TREA

Hirofumi Yanagawa

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  • Saitama, JP
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Patents Grantslast 30 patents

  • Information Patent Grant

    Method and apparatus for erasing acoustic echo
    • Patent number 5,987,143
    • Issue date Nov 16, 1999
    • Pioneer Electronic Corporation
    • Takatoshi Okuno
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Line source speaker system
    • Patent number 5,953,432
    • Issue date Sep 14, 1999
    • Pioneer Electronic Corporation
    • Hirofumi Yanagawa
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Sound field control system
    • Patent number 5,604,809
    • Issue date Feb 18, 1997
    • Pioneer Electronic Corporation
    • Hiroshi Tsubonuma
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Speaker system and method of controlling directivity thereof
    • Patent number 5,233,664
    • Issue date Aug 3, 1993
    • Pioneer Electronic Corporation
    • Hirofumi Yanagawa
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Sound field correcting apparatus
    • Patent number 5,128,999
    • Issue date Jul 7, 1992
    • Pioneer Electronic Corporation
    • Hirofumi Yanagawa
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Stereo sound system
    • Patent number 4,509,184
    • Issue date Apr 2, 1985
    • Pioneer Electronic Corporation
    • Hirofumi Yanagawa
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE