In Andalusian Spanish, there is a well-documented sound change in which pre- has become post-aspiration in sequences of /s/ followed by voiceless stops. Here we investigate acoustically its synchronic basis across two age groups and two different regions of Andalusia that differ in the degree to which the sound change has advanced. For this purpose, Functional Principal Component Analysis (FPCA) was applied to the probability of voicing and to the degree of closure that had been estimated from the speech signal extending between the two vowels on either side of the aspirated cluster. The first principal component derived from FPCA was mostly associated with changes to the timing of the closure. Earlier closures were characteristic of both younger and West Andalusian speakers and of alveolar stops. In the signals parametrised by the first PC score, post- and pre-aspiration were found to be acoustically inversely related to each other and predictable from closure timing. The general conclusion is that the sound change by which pre- evolves into post-aspiration is a derivative of resynchronising the closure relative to the voiceless interval that emerges after decomposing speech signals varying over a wide range of speakers into principal components of variation.

在安达卢西亚西班牙语中，有一个有据可查的声音变化，即前/后// s /后无声停止变成了后抽吸。在这里，我们在两个年龄段和安达卢西亚的两个不同区域进行声学上的共鸣基础研究，声音变化的发展程度不同。为此，将功能主成分分析（FPCA）应用于发声的可能性以及根据从吸气簇两侧的两个元音之间延伸的语音信号估计的闭合程度。源自FPCA的第一个主要成分主要与关闭时间的变化有关。较早的和较早的安达卢西亚语系和西方安达卢西亚语系以及肺泡阻滞的特征是闭塞。在第一个PC得分参数化的信号中，发现吸气后和吸气前在声学上成反比，并且可以根据闭合时机预测。总的结论是，从声音演变成吸入后的声音变化是相对于无声区间重新同步关闭的衍生形式，无声区间是在将范围广泛的扬声器中变化的语音信号分解为变化的主要成分之后出现的。