什么是助听器的频响特性?

2025-03-14 23:40:35
推荐回答(2个)
回答1:

频响曲线是将音量设置在参考测试增益,并给予60db的输入声压级,得到一条输出与频率的函数关系曲线。具有AGC功能的助听器则是将音量开到最大给予50db输入声压级所描绘的频响曲线。
助听器的频率范围指的是助听器能够有效放大声音信号的频段。其声学测量方法是在基本频响曲线上,将1kHz、1.6kHz、2.5kHz三个频率所对应的增益的平均值下移20 dB做一水平横线,该线与基本频响曲线的两个交点,分别为助听器有效放大频段的低频线和高频线。它是衡量助听器质量的一项重要指标,一般助听器的频率范围至少应在300-3000Hz.好的助听器的频率范围可达80-8000Hz。

回答2:

频响(frequency response)指助听器输出增益变化随输入信号频率变化的函数关系,表述为频响曲线或频宽。
就耳聋而言,有些高频损失多,里陡降型;有些低频损失多,呈上升型。相应地,有些助听器高频增益多;另一些则低频增益多。助听器的频响特性既代表了不同助听器所具有的不同频响特点,也适应了不同听力损失人群对频率的不同需要。

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