用小波分析方法做时频图，这是一个例子，做信号分析的时候比较有用-Method using wavelet analysis of time-frequency map, which is an example of signal analysis to do more useful when

传统的傅立叶变化只能分析时域、频域图，而小波变化能进行时频分析，对信号进行更好的处理。(The traditional Fourier transform can only analyze the time domain and frequency domain diagram, while the wavelet transform can carry on the time-frequency analysis and better deal with the signal.)