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数字信号处理技术为助听器制造商解决了难题 - China Medical Device Manufacturer
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Fri, January 19th, 2018

2007 夏季刊 » 技术新知
数字信号处理技术为助听器制造商解决了难题

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集成数字信号处理器的5900系列可为助听器提供高精度的声音。
用户常常抱怨助听器的舒适度欠佳,不够美观以及效果不够好。AMI半导体公司(美国爱达荷州,Pocatello;www.amis.com)的目标是协助数码助听器生产商克服这些缺点,使助听器变得舒适好用。此公司目前提供一系列开放可编程的集成数字信号处理器(DSP; digital signal processors,数字信号处理器),据称可以通过高精度的计算能力提供高精度的声音。

根据公司表示,随着语言和听觉的处理演算系统的复杂化、智能化, Ezairo5900系列的精度能允许更复杂的算法,增加处理空间和灵活性,并且只有很低限度的群时延。

公司声称,Ezairo DSP的24位声音处理系统还可以使目前的先进助听器系统运算效能更高。新功能包括:自适应噪音抑制,这可以帮助用户在嘈杂的环境中理解语意;自适应波束形成,可以帮助用户更好的获取某个方向的声音,这意味着用户可以听到关注方向的声音,而不受背景噪音的干扰。背景噪音是目前助听器用户抱怨最多的问题。

EzairoDSP在耗电很少的情况下,可提供最高90分贝的声音,其满负荷运行的电流为1mA。公司采用了反馈补偿演算系统,以配合越来越流行但耗电较多的耳背式助听器。耳背式助听器同时考虑到了美观和舒适的问题。助听器的一部分(包括DSP)与耳朵紧贴并位于耳后,一个小型透明导管接头伸入耳内。这种耳背式助听器更为隐蔽,并且避免了将大型部件伸入耳内,增加了佩戴的舒适度,也降低了堵耳效应。

Ezairo 5900系列提供4个供麦克风、拾音线圈以及直接音频输入使用的并行接口。音频输入口将使未来的助听器可与音乐播放器相连接。


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