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KMID : 0858620040080020125
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Korean Journal of Audiology
2004 Volume.8 No. 2 p.125 ~ p.132
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A Study for the Features of Masked Pure Tone Threshold Using TEN(Threshold Equalizing Noise)
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Lim Kyung-Su
Lee Jung-Hak
Ku Ho-Lim
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Abstract
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The purpose of this study was to examine the features of masked pure tone thresholds using threshold equalizing noise (TEN). We obtained the data from 24 ears of 12 adults (8 males and 4 females) with normal hearing. The average hearing thresholds of subjects were below 5 dB HL. The new version of TEN HL Test was conducted at the levels of 40 dB/ERBN, 60 dB/ERBN and 80 dB/ERBN. The new version of TEN HL TEST has several advantages. First, we use dB HL for all levels so absolute thresholds can be measured at once. Second, the Noise level/ERB and the level of sound for test have the same value at audiometer as the calibration has been done perfectly. This helps to use the TEN HL Test easily and the possibility of occurring error is reduced. Third, the bandwidth of noise has been reduced from 250-10,000 Hz (11 frequency region) to 500-4,000 Hz (7 frequency region) and the noise crest factor has become very low. Consequently, we can avoid excess sound distortion as the noise level/ERB and the possibility of defection of hearing are increased. Masked pure tone thresholds increased as TEN levels went up. The masked levels were not significantly different from the TEN levels, however, for all experimental conditions. These results suggest that the new version of TEN HL test be reliable. Thus, the TEN test may be applied for evaluating the damaged region of cochlea and also for prescribing and fitting hearing aids with further study. More data for hearing-impaired people should be obtained before clinical use.
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KEYWORD
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Dead region, Cochlear hearing loss, Threshold equalizing noise
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