Active noise attenuation system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Jul 4, 2000
Grant Date -
N/A
app pub date -
Jun 10, 1997
filing date -
Jun 10, 1997
priority date (Note) -
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Importance
Abstract
A noise attenuation system for the air induction ducting particularly for an internal combustion engine has an outwardly facing loudspeaker mounted within an air inlet duct so as to lie in the plane of the air intake opening. Signals from an error microphone (and also optionally a detector microphone) are processed in a signal controller, the output driver used to drive the loudspeaker so that a cancellation sound field is produced, which attenuates the noise emanating from the air intake. The speaker is mounted on a fairing body creating an annular flow passage, a filter element ring inserted in the annular space.
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