说明：  S变换采用高斯窗函数且窗宽与频率的倒数成正比，免去了窗函数的选择和改善了窗宽固定的缺陷，并且时频表示中各频率分量的相位谱与原始信号保持直接的联系，S变换具有良好的时频特性，适合用S变换对信号的一些时频与特征进行提取。
(S-transform uses Gauss window function and the window width is proportional to the reciprocal of frequency. It avoids the selection of window function and improves the defect of fixed window width. Moreover, the phase spectrum of each frequency component in time-frequency representation keeps direct contact with the original signal. S-transform has good time-frequency characteristics and is suitable for extracting some time-frequency and characteristics of signal by S-transform.)