Noise modulating device for use in motor vehicle, has chamber acoustically connected with passenger compartment and/or surrounding space of vehicle over sound outlet part, and volume changing device adjusting volume of sub chamber

摘要

The device has a hollow body (10) divided into two chambers (14a, 14b) by acoustically inactive wall (12). A sound transmitting device (16) has oscillatable elements (20a, 20b) transmitting sound from the chamber (14a) into the chamber (14b). The chamber (14a) is connected with a gas guiding part of an internal combustion engine of a motor vehicle over a sound inlet part (22). The chamber (14b) is acoustically connected with a passenger compartment and/or surrounding space of the vehicle over a sound outlet part (24). A volume changing device (28) adjusts volume of a sub chamber (18).