对信号进行频谱分析及滤波，是学习PCA特征提取的很好的学习资料，这个有中文注释，看得明白，通过matlab代码，感应双馈发电机系统的仿真，相关分析过程的matlab方法。- The signal spectral analysis and filtering, Is a good learning materials to learn PCA feature extraction, The Chinese have a comment, understand it, By matlab code, Simulation of doubly fed induction generator system, Correlation analysis process matlab method.