Ultrasound and center of gravity frequency data for the sequences /ʃ#s/ and /s#ʃ/ produced by Central Catalan speakers reveal that the former sequence is implemented through continuous articulatory and spectral trajectories which, depending on speaker, may be: intermediate between /ʃ/ and /s/ all throughout, thus supporting a dynamic blending mechanism; /ʃ/-like at onset and intermediate between the two fricatives at offset, which is indicative of C1-to-C2 carryover coarticulation. The sequence /s#ʃ/, on the other hand, undergoes regressive assimilation into [ʃ(ʃ)] according to the acoustic signal but less clearly so in the light of the articulatory data. This discrepancy appears to be due to the fact that, while C1=/s/ assimilates indeed to C2=/ʃ/ at constriction location, coarticulation-induced changes in tongue body configuration behind the primary articulator may occur as long as they do not jeopardize the front-cavity dependent frequency characteristics of the [ʃ] frication noise. Differences in articulatory complexity between /ʃ#s/ and /s#ʃ/ appear to result from the production mechanisms involved, i.e., tongue dorsum raising behind the /s/ constriction for /s#ʃ/ and tongue body repositioning for /ʃ#s/. In agreement with this interpretation, /ʃ#s/ but not /s#ʃ/ turned out to be longer than /s#s/ and /ʃ#ʃ/.

中文翻译：

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加泰罗尼亚语摩擦音序列中的动态混合和同化。超声波和声学研究

由中部加泰罗尼亚语使用者产生的序列 /ʃ#s/ 和 /s#ʃ/ 的超声波和重心频率数据表明，前一个序列是通过连续的发音和频谱轨迹来实现的，根据说话者的不同，这些轨迹可能是： /ʃ/ 和 /s/ 贯穿始终，从而支持动态混合机制；/ʃ/ 状的起始位置和偏移处两个摩擦音之间的中间位置，这表明 C1 到 C2 的遗留协同发音。另一方面，序列/s#ʃ/根据声学信号经历了回归同化为[ʃ(ʃ)]，但根据发音数据不太清楚。这种差异似乎是由于以下事实：虽然 C1=/s/ 在收缩位置确实同化为 C2=/ʃ/，但只要不危及主咬合架后面的舌体构型，协同发音引起的变化就可能发生。 [ʃ] 摩擦噪声的前腔相关频率特性。/ʃ#s/ 和 /s#ʃ/ 之间发音复杂性的差异似乎是由所涉及的产生机制引起的，即 /s#ʃ/ 时舌背在 /s/ 收缩后面抬起，而 /ʃ# 时舌体重新定位s/. 与这种解释一致，/ʃ#s/ 但不是 /s#ʃ/ 比 /s#s/ 和 /ʃ#ʃ/ 长。