| 摘要 |
<p>A substantially enclosed sound absorbing unit (21) for an anechoic chamber is disclosed. The sound absorbing unit (12) includes a substantially flat panel member (25) comprising a layer of sound absorptive material. An anechoic member (21) is disposed adjacent to the flat panel member (25). The anechoic member (21) is disposed adjacent to a base (29) and a generally spaced apart sound transparent wall member (26). The wall member (26) includes a layer of sound absorptive material (27) and a cover sheet (20) made of perforated, substantially sound reflective material. The free space (30) of the perforated cover sheet (20) is at least 7 percent of the total area of the cover sheet (20).</p> |
