Patents by Inventor Tetsuya Tsuruoka

Tetsuya Tsuruoka 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 headphone apparatus and wireless headphone system
    Patent number: 7209704
    Abstract: Herein disclosed is a wireless headphone apparatus, comprising: a plurality of light signal receiving units each for receiving a light signal to produce an electric signal having a signal level; a plurality of light signal limiting units respectively connected with the plurality of light signal receiving units in one to one relationship, each of the light signal limiting units operative to allow only an electric signal having a signal level lower than a predetermined threshold value to pass therethrough and delete an electric signal having a signal level equal to or greater than the predetermined threshold value; a signal synthesizing unit for synthesizing the electric signals passed through the light signal limiting units to produce a synthesized electric signal; and speaker means for outputting a sound in response to the synthesized electric signal.
    Type: Grant
    Filed: January 26, 2004
    Date of Patent: April 24, 2007
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Keiichi Kobata, Tetsuya Tsuruoka
  • Wireless headphone apparatus and wireless headphone system
    Publication number: 20040156522
    Abstract: Herein disclosed is a wireless headphone apparatus, comprising: a plurality of light signal receiving units each for receiving a light signal to produce an electric signal having a signal level; a plurality of light signal limiting units respectively connected with the plurality of light signal receiving units in one to one relationship, each of the light signal limiting units operative to allow only an electric signal having a signal level lower than a predetermined threshold value to pass therethrough and delete an electric signal having a signal level equal to or greater than the predetermined threshold value; a signal synthesizing unit for synthesizing the electric signals passed through the light signal limiting units to produce a synthesized electric signal; and speaker means for outputting a sound in response to the synthesized electric signal.
    Type: Application
    Filed: January 26, 2004
    Publication date: August 12, 2004
    Inventors: Keiichi Kobata, Tetsuya Tsuruoka