초록 ▼

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 loudspeake

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.

대표청구항 ▼

An active silencer for cancelling noise propagating through an exhaust pipe comprising: a chamber having an enclosing wall structure with an outer wall, a front end wall and a rear end wall; a duct separating the chamber into a first volume within the duct and a second volume outside of the duct, th

An active silencer for cancelling noise propagating through an exhaust pipe comprising: a chamber having an enclosing wall structure with an outer wall, a front end wall and a rear end wall; a duct separating the chamber into a first volume within the duct and a second volume outside of the duct, the duct having a speaker hole therein; a loudspeaker mounted to the duct through the speaker hole so that a diaphragm of the speaker is in acoustic communication with the first volume within the duct; and a port extending through the front end wall of the chamber from the first volume within the duct, the port communicating acoustically with noise propagating through the exhaust pipe; wherein the duct has a rectangular cross-section and the speaker hole is through a first wall of the duct, and the duct further includes a second speaker hole through the first wall of the duct; and the active silencer further comprises a second loudspeaker mounted to the duct through the second speaker hole so that a diaphragm of the second speaker is in acoustic communication with the first volume within the duct.