SOUND GENERATOR FOR AN ANTI-NOISE SYSTEM FOR INFLUENCING EXHAUST NOISES AND/OR INTAKE NOISES OF A MOTOR VEHICLE

摘要

A sound generator for influencing sound waves propagating in exhaust or intake systems of combustion engine driven vehicles includes: an enclosure having a port opening for communication with an exhaust and/or intake system; a loudspeaker basket supported by the enclosure; a membrane and a permanent magnet supported by the loudspeaker basket; and a voice coil supported by a voice coil carrier. The voice coil is disposed in a constant magnetic field created by the permanent magnet and is connected to the membrane. The membrane is located between the port opening and the permanent magnet. The membrane is funnel-like or dome-like, with the top or top face of the funnel-like membrane or the geometric center of the dome-like membrane facing away from the permanent magnet. An anti-noise system using the sound generator, and a vehicle using the anti-noise system are also provided.

主权项

1. A sound generator for an anti-noise system for influencing sound waves propagating in exhaust systems or intake systems of vehicles driven by an internal combustion engine, the sound generator comprising:
an enclosure having a port opening for a fluid communication with an exhaust system or an intake system; a loudspeaker basket supported by the enclosure; a permanent magnet supported by the loudspeaker basket; a voice coil supported by a voice coil carrier, the voice coil being disposed in a constant magnetic field created by the permanent magnet; and a membrane supported by the loudspeaker basket and connected to the voice coil, the membrane being located between the port opening of the enclosure and the permanent magnet, the membrane having an axial extent from a membrane base to a membrane top, and having a base radial dimension that is larger than a top radial dimension with the membrane top being spaced away, in an axial direction, from the permanent magnet a greater distance than the membrane base.