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KMID : 0858620040080020104
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Korean Journal of Audiology
2004 Volume.8 No. 2 p.104 ~ p.108
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Effects of the Vent and Filter of In-The-Canal(ITC) Hearing Aid on the Insertion Gain for the Closed Vowel "ee"
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Kim Min-Hee
Cho Chang-Gun
Lee Jung-Hak
Lee Kyoung-won
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Abstract
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When hearing-impaired people wear hearing aids, they often complain of occlusion or feedback. The purpose of this study was to find out the effects of vent and filter of in-the-canal (ITC) hearing aids on the insertion gain. Subjects consisted of 16 adults with normal hearing. The vent of 1.13 mm diameter and acoustic filters of 680 Ω and 2200 Ω were used for the experiment. The self-phonated closed vowel "ee" at 80 dB SPL was used for the stimulus which was calibrated by the B&K sound level meter at the distance of 30 cm from each subject. The results of this study were as follows：First, the differences between the sound pressure levels (SPLs) checked using vent-closed and vent-open ITC hearing aids were significant at 250 Hz and 500 Hz (p<.01). Second, the SPLs of the vent-closed ITC were significantly different from the SPLs of the ITC with the vent containing acoustic filter of 680 Ω at 250 Hz and 750 Hz (p<.01). Third, comparing the vent-closed ITC with the vent-open ITC with acoustic filter of 2200 Ω, the SPLs demonstrated significant differences at 750 Hz, 1 kHz and 1.5 kHz (p<.01)；for the vent-open and the vent with acoustic filter of 2200 Ω, the differences were significant at 1.5 kHz and 2 kHz (p<.01). These results indicate that 1.13 mm vent at ITC hearing aids is effective for allevi-ate occlusion effect and that the acoustic filter of 2200 Ω is more appropriate for alleviate occlusion effect and feedback than acoustic filter of 680 Ω.
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KEYWORD
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Occlusion effect, Vent, In-the-canal (ITC) hearing aids, Insertion gain, Acoustic filter
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