Nábĕlek A K, Ovchinnikov A, Czyzewski Z, Crowley H J
College of Liberal Arts, Department of Audiology and Speech Pathology, University of Tennessee, Knoxville 37996, USA.
J Acoust Soc Am. 1996 Mar;99(3):1742-53. doi: 10.1121/1.415238.
The relationship between relative intensity of transition segments and identification of diphthongs has been investigated. In the first experiment, synthesized stimuli were used. The stimuli differed in the amount of attenuation of the transition segment which ranged from 0 to 15 dB. It was expected that [diphthong in text] responses would be obtained for stimuli with attenuated transitions. The stimuli were tested in quiet, noise, and reverberation with ten normal-hearing and seven hearing-impaired subjects. For the stimulus with the most attenuated transition, the normal-hearing subjects gave no [diphthong in text] responses and the hearing-impaired subjects gave only 20% [diphthong in text] responses in quiet. However, in noise, both groups of subjects gave 70% [diphthong in text] responses and in reverberation, the normal-hearing subjects gave 95% and the hearing-impaired subjects gave 90% [diphthong in text] responses. Generally, less transition attenuation was needed for the hearing-impaired than for the normal-hearing subjects to give [diphthong in text] responses. These findings indicated that identification errors in noise and reverberation for naturally produced diphthongs might be related to the intensity of their transition segments. In the second experiment, naturally produced diphthongs [diphthongs in text] from the Nábĕlek et al. [J. Acoust. Soc. Am. 92, 1228-1246 (1992)] study were spectrally analyzed. There were 30 different tokens for each diphthong. The results of the analyses indicated significant correlations between the number of identification errors for these diphthongs made by either normal-hearing or hearing-impaired subjects and the relative intensities of the F2 transition segment. In both noise and reverberation there were fewer errors for the diphthong tokens characterized by high intensity F2 transitions.
过渡段的相对强度与双元音识别之间的关系已得到研究。在第一个实验中，使用了合成刺激。刺激在过渡段的衰减量上有所不同，范围从0到15分贝。预计对于过渡段衰减的刺激会得到[文本中的双元音]反应。这些刺激在安静、噪声和混响环境中对10名听力正常和7名听力受损的受试者进行了测试。对于过渡段衰减最大的刺激，听力正常的受试者在安静环境中没有给出[文本中的双元音]反应，而听力受损的受试者仅给出了20%的[文本中的双元音]反应。然而，在噪声环境中，两组受试者都给出了70%的[文本中的双元音]反应，在混响环境中，听力正常的受试者给出了95%的[文本中的双元音]反应，听力受损的受试者给出了90%的[文本中的双元音]反应。一般来说，与听力正常的受试者相比，听力受损的受试者给出[文本中的双元音]反应所需的过渡段衰减更少。这些发现表明，自然产生的双元音在噪声和混响环境中的识别错误可能与其过渡段的强度有关。在第二个实验中，对来自纳贝莱克等人[《美国声学学会杂志》92, 1228 - 1246 (1992)]研究中的自然产生的双元音[文本中的双元音]进行了频谱分析。每个双元音有30个不同的样本。分析结果表明，听力正常或听力受损的受试者对这些双元音的识别错误数量与F2过渡段的相对强度之间存在显著相关性。在噪声和混响环境中，以高强度F2过渡为特征的双元音样本的错误较少。
