Active noise cancelling muffler
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United States of America Patent
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May 5, 1998
Issued Date -
N/A
app pub date -
Jun 25, 1996
filing date -
Mar 24, 1993
priority date (Note) -
Expired
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Abstract
An active muffler noise cancellation system having an active controller, a speaker housing with acoustic compliance spaces, a duct extension in communication with said speaker housing and adapted to conform a dipole radiation pattern into a plane wave which can be measured by a microphone.
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