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在短时 Fourier变换 ( STFT)的基础上 ,通过对窗函数在时间尺度上引入伸缩变换 ,从而获得一个在相空间可变的窗口 (即可调时 -频窗 ) ,实现时频分辨率随信号频率变化自动可调 ,克服STFT分析所有频率窗口的大小形状固定不变的缺陷 ,为非平稳信号的处理提供了强有力的工具。
On the basis of short-time Fourier transform (STFT), a window with variable time-frequency window (ie, adjustable time-frequency window) is obtained by introducing the scaling function on the time scale of the window function, and the time-frequency resolution The signal frequency is automatically adjustable to overcome the STFT analysis of all the frequency window shape and size of the fixed defects, for non-stationary signal processing provides a powerful tool.