说明：  MATLAB2008版，建立并训练Bp神经网络，实现对四种信号的分类识别功能,这里省掉了四种信号数据的产生，自己取得样本后使用BP神经网络进行训练并自动分类，样本一部分作为训练用，一部分作为检验用，输入为样本的四个特征，特征后面对应输出以便计算正确率，识别率很高
(MATLAB2008 version, the establishment and training of Bp neural network, four signal classification and recognition capabilities, saved four signal data generated, secured a sample using BP neural network training and automatic classification of samples as part of the training , as part of the inspection, four characteristics of the input for the sample feature behind the corresponding output in order to calculate the correct rate, a high recognition rate)