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An examination of the effects of broadband air-conduction masker on the speech intelligibility of speech-modulated bone-conduction ultrasound.
Hear Res. 2014 Nov; 317:41-9.HR

Abstract

Ultrasound can be heard by bone-conduction, and speech-modulated bone-conducted ultrasound (BCU) delivers the speech information to the human ear. One of the recognition mechanisms is the demodulation of the signals. Because some of the profoundly deaf can also hear speech-modulated BCU, another mechanism may also contribution to the recognition of speech-modulated BCU. In this study, eight volunteers with normal hearing participated. The intelligibilities of speech-modulated BCU were measured using a numeral word list under masking conditions. Because the masker can mask the demodulated sounds, the evaluation of the masking reveals the contribution of the demodulation to the recognition of speech-modulated BCU. In the current results, the masking of speech-modulated BCU differed from that of original non-modulated speech. Although the masking shifted the recognition curve for the original speech upward, the same results were not observed for the speech-modulated BCU. The masking generated the difference in the correct answers among the words for the speech-modulated BCU. The current results suggested the importance of the envelope of the modulated ultrasonic signal to the recognition under masking condition. Both demodulation and direct ultrasonic stimulation contribute to the recognition of speech-modulated BCU for the normal hearing individuals, and the direct ultrasonic stimulation plays an important role in the recognition for the profoundly deaf.

Authors+Show Affiliations

Department of Otolaryngology - Head & Neck Surgery, Nara Medical University, 840 Shijo-cho Kashihara, Nara 634-8522, Japan. Electronic address: t-nishim@naramed-u.ac.jp.Department of Otolaryngology - Head & Neck Surgery, Nara Medical University, 840 Shijo-cho Kashihara, Nara 634-8522, Japan.Department of Otolaryngology - Head & Neck Surgery, Nara Medical University, 840 Shijo-cho Kashihara, Nara 634-8522, Japan.Department of Otolaryngology - Head & Neck Surgery, Nara Medical University, 840 Shijo-cho Kashihara, Nara 634-8522, Japan.Department of Otolaryngology - Head & Neck Surgery, Nara Medical University, 840 Shijo-cho Kashihara, Nara 634-8522, Japan.Department of Otolaryngology - Head & Neck Surgery, Nara Medical University, 840 Shijo-cho Kashihara, Nara 634-8522, Japan.Nara Medical University, 840 Shijo-cho Kashihara, Nara 634-8522, Japan.Department of Otolaryngology - Head & Neck Surgery, Nara Medical University, 840 Shijo-cho Kashihara, Nara 634-8522, Japan.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

25285623

Citation

Nishimura, Tadashi, et al. "An Examination of the Effects of Broadband Air-conduction Masker On the Speech Intelligibility of Speech-modulated Bone-conduction Ultrasound." Hearing Research, vol. 317, 2014, pp. 41-9.
Nishimura T, Okayasu T, Saito O, et al. An examination of the effects of broadband air-conduction masker on the speech intelligibility of speech-modulated bone-conduction ultrasound. Hear Res. 2014;317:41-9.
Nishimura, T., Okayasu, T., Saito, O., Shimokura, R., Yamashita, A., Yamanaka, T., Hosoi, H., & Kitahara, T. (2014). An examination of the effects of broadband air-conduction masker on the speech intelligibility of speech-modulated bone-conduction ultrasound. Hearing Research, 317, 41-9. https://doi.org/10.1016/j.heares.2014.09.012
Nishimura T, et al. An Examination of the Effects of Broadband Air-conduction Masker On the Speech Intelligibility of Speech-modulated Bone-conduction Ultrasound. Hear Res. 2014;317:41-9. PubMed PMID: 25285623.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - An examination of the effects of broadband air-conduction masker on the speech intelligibility of speech-modulated bone-conduction ultrasound. AU - Nishimura,Tadashi, AU - Okayasu,Tadao, AU - Saito,Osamu, AU - Shimokura,Ryota, AU - Yamashita,Akinori, AU - Yamanaka,Toshiaki, AU - Hosoi,Hiroshi, AU - Kitahara,Tadashi, Y1 - 2014/10/05/ PY - 2014/06/03/received PY - 2014/09/18/revised PY - 2014/09/24/accepted PY - 2014/10/7/entrez PY - 2014/10/7/pubmed PY - 2015/7/29/medline SP - 41 EP - 9 JF - Hearing research JO - Hear Res VL - 317 N2 - Ultrasound can be heard by bone-conduction, and speech-modulated bone-conducted ultrasound (BCU) delivers the speech information to the human ear. One of the recognition mechanisms is the demodulation of the signals. Because some of the profoundly deaf can also hear speech-modulated BCU, another mechanism may also contribution to the recognition of speech-modulated BCU. In this study, eight volunteers with normal hearing participated. The intelligibilities of speech-modulated BCU were measured using a numeral word list under masking conditions. Because the masker can mask the demodulated sounds, the evaluation of the masking reveals the contribution of the demodulation to the recognition of speech-modulated BCU. In the current results, the masking of speech-modulated BCU differed from that of original non-modulated speech. Although the masking shifted the recognition curve for the original speech upward, the same results were not observed for the speech-modulated BCU. The masking generated the difference in the correct answers among the words for the speech-modulated BCU. The current results suggested the importance of the envelope of the modulated ultrasonic signal to the recognition under masking condition. Both demodulation and direct ultrasonic stimulation contribute to the recognition of speech-modulated BCU for the normal hearing individuals, and the direct ultrasonic stimulation plays an important role in the recognition for the profoundly deaf. SN - 1878-5891 UR - https://www.unboundmedicine.com/medline/citation/25285623/An_examination_of_the_effects_of_broadband_air_conduction_masker_on_the_speech_intelligibility_of_speech_modulated_bone_conduction_ultrasound_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0378-5955(14)00163-4 DB - PRIME DP - Unbound Medicine ER -