| 摘要 |
An acoustic apparatus includes a vibration part (10) configured to generate an acoustic vibration, a tube (20) having a cavity that faces the vibration part (10), and at least one open tube (21, 22) connected to the tube (20) via a first open end (21a, 22a) and a second open end (21b, 22b). A length of the at least one open tube (21, 22) is an integer-fold of substantially a half of a wavelength of a standing wave produced in the tube (20). The first open end (21a, 22a) is positioned substantially at an anti-node of the standing wave produced in the tube (20). |
