| 摘要 |
The enclosure (80) has an element (84) e.g. loudspeaker, for generating acoustic waves towards front of a wall (82). A cavity (86) is equipped with an opening (86a). The cavity originates stationary acoustic wave based on acoustic waves generated by the element, where the stationary acoustic wave has a resonant frequency that comprises a range of frequency of acoustic waves generated by the element. An acoustic absorption unit (88) has acoustic absorption at the resonant frequency or around the resonant frequency. |
