Department of Speech and Hearing Science, University of Illinois at Urbana-Champaign, 901 South Sixth Street, Champaign, Illinois 61820, USA
J Acoust Soc Am. 2018 Jul;144(1):EL7. doi: 10.1121/1.5044508.
Directivity patterns for vocalizations radiating from the human mouth have been examined regularly, but phoneme-specific changes in radiation have rarely been identified. This study reports half-plane horizontal directivity up to 20 kHz with 15° angular resolution for /ɑ/, /e/, /i/, /o/, and /u/ extracted from running speech, compared with long-term averaged speech. An effect of vowel category on the directivity index was observed, with /ɑ/ being most directional. Angle-dependent third-octave band weighting functions, useful for simulating real-world listening conditions, highlighted disparities in directivity between running speech and individual vowels. These findings point to rapidly changing dynamic directivity patterns during speech.
人类口腔发声的指向性模式已被常规研究，但很少有研究能够识别出特定音素的辐射变化。本研究报告了在 15°角分辨率下，20kHz 范围内，从连续语音中提取的/a/、/e/、/i/、/o/和/u/的半平面水平指向性，与长期平均语音相比。观察到了元音类别对指向性指数的影响，其中/a/的指向性最强。角度相关的第三倍频带加权函数对于模拟真实世界的聆听条件非常有用，它突出了连续语音和单个元音之间的指向性差异。这些发现表明在言语过程中存在快速变化的动态指向性模式。
