| 摘要 |
A transducer arrangement for active noise cancellation in conduits, for example in motor vehicles comprising an enclosed chamber partitioned to expose a first transducer side to a first chamber portion (34) and a second transducer side to a second chamber portion (36). A first port (39) couples one of the chambers (34, 36) to the other and a second port (41) couples one of the chambers to the conduit (14). Each port for communicating with the conduit can be tuned to resonate at predetermined frequencies. When both sides of the transducer are so coupled to the conduit, the transducer has increased efficiency over a band of frequencies, to accommodate the frequencies generated by a source of noise while limiting access of fluid or heat in the conduit to the transducer. A transducer arrangement according to the present invention reduces vibration of the housing. The system is particularly suitable for use in adapting noise cancellation techniques to replace or combine with passive mufflers on motor vehicles. |
