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Directional microphone effects on measurement of the HINT.

机译：定向麦克风会影响提示的测量。

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摘要

Directional microphones are one of the few solutions available to improve the signal-to-noise ratio (SNR) in noisy environments for listeners with hearing loss. In addition to changes in SNR, directional hearing aids have a characteristic +6 dB per octave low frequency reduction in gain compared to omnidirectional hearing aids. (Killion et al., 1998) These gain reductions are sometimes compensated through a low frequency gain boost during the hearing aid fitting process. This research examined the effect of directional microphone equalization on sentence intelligibility in noise.; Digital recordings were mastered through a directional and omnidirectional microphone mounted in a full shell hearing aid case worn by the author, who was positioned in a sound field between four loudspeakers. Sentences from the Hearing In Noise Test (HINT) were delivered from a front loudspeaker (0 degrees) while the speech noise portion was delivered from three loudspeakers positioned at 90, 180, and 270 degrees. The speech level was presented for each HINT sentence at a constant level (65 dB SPL), while the competing noise was varied in 2 dB steps from −10 to +10 dB SNR. Digital sound recordings were made for omnidirectional, directional, and frequency-response equalized directional microphones with multiple sentences recorded at each SNR. These recordings were mastered to three CD-R disks, one for each microphone configuration. The audio output was passed through a +6 dB/octave high pass filter before being fed to a clinical audiometer in order to provide some frequency shaping for the subjects' hearing losses. A 20-sentence HINT was administered using each CD-R as the source through a clinical audiometer into one ear of 10 subjects, each having a similar high frequency hearing loss in the tested ear. SNR scores were thus obtained for each subject in all three microphone configurations.; Results showed that subjects performed 3.5 dB more poorly on the HINT when tested by the omnidirectional recordings than with the directional recordings. No statistical differences were present between the unequalized and equalized directional test results. Therefore, the use of gain equalization in clinical fittings for patients with near normal low frequency hearing is not recommended. Low frequency gain compensation is not suggested for patients with low frequency hearing thresholds falling in the moderate range or better.
机译：定向麦克风是可用于在嘈杂环境中为有听力损失的听众提高信噪比（SNR）的少数解决方案之一。除了SNR的变化外，定向助听器与全向助听器相比还具有每倍频程+6 dB的低频增益降低特性。 （Killion等，1998）在助听器安装过程中，有时会通过低频增益提升来补偿这些增益降低。本研究考察了定向麦克风均衡对噪声中句子清晰度的影响。数字录音通过安装在作者佩戴的全壳助听器外壳中的定向和全向麦克风进行控制，作者将其放置在四个扬声器之间的声场中。听力噪声测试（HINT）的句子是从前置扬声器（0度）发出的，而语音噪声部分是从位于90、180和270度的三个扬声器发出的。每个HINT句子的语音级别都以恒定级别（65 dB SPL）呈现，而竞争性噪声则以-10 dB到+10 dB SNR的2 dB步长变化。为全向，定向和频率响应均衡的定向麦克风制作了数字录音，并在每个SNR上记录了多个句子。这些录音被母带到三个CD-R磁盘，每个麦克风配置一个。音频输出通过+6 dB /倍频程高通滤波器后再送入临床听力计，以便为受试者的听力损失提供一定的频率整形。通过临床听力计，使用每种CD-R作为来源，将20句的HINT注射到10位受试者的一只耳朵中，每名受试者的被测耳朵都有类似的高频听力损失。这样就获得了所有三种麦克风配置中每个受试者的SNR分数。结果表明，与全向录音相比，通过全向录音进行测试时，受试者在HINT上的表现要差3.5 dB。在不均衡和均衡的定向测试结果之间没有统计差异。因此，不建议在接近正常的低频听力的患者的临床验配中使用增益均衡。对于低频听力阈值在中等范围或更佳范围内的患者，不建议使用低频增益补偿。

著录项

  • 作者

    Kayser, Dean Joel.;

  • 作者单位

    Central Michigan University.;

  • 授予单位 Central Michigan University.;
  • 学科 Health Sciences Audiology.
  • 学位 Au.D.
  • 年度 2002
  • 页码 29 p.
  • 总页数 29
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 耳科学、耳疾病;
  • 关键词

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