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15th October 2004, 07:29 PM
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#1 |
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diyAudio Member
Join Date: Jul 2004
Location: Pasadena, CA
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SilenceAir: Noise Blocking Bricks
Anybody know how these work ? Helmholtz resonators?
SilenceAir looks like a transparent brick, and uses "passive resonators" to allow fresh air into buildings while leaving 85% of the noise behind. The arrays of resonators inside the bricks are tuned to block sounds in the range of 500Hz to 2kHz. |
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15th October 2004, 08:31 PM
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#2 |
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diyAudio Member
Join Date: Jul 2003
Location: Seattle, WA
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That would be my guess, a tuned band stop filter i.e.; Helmholtz resonator.
http://www.kettering.edu/~drussell/G...s/Filters.html |
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