NIST System for Measuring the Directivity Index of Hearing Aids under Simulated Real-Ear Conditions.

IF 1.5 4区 工程技术
Randall P Wagner
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引用次数: 1

Abstract

The directivity index is a parameter that is commonly used to characterize the performance of directional hearing aids, and is determined from the measured directional response. Since this response is different for a hearing aid worn on a person as compared to when it is in a free field, directivity index measurements of hearing aids are usually done under simulated real-ear conditions. Details are provided regarding the NIST system for measuring the hearing aid directivity index under these conditions and how this system is used to implement a standardized procedure for performing such measurements. This procedure involves a sampling method that utilizes sound source locations distributed in a semi-aligned zone array on an imaginary spherical surface surrounding a standardized acoustical test manikin. The capabilities of the system were demonstrated over the frequency range of one-third-octave bands with center frequencies from 200 Hz to 8000 Hz through NIST participation in an interlaboratory comparison. This comparison was conducted between eight different laboratories of members of Working Group S3/WG48, Hearing Aids, established by Accredited Standards Committee S3, Bioacoustics, which is administered by the Acoustical Society of America and accredited by the American National Standards Institute. Directivity measurements were made for a total of six programmed memories in two different hearing aids and for the unaided manikin with the manikin right pinna accompanying the aids. Omnidirectional, cardioid, and bidirectional response patterns were measured. Results are presented comparing the NIST data with the reference values calculated from the data reported by all participating laboratories.

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NIST模拟实耳条件下助听器指向性指数测量系统。
指向性指数是指向性助听器常用的性能表征参数,由测量的指向性响应确定。由于戴在人身上的助听器与在自由场中的助听器的反应是不同的,助听器的指向性指数测量通常是在模拟的实耳条件下进行的。详细介绍了在这些条件下用于测量助听器指向性指数的NIST系统,以及如何使用该系统来实施执行此类测量的标准化程序。该程序涉及一种采样方法,该方法利用分布在围绕标准化声学测试人体的假想球面上的半对准区阵列中的声源位置。通过NIST参与的实验室间比较,在中心频率从200 Hz到8000hz的三分之一倍频频带的频率范围内展示了该系统的能力。这项比较是在S3/WG48助听器工作组成员的8个不同实验室之间进行的,该工作组由S3生物声学认可标准委员会建立,由美国声学学会管理,并由美国国家标准协会认可。在两种不同的助听器中,以及在没有辅助的人体模型的情况下,对人体模型的右耳廓进行了指向性测量。测量全向、心向和双向反应模式。结果将NIST的数据与所有参与实验室报告的数据计算的参考值进行比较。
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来源期刊
自引率
33.30%
发文量
10
期刊介绍: The Journal of Research of the National Institute of Standards and Technology is the flagship publication of the National Institute of Standards and Technology. It has been published under various titles and forms since 1904, with its roots as Scientific Papers issued as the Bulletin of the Bureau of Standards. In 1928, the Scientific Papers were combined with Technologic Papers, which reported results of investigations of material and methods of testing. This new publication was titled the Bureau of Standards Journal of Research. The Journal of Research of NIST reports NIST research and development in metrology and related fields of physical science, engineering, applied mathematics, statistics, biotechnology, information technology.
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