处理信号的时频分析，数学方法是部分子空间法，使用混沌与分形分析的例程，基于人工神经网络的常用数字信号调制，一个很有用的程序，能量熵的计算，阵列信号处理的高分辨率估计，基于互功率谱的时延估计。- When processing a signal frequency analysis, Mathematics is part of the subspace, Use Chaos and fractal analysis routines, The commonly used digital signal modulation based on artificial neural network, A very useful program, Energy entropy calculation, High-resolution array signal processing estimates, Based on the time delay estimation of power spectrum.