- 著者
- Kaoru Ashihara Kenji Kurakata Tazu Mizunami Kazuma Matsushita
- 出版者
- 一般社団法人 日本音響学会
- 雑誌
- Acoustical Science and Technology (ISSN:13463969)
- 巻号頁・発行日
- vol.27, no.1, pp.12-19, 2006 (Released:2006-01-01)
- 参考文献数
- 25
- 被引用文献数
- 10 27
Hearing thresholds for pure tones from 2 kHz to 28 kHz were measured. A 2AFC procedure combined with a 3-down 1-up transformed up-down method was employed to obtain threshold values that were less affected by listener’s criterion of judgment. From some listeners, threshold values of 88 dB SPL or higher were obtained for a tone at 24 kHz, whereas thresholds could not be obtained from all participants at 26 kHz and above. Furthermore, thresholds were also measured under masking by a noise low-pass filtered at 20 kHz. At frequencies above 20 kHz, the difference of threshold values between with and without the masking noise was a few decibels, indicating that the tone detection was not affected by subharmonic components that might have appeared in the lower frequency regions. The results of measurement also showed that the threshold increased rather gradually for tones from 20 to 24 kHz whereas it increased sharply from 14 to 20 kHz.
- 著者
- Kaoru Ashihara
- 出版者
- ACOUSTICAL SOCIETY OF JAPAN
- 雑誌
- Acoustical Science and Technology (ISSN:13463969)
- 巻号頁・発行日
- vol.27, no.6, pp.332-335, 2006 (Released:2006-11-01)
- 参考文献数
- 14
When two or more tones are presented simultaneously, a listener can sometimes hear other tones that are not present. These other tones called ‘combination tones’ are thought to be induced by nonlinear activities in the inner ear. It is difficult to demonstrate this phenomenon because a listener cannot easily distinguish combination tones from primary tones. This paper introduces a unique method called the ‘sweep tone method’ by which combination tones can be perceptually distinguished from primary tones relatively easily. The importance of the non-linear characteristics of the intact auditory system is described.