Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Within duct
Patent
1997-06-10
2000-07-04
Harvey, Minsun Oh
Electrical audio signal processing systems and devices
Acoustical noise or sound cancellation
Within duct
381 717, 381224, A61F 1106, G10K 1116, H03B 2900
Patent
active
060849711
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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Harvey Minsun Oh
Siemens Electric Limited
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