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Extended bandwidth real-ear measurement accuracy and repeatability to 10 kHz
Jonathan M Vaisberg1,2, Ewan A Macpherson1,3, Susan D Scollie1,3
1a National Centre for Audiology, Western University , London , Ontario , Canada .
International Journal of Audiology
|July 2, 2016
Summary
Accurate real-ear measurements up to 8 kHz are achievable with a 28 mm probe tube insertion depth. This depth reliably predicts sound levels and offers clinical feasibility for audiological assessments.
Area of Science:
- Audiology
- Acoustics
- Hearing Science
Background:
- Direct real-ear measurements are crucial for accurate hearing aid fitting.
- Current methods often have limitations in extended frequency ranges.
Purpose of the Study:
- To evaluate the accuracy and repeatability of extended bandwidth real-ear measurements.
- To assess the impact of signal analysis bandwidth on measurement outcomes.
Main Methods:
- White noise was measured in 14 female adults with normal hearing.
- Measurements were taken at four insertion depths using 1/3 and 1/24 octave band averaging.
- Narrowband and wideband signal analyses were employed.
Main Results:
- Test-retest differences were within ±2 dB for typical clinical bandwidths and insertion depths.
- Measurements up to 8 kHz were accurate at a 30 mm insertion depth.
- A 28 mm insertion depth accurately predicted ear canal levels at 30 mm and extended reliably to 8 kHz.
Conclusions:
- A 28 mm probe tube insertion depth provides clinically feasible and accurate real-ear measurements up to 8 kHz.
- This insertion depth reliably predicts sound levels up to 10 kHz.
- Signal analysis bandwidth (1/3 vs. 1/24 octave) did not significantly affect accuracy or repeatability.
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