Modulation rate PCA resulting loading patterns.

Mean rectified loading patterns for the first 3 principal components obtained for spectral bands 1–5 in the modulation rate PCA, averaged over all speech samples. In (a, left), the PC loading patterns for each spectral band are overlaid. In (b, right), the same loading data is separated by PCs into subplots for clarity. For both (a) and (b), the 5 different colours indicate the 5 different spectral bands. The linestyle (solid, dashed or dotted) indicates the PC number. Coloured circles show local troughs in loading that indicate potential boundaries between modulation rate bands (also marked on the x-axis with vertical dotted lines). The coloured diamonds show local peaks in loading that indicate clusters of modulation rate channels that show strong covariance in temporal patterning. The colour of each circle or diamond reflects its spectral band, following the main colour scheme.

本数据集为调制率主成分分析（modulation rate PCA）中针对光谱波段1至5得到的前3个主成分（Principal Components，PC）的经校正载荷模式，且已对全部语音样本取平均。左图（a）中，各光谱波段的PC载荷模式被叠加展示；右图（b）中，为便于清晰呈现，将同一载荷数据按主成分拆分为多个子图。图a与图b均以5种不同颜色分别对应5个光谱波段，线条样式（实线、虚线或点线）用于标识主成分序号。带色圆形代表载荷的局部谷值，对应调制率波段间的潜在分界（该分界亦通过x轴上的垂直点线标注）；带色菱形代表载荷的局部峰值，对应在时间模式下呈现强协方差的调制率通道簇，每个圆形或菱形的颜色遵循主配色方案，与其所属的光谱波段保持一致。