| 摘要 |
<p>[PROBLEMS] To provide a sound absorbing structure capable of preventing sound wave in a wide band from leaking to the outside by absorbing it, reproducing an intended undertone in a restricted room, and preventing noise from occurring. [MEANS FOR SOLVING PROBLEMS] This sound absorbing structure comprises a sound channel formed of wall surfaces and allowing sound wave to pass therethrough. The sound channel comprises a constricted part, in its cross section, so formed that the rate of decrease of its area is gradually decreased at least on its inlet side.</p> |
