| 摘要 |
<p>A portable apparatus (100, 200, 300) including a main body (110) and a receiver (120) is provided. The main body (110) has a surface (110a), an active sound hole (110b, 210b, 310b) and a passive sound hole (110c, 210c, 310c). The active sound hole (110b, 210b, 310b) and the passive sound hole (110c, 210c, 310c) are both disposed at the surface (110a) of the main body (110). The receiver (120) is disposed inside the main body (110) and arranged for emitting a first sound wave (W1) and a second sound wave (W2) with the same amplitude and frequency but opposite transmission directions. The first sound wave (W1) is transmitted out of the main body (110) via the active sound hole (110b, 210b, 310b) and the second sound wave (W2) is guided in the main body (110) and transmitted out of the main body (110) via the passive sound hole (110c, 210c, 310c).</p> |
