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for export wireless portable voice auxiliary hearing device for the elderly

专供出口 无线便捷式老人声音辅听器

  • EXW Price: Min. order:
    ¥38.0
    ≥100/piece
  • 100 piece
  • Exchage Rate 1 CNY ≈ 0.1418 USD
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  • Description
所有电子辅听器的工作原理是一样的。任何辅听器都包括6个基本结构。1.话筒(传声器或麦克风)接收声音并把它转化为电波形式,即把声能转化为电能。2.放大器放大电信号(晶体管放大线路)3.耳机(受话器)把电信号转化为声信号(即把电能转化为声能)。4.耳模(耳塞)置入外耳道。5.音量控制开关6.电源供放大器用的电池。助听器除有上述6部件外,大多数型号的助听器还有3个附件,或称3个附加电路(音调控制、感应线圈、输出限制控制)。现代电子助听器是一放大器,它的功能是增加声能强度并尽可能不失真地传入耳内。因声音的声能不能直接放大,故有必要将其转换为电信号,放大后再转换为声能。输入换能器由传声器(麦克风或话筒)、磁感线圈等部分组成。其作用是将输入声能转为电能传至放大器。放大器将输入电信号放大后,再传至输出换能器。输出换能器由耳机或骨导振动器构成,其作用是把放大的信号由电能再转为声能或动能输出。电源是供给助听器工作能量不可缺少的部分,另外还设有削峰(PC)或自动增益控制(AGC)装置,以适合各种不同程度耳聋病人的需要。

Update time:20240418110855


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