BP网络能学习和存贮大量的输入-输出模式映射关系，而无需事前揭示描述这种映射关系的数学方程，此代码能实现BP神经网络的数据分类-语音特征信号分类-BP network can learn and store a lot of input and output model mapping relations, without prior reveals describe the mapping relation mathematical equations, the code can realize the BP neural network of data classification-voice characteristic signal classification