说明三个分段相连的信号的傅里叶变换和时频分析-connected signal the Fourier transform and time-frequency analysis

时频信号分析，分数阶傅里叶变换，matlab实现工具包-time-frequency signal analysis—fractional fourier transform—tool kits（in matlab）

基于维格纳分布的Chirplet变换，可用于信号的处理分析，形成时频图。-Based on Wigner distribution Chirplet conversion, it can be used for analysis of the signal processing, the formation frequency diagram.