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首页> 美国卫生研究院文献>The Journal of the Acoustical Society of America >Specification of absorbed-sound power in the ear canal: Application to suppression of stimulus frequency otoacoustic emissions
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Specification of absorbed-sound power in the ear canal: Application to suppression of stimulus frequency otoacoustic emissions

机译：耳道吸收声功率的规范：在抑制刺激频率耳声发射中的应用

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摘要

An insert ear-canal probe including sound source and microphone can deliver a calibrated sound power level to the ear. The aural power absorbed is proportional to the product of mean-squared forward pressure, ear-canal area, and absorbance, in which the sound field is represented using forward (reverse) waves traveling toward (away from) the eardrum. Forward pressure is composed of incident pressure and its multiple internal reflections between eardrum and probe. Based on a database of measurements in normal-hearing adults from 0.22 to 8 kHz, the transfer-function level of forward relative to incident pressure is boosted below 0.7 kHz and within 4 dB above. The level of forward relative to total pressure is maximal close to 4 kHz with wide variability across ears. A spectrally flat incident-pressure level across frequency produces a nearly flat absorbed power level, in contrast to 19 dB changes in pressure level. Calibrating an ear-canal sound source based on absorbed power may be useful in audiological and research applications. Specifying the tip-to-tail level difference of the suppression tuning curve of stimulus frequency otoacoustic emissions in terms of absorbed power reveals increased cochlear gain at 8 kHz relative to the level difference measured using total pressure.
机译：包括声源和麦克风的插入式耳道探头可将校准后的声功率水平传递到耳朵。所吸收的听觉功率与均方正向压力，耳道面积和吸光度的乘积成正比，其中声场是使用朝（远离）鼓膜传播的正向（反向）波表示的。前向压力由入射压力及其在鼓膜和探头之间的多次内部反射组成。根据正常听觉成年人从0.22到8 kHz的测量数据库，正向传递函数相对于入射压力的传递水平被提高到0.7 kHz以下和4 dB以内。相对于总压力的正向水平最大接近4 kHz，并且整个耳朵的变化很大。与压力水平的19 dB变化相比，整个频率上频谱上平坦的入射压力水平产生了几乎平坦的吸收功率水平。基于吸收的功率来校准耳道声源在听力学和研究应用中可能很有用。以吸收功率为单位指定刺激频率耳声发射的抑制调谐曲线的点到尾水平差，表明相对于使用总压力测得的水平差，在8 kHz时耳蜗增益增加。

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