BP神经网络用于函数拟合与模式识别，实现了对10个数字音的识别，pwm整流器的建模仿真，本程序的性能已经超过其他算法，在matlab R2009b调试通过，是国外的成品模型。- BP neural network function fitting and pattern recognition, To achieve the recognition of 10 digital sound, Modeling and simulation pwm rectifier This program has exceeded the performance of other algorithms, In matlab R2009b debugging through, Foreign model is finished.