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Title:
【発明の名称】吸音のための制御音響導波管
Document Type and Number:
Japanese Patent JP2002532999
Kind Code:
A
Abstract:
The invention relates to a controlled acoustic wave guide configured as an elongated hollow chamber ( 1 ) which via an opening ( 2 ) in its first face end ( 3 ) is connected to a sound-conducting channel ( 4 ). The longitudinal resonances of the hollow chamber ( 1 ) can be adjusted to a sound spectrum to be dampened. To this end diaphragm vibrations are detected by means of a microphone ( 10 ) which is positioned directly in front of the diaphragm ( 8 ) of at least one loud-speaker ( 9 ) at the second face-end ( 6 ) of the hollow chamber ( 1 ). The microphone signal is then inverted using an amplifier ( 11 ) and fed back to the loud-speaker ( 9 ) after amplification in accordance with a sensor ( 12 ) signal characterizing the sound spectrum in the channel ( 4 ).

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Inventors:
Jan Kruger
Philip Ristner
Application Number:
JP2000588756A
Publication Date:
October 02, 2002
Filing Date:
December 15, 1999
Export Citation:
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Assignee:
Fraunhofer-Gesellschaft Tourfoldung der Angewanten Forschung A Fau
International Classes:
F01N1/02; F01N1/06; F01N1/22; F16L55/04; G10K11/172; F01N1/00; G10K11/178; H04R3/04; (IPC1-7): H04R3/04; F01N1/00; F16L55/04; G10K11/178
Attorney, Agent or Firm:
Aoyama Ryo (1 person outside)