Active exhaust silencer

Details Active exhaust silencer Active exhaust silencer

1996-07-29

1997-12-02

Dang, Khanh

Acoustics

Sound-modifying means

By wave interference

381 71, F01N 106

Patent

active

056939183

ABSTRACT:
An active silencer for a vehicle exhaust system that is constructed so that it can be hung underneath the vehicle without altering the vehicle. The silencer has a chamber isolated from the exhaust flow. A duct spans longitudinally through the chamber. One or more loudspeakers (e.g. 2 or 4 loudspeakers) are mounted on the duct side-by-side. The loudspeakers share a common tuning volume within the duct which is ported to a mixing apparatus where the canceling acoustic wave mixes with noise from the exhaust flow before the exhaust noise exits to the atmosphere.

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