| 摘要 |
A loudspeaker comprises an acoustic radiator (10) (e.g., a panel) capable of supporting bending waves, an exciter mounted on the acoustic radiator (10,28) to excite bending waves in the acoustic radiator (10,28) to produce an acoustic output, and a filter (12,30) located adjacent to the acoustic radiator (10,28) for directing the acoustic output from the acoustic radiator (10,28). The filter (12,30) is adapted to have a pattern (11) of varying acoustic absorbency, the pattern (11) being selected to produce a desired directivity of the acoustic output. The filter (12,30) may be in the form of an acoustic mask comprising a pattern (11) of at least one acoustic aperture (14,16).
|
