| 摘要 |
<p>A headset for use on an aircraft has a pair of earpieces (12A, 12B) on a resilient headband (22) which can hold resilient annular seals (16A, 16B) in contact with the wearer's head to give a firm seal. A drive motor (38) provides slightly pressurised air to inner chambers (18A, 18B) of the earpieces (12) via a non-kink tube (26) and the headband (22) which is hollow, the supply of pressurised air being arranged so that the change of pressure within the inner chambers (18) occurs at a slower rate than in the aircraft cabin. The rate of change can be controlled manually by a rotary control knob (34). A slider switch (32) allows the user to select pressurised air in accordance with take-off or landing of the aircraft. The headset may also have loudspeakers and microphones within the earpieces.</p> |
