| 摘要 |
This invention relates to an acoustic board and in particular to one which includes a framework, a front panel formed with a plurality of larger openings and smaller openings and fitted on one side of the framework, a rear panel fitted on another side of said framework thereby forming a space between the front panel and the rear panel, a plurality of sound collecting cylinders having an open front end and a closed second end and each fitted within respective larger openings of the front panel and having the open end aligned with the larger openings of the front panel, and a plurality of silencers formed with a plurality of elongated perforations and extended through and supported in an opening provided in the second end of the sound collecting cylinder.
|
