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Controlled acoustic waveguide for soundproofing

  • US 6,963,647 B1
  • Filed: 12/15/1999
  • Issued: 11/08/2005
  • Est. Priority Date: 12/15/1998
  • Status: Expired due to Fees
First Claim
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1. Controlled acoustic waveguide for use with an elongate hollow chamber, connected to at least one sound-transmitting duct via an opening on its first end surface thereof, comprising a microphone for detecting membrane vibrations so as to allow tunability of longitudinal resonances of the hollow chamber to a sound spectrum to be attenuated, the microphone being located directly in front of a membrane of at least one loudspeaker on a second end surface of the hollow chamber, and an amplifier for inverting a microphone signal, with feedback of the inverted microphone signal to said loudspeaker being in an amplified form in dependence on a sensor signal characteristic of sound in the sound-transmitting duct.

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