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KMID : 0858620050090020175
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Korean Journal of Audiology
2005 Volume.9 No. 2 p.175 ~ p.179
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A Study of the Occlusion Effect for Completely-in-the-canal Hearing Aids as a Function of the Vent Length and Residual Volume
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Lee Sang-Yeon
Lee Kyoung-won
Lee Jung-Hak
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Abstract
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The purpose of this study was to investigate the acoustic effects of five different configurations with respect to the vent length and residual volume of completely-in-the-canal (CIC) hearing aids. Twelve normal-hearing listeners were tested with the CIC dummy with the paralel vent of 0.8 mm diameter and 18 mm length. For all venting systems, the real ear insertion gain (REIG) were measured for estimating the occlusion effect using a probe microphone system. The self-phonated closed vowel ’ee’ at 80±3 dB SPL was used for the stimulus which was calibrated by the sound level meter at the distance of 30 cm from each subject. The results showed that, although the usefulness of a small vent is well known for the static pressure equalization, the 0.8 mm vent with 18 mm length didn’t show significant differences in the REIG for CIC hearing aids. In addition, the REIG was reduced at low and middle frequencies for CIC hearing aids with the vent with 13 mm length and increased residual volume. These results suggest that, in CIC hearing aids, occlusion effect be reduced with a shorter vent and larger residual volume.
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KEYWORD
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Occlusion effect, Real ear insertion gain (REIG), Vent, Residual volume, Completely-in-the-canal (CIC) hearing aids
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