradation of reception characteristics, the degradation being caused such that the transmission wave radiated from the transmitter (6) and input to the receiver (5), mainly via the receiving antenna 1 is modulated with interference waves by active elements provided in the receiver (5) to generate interference waves having the same frequency as the reception frequency frx.
    Type: Grant
    Filed: March 30, 2001
    Date of Patent: August 8, 2006
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Tai Miyagawa, Kaoru Okabe, Tetsuo Onodera
  • Wireless communication device
    Publication number: 20030143970
    Abstract: A wireless communication apparatus of the present invention has an interference signal cutoff circuit (10) for cutting off electric waves having interference frequencies of &Dgr;f=|frx±ftx| interposed between a receiving antenna (1) and a receiver (5). A transmitter (6) is connected to a transmitting antenna (11).
    Type: Application
    Filed: September 30, 2002
    Publication date: July 31, 2003
    Inventors: Tai Miyagawa, Kaoru Okabe, Tetsuo Onodera
  • Earphone characteristic measuring device
    Patent number: 4586194
    Abstract: An earphone characteristic measuring device comprises an acoustic coupler having an acoustic tube simulated to an external auditory canal in which an earphone under measurement is to be inserted and an acoustic tube of a smaller diameter having an acoustic impedance of approximately 320 ohms connected to an end of the first acoustic tube, a sound source for emitting an impulse sound to the acoustic coupler, a microphone mounted at the end of the first acoustic tube for picking up sound pressure information and a characteristic calculation circuit for transforming an earphone characteristic of the acoustic coupler to an earphone characteristic of a real ear based on an input impedance of the acoustic coupler viewed from an end of the earphone inserted in the acoustic coupler and an input impedance of the real ear represented by a sum of an eardrum impedance of the real ear and an external auditory canal volume of the real ear, stored in a memory in response to the sound pressure information from the microphone
    Type: Grant
    Filed: February 2, 1984
    Date of Patent: April 29, 1986
    Assignee: Hitachi, Ltd.
    Inventors: Makoto Kohashi, Tanetoshi Miura, Kaoru Okabe, Haruo Hamada