Articulatory tradeoffs reduce acoustic variability during American English |r| production
Articulatory tradeoffs reduce acoustic variability during American English |r| production
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DOI：
10.1121/1.426900
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发表时间：
1999-05-01
影响因子：
2.4
通讯作者：
Perkell, JS
中科院分区：
文献类型：
--
作者：
Guenther, FH;Espy-Wilson, CY;Perkell, JS
长期以来，美式英语音素/r/一直与发音过程中的大量发音变化联系在一起。本文探讨了一种假设，即说话者在不同的语境中用来产生发音/r/的发音变化表现出系统性的权衡，或发音交易关系，尽管声道形状有很大的变化，但发音交易关系仍能保持相对稳定的声音信号。声学和发音录音是从七个说话者那里收集的，这些人在五个语音环境中产生/r/。对于每个说话者来说，在不同的语音环境中用于产生/r/的不同发音器配置显示出系统的权衡，安装在舌头上的换能器的位置之间的显著相关性证明了这一点。对声学和发音差异的分析表明，这些权衡作用于降低声学变异性，从而允许在不严重降低主要声学提示的情况下/r/的声道形状的相对较大的上下文变化。此外，一些受试者似乎在不同的语音环境中使用完全不同的发音手势来发出/r/。从当前的语音运动控制模型来看，这些结果似乎更倾向于为每个音素使用声学或听觉目标的模型，而不是为每个音素使用声道形状目标的模型。(C)1999年美国声学学会。[S0001-4966(99)00205-2]。
The American English phoneme /r/ has long been associated with large amounts of articulatory variability during production. This paper investigates the hypothesis that the articulatory variations used by a speaker to produce /r/ in different contexts exhibit systematic tradeoffs, or articulatory trading relations, that act to maintain a relatively stable acoustic signal despite the large variations in vocal tract shape. Acoustic and articulatory recordings were collected from seven speakers producing /r/ in five phonetic contexts. For every speaker, the different articulator configurations used to produce /r/ in the different phonetic contexts showed systematic tradeoffs, as evidenced by significant correlations between the positions of transducers mounted on the tongue, Analysis of acoustic and articulatory variabilities revealed that these tradeoffs act to reduce acoustic variability, thus allowing relatively large contextual variations in vocal tract shape for /r/ without seriously degrading the primary acoustic cue. Furthermore, some subjects appeared to use completely different articulatory gestures to produce /r/ in different phonetic contexts. When viewed in light of current models of speech movement control, these results appear to favor models that utilize an acoustic or auditory target for each phoneme over models that utilize a vocal tract shape target for each phoneme. (C) 1999 Acoustical Society of America. [S0001-4966(99)00205-2].