中文说明：对于初学matlab的同学会有帮助，信号处理中的旋转不变子空间法，主要是基于mtlab的程序，pwm整流器的建模仿真，主要为数据分析和统计，实现了对10个数字音的识别程。
English Description：
For the beginner will help students in MATLAB, signal processing in rotation invariant subspace method, mainly based on MTLAB procedures, the modeling and Simulation of PWM rectifier, mainly for data analysis and statistics, the realization of the 10 digital audio recognition.