초록 ▼

An noise attenuation system disposed on a movable side glass (14) of a motor vehicle for reducing the noise within the passenger compartment. In the preferred embodiment, a piezoceramic sensor (46) and piezoceramic actuators (42, 44) are disposed on a side glass (14) below the beltline (24) of a doo

An noise attenuation system disposed on a movable side glass (14) of a motor vehicle for reducing the noise within the passenger compartment. In the preferred embodiment, a piezoceramic sensor (46) and piezoceramic actuators (42, 44) are disposed on a side glass (14) below the beltline (24) of a door (10) on a motor vehicle. The actuators (42, 44) are controllably vibrated in reverse phase to a signal generated by the sensor (46) to cancel or reduce vibrations of the side glass (14). The noise transmitted into the passenger compartment by the side glass (14) is thereby significantly reduced.

대표청구항 ▼

[ I claim:] [6.] A noise attenuation apparatus for use in a motor vehicle having a passenger compartment, said noise attenuation apparatus comprising:a moveable side glass resiliently supported from within door of the motor vehicle, said side glass having a lower portion of said glass, and an upper

[ I claim:] [6.] A noise attenuation apparatus for use in a motor vehicle having a passenger compartment, said noise attenuation apparatus comprising:a moveable side glass resiliently supported from within door of the motor vehicle, said side glass having a lower portion of said glass, and an upper portion of said glass protruding above a beltline and an interior surface exposed to the passenger compartment, and an exterior surface exposed to an exterior surrounding the motor vehicle;sensor means for sensing vibrations of said side glass and generating a vibration signal corresponding thereto;control means for generating an attenuation signal corresponding to said vibration signal; andactuation means for vibrating said side glass in response to said attenuation signal so as to cancel said vibrations of said side glass thereby reducing noise radiated from said side glass.