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In-the-Ear Measurements of Interference in Hearing Aids from Digital Wireless Telephones

机译：数位无线电话助听器的耳内干扰测量

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摘要

Digital wireless telephones produce audible and often annoying interference in hearing aids. A standard, ANSI C.63.19, has been developed for measuring electromagnetic emissions from wireless telephone handsets as well as immunity in hearing aids. Based on the test results for a handset and a hearing aid, an estimated prediction of usability for that combination of devices can be made. One question that arose during the development of the standard was the acoustic signal-to-interference ratio (SIR) requirements for various levels of telephone usability as rated by hearing aid wearers. An experiment was conducted in which 42 hearing aid wearers listened to a telephone conversation through a dummy wireless phone while interference levels were varied using a second phone programmed to deliver a controlled electromagnetic field. Real-ear recordings of the speech with interference were made at each rating point of usability. Signal analyses of the recordings indicate that for 90% of the subjects, SIRs in the 28- to 32-dB range were needed to achieve a rating of Highly Usable, SIRs in the 20- to 24-dB range were needed for a rating of Minor Limitations on Use, and SIRs in the 12- to 15-dB range were needed for a rating of Major Limitations on Use.
机译：数字无线电话在助听器中产生听得见且通常令人讨厌的干扰。已经开发了用于测量无线电话手机的电磁辐射以及助听器抗扰度的ANSI C.63.19标准。根据手机和助听器的测试结果，可以估算出该设备组合的可用性。在标准制定过程中出现的一个问题是助听器佩戴者对各种电话可用性级别的声信号干扰比（SIR）要求。进行了一项实验，其中42位助听器佩戴者通过虚拟无线电话收听了电话交谈，同时使用编程为传递受控电磁场的第二个电话来改变干扰水平。在可用性的每个评估点上都会录制带有干扰的语音的实耳录音。记录的信号分析表明，对于90％的受试者，需要达到28至32 dB范围的SIR才能达到“高度可用”的等级，需要达到20至24 dB范围的SIR才能达到“高可用性”的等级。要对主要使用限制进行评级，就需要使用次要限制，以及12至15 dB范围内的SIR。

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