Active acoustic attenuation system for higher order mode non-uniform sound field in a duct
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United States of America Patent
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Mar 21, 1989
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N/A
app pub date -
Mar 16, 1988
filing date -
Mar 16, 1988
priority date (Note) -
Expired
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Abstract
A system is provided for increasing the frequency range of an active acoustic attenuation system in a duct without increasing cut-off frequency f.sub.c of the duct or otherwise splitting or partitioning the duct into separate ducts or chambers. The frequency range is increased above f.sub.c to include higher order modes. A plurality of cancelling model sets are provided. Each transverse portion of the acoustic pressure wave has its own set of an adaptive filter model, cancelling speaker, and error microphone. A single input microphone may service all sets.
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