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一种新的退避算法，用matlab仿真来实现该算法(a new way to complete the BP_decode)

双音多频 DTMF（ Dual Tone Multi-Frequency ）信号，是用两个特定的单音频率信号的组合来代表数字或功能(DTMF DTMF (Dual Tone Multi-Frequency) signals, use of two specific combinations of tone frequency signals to represent the number or function)

定步长ODE4、ODE5算法，用法和ode45相似 唯一不同的就是ode45是[t,y]=ode45(), 这个是y=ode4()，因为是定步长的(Fixed-step ODE4, ODE5 algorithms, usage, and the only difference is similar to ode45 ode45 is [t, y] = ode45 (), this is y = ode4 (), because the step length is fixed)

（1） 本系统用到四种神经网络对漏电嫌疑系数进行预测，分别是BP神经网络、RBF神经网络、GRNN神经网络、Elman神经网络，通过对神经网络结构参数的设置和调试，可以得到很好的预测效果，实际值和预测值之间的误差能达到5 以内。 （2） 本系统使用matlab做GUI界面，在界面上就可以分别对这四种神经网络的结构参数进行设置，从而可以调整神经网络的结构，达到较好的预测精度。 ((1) The system used four neural network to predict the suspected leakage coefficient, respectively, the BP neural network, RBF neural network, GRNN neural network, Elman neural network, the neural network structure parameter setting and commissioning, can get very good prediction, between the actual and predicted values ​ ​ of error of less than 5 . (2) the use matlab to do the GUI interface, the interface can each of these four neural network structure parameters set, the structure of the neural network, which can be adjusted to achieve better prediction accuracy.)

说明：  数值分析 清华大学 杨顶辉 数值实验4.1 算法设计与比较(numerical analysis)

矩阵逆运算，tsvd的算法，matlab函数程序(Matrix inverse operation, tsvd algorithm, matlab function procedures)

说明：  自己编写的用WSE的方法设计的二维数字滤波器，效果不错。(themselves with WSE prepared by the method of two-dimensional design of digital filters, effectiveness.)

说明：  一些有关最优控制理论的控制实例程序集和仿真 (Control instance assembly of the optimal control theory and simulation)

It provides complete, clear, and detailed explanations of advanced electri- cal engineering concepts illustrated with numerous practical examples.

Mass spring damper model