Vocal tract area functions from magnetic resonance imaging
Vocal tract area functions from magnetic resonance imaging
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DOI：
10.1121/1.415960
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发表时间：
1996-07-01
影响因子：
2.4
通讯作者：
Hoffman, EA
中科院分区：
文献类型：
--
作者：
Story, BH;Titze, IR;Hoffman, EA
在声道建模领域已经有相当多的研究工作，但关于声道形状的直接三维测量的信息仍然很少。本研究的目的是利用核磁共振成像（MRI）获得说话者特定的、三维的、声道空气空间形状的清单，这些形状对应于一组特定的元音和辅音。一名男性受试者在发声时被扫描了12个元音、3个鼻音和3个爆破音，得到了一组18个形状。对三维形状进行分析，发现在平面内评估的横截面积总是选择与从声门延伸到嘴的中心线垂直，以产生“面积函数”。“这篇论文为18种声道形状提供了一个特定于说话者的区域功能目录。从成像对象的自然（记录）语音中提取的形成峰位置与使用新获得的区域函数模拟的形成峰位置的比较显示出合理的相似性，但表明成像的声道形状可能有些集中。此外，本研究中报道的区域功能的比较与之前的四项研究进行了比较，结果表明在形状上大致相似，但也有明显的差异，这可归因于成像技术、图像处理方法的差异以及成像对象的解剖差异。(C) 1996美国声学学会。
There have been considerable research efforts in the area of vocal tract modeling but there is still a small body of information regarding direct 3-D measurements of the vocal tract shape. The purpose of this study was to acquire, using magnetic resonance imaging (MRI), an inventory of speaker-specific, three-dimensional, vocal tract air space shapes that correspond to a particular set of vowels and consonants. A set of 18 shapes was obtained for one male subject who vocalized while being scanned for 12 vowels, 3 nasals, and 3 plosives. The 3-D shapes were analyzed to find the cross-sectional areas evaluated within planes always chosen to be perpendicular to the centerline extending from the glottis to the mouth to produce an ''area function.'' This paper provides a speaker-specific catalogue of area functions for 18 vocal tract shapes. Comparisons of formant locations extracted from the natural (recorded) speech of the imaged subject and from simulations using the newly acquired area functions show reasonable similarity but suggest that the imaged vocal tract shapes may be somewhat centralized. Additionally, comparisons of the area functions reported in this study are compared with those from four previous studies and demonstrate general similarities in shape but also obvious differences that can be attributed to differences in imaging techniques, image processing methods, and anatomical differences of the imaged subjects. (C) 1996 Acoustical Society of America.