| 摘要 |
The present object is concerned with an hollow construction block (1), intended specially for domestic acoustic studios, wholly cancelling the propagation of sound and also blocking the entrance of sounds from outside sources. Vacuum (9) is made by the absence of air inside the block (1), formed by upper (6), lower (7), side (2, 3), front (4) and rear walls (5), avoiding thus the propagation of sound. |
