说明：  基于matlab的bp神经网络学习算法用于数据的分类--主要针对语音信号进行分类。本案例中选举了民歌、古筝、摇滚和流行音乐四类不同类型，用bp神经网络实现对这四类音乐的有效分类
(Based on matlab bp neural network learning algorithm for data classification - mainly for voice signal classification. In this case, four different types of folk songs, zither, rock and pop music were selected, and the effective classification of these four types of music was realized by using bp neural network.)