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助听器通气孔的作用 - 上海助听器-瑞士峰力助听器验配服务中心5折起

助听器通气孔的作用

助听器的通气孔是为了改变助听器的频响,即使通气孔很小,也能缓解耳内胀满感,减轻耳内压力,保持耳道与外界的通风,耳道通风可减少耳内X。

减轻堵耳效应,堵耳效应可使病人觉得自己说话声音很响、很空,像闷在桶里说话一样,这是因为耳道堵塞后,病人自己的说话声可通过骨导作用使低频声增强。

减少低频增益,低频减少的程度可随着通气孔直径的增加而增加,定制耳膜时,除重度耳聋外,一般都需要定制通气孔,如果不需要的话,也可将通气孔堵塞。

通气孔的大小主要取决于啸叫与堵耳的平衡问题以及耳道的大小,啸叫是由于放大的声音又回到麦克风,在某一个频率上引起了共振,于是产生出可听到的啸叫声,即使这种声音听不见,也是失真的放大声音,通气孔增大,会使啸叫发生的可能性增加。

通气孔的声学效应主要是减小助听器的低频效应,因其管道的长度和直径不同,可使助听器产生不同的低频衰减量。

一个合适的通气孔不仅可以提高助听器佩戴的舒适度,还可以改善音乐,相反,若通气孔不合适,将会使助听器产生反馈啸叫,从而导致用户拒绝使用助听器。

助听器通气孔的作用

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