| 摘要 |
<p>A circumaural noise reduction headset earcup 58 has, an enclosure 12 with walls separating an interior of said enclosure from the exterior of the earcup 58. A driver 18 with a diaphragm 21 is provided. A port 16 connects the interior and the exterior of the earcup 58, and has a mass that coacts with the compliance of the enclosure 12 to establish a resonant circuit having a resonance at a resonant frequency. An acoustically resistive opening 17 connects the interior and the exterior of said earcup 58 in parallel with the port 16. <IMAGE></p> |
