为了克服傅氏变换不能同时保留信号的时间

信息和频率信息的缺点,人们引进了局域波法，它是最近发展起来的处理非线性、非平稳信号的时频分析方法,通过对信号局部特征出发,直接由信号本身构造基函数,具有良好的局部适应性-In order to overcome the Fourier transform of the shortcomings of the time and frequency information of the signal can not be reserved, the introduction of local wave method, it was recently developed for nonlinear and non-stationary signal time-frequency analysis method, the local signalcharacterized in departure directly from the signal itself is constructed yl function, having a good local adaptability