Reference Equivalent Threshold Force Levels for Speech in Three Types of Audiometric Bone Conduction Receivers

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  • 骨導語音聴覚検査の基準レベルの検討

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Abstract

The reference equivalent threshold force level (RETFL) for Japanese bone conduction speech audiometry has not been reported, and the tentative recommendation in the JIS T1201-2 (2000) is 6dB different from the international reference specified in IEC60645-2 (1993). To examine the validity of the Japanese standard, the vibratoy force levels of three types of audiometric bone conduction receivers corresponding to the mean speech recognition threshold for single digits included in the 67-S Japanese speech audiometric test were measured in 20 otologically normal listeners. And then compared with the RETFLs in both standards. Although each of the three levels was within 2.5dB of the recommended RETFL for speech in the JIS T1201-2, statistically significant interreceiver differences existed up to 4dB. These differences were considered to originate primarily from inter-receiver differences in frequency response and, for one receiver, from sound radiation from the bone vibrator. These findings indicate that the RETFL for speech must be determined for individual receivers in instances where the frequency response of the bone conduction receiver is not specified.

Journal

  • AUDIOLOGY JAPAN

    AUDIOLOGY JAPAN 47 (4), 228-233, 2004

    Japan Audiological Society

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