有循环检测，周期性检测，验证可用，微分方程组数值解方法，随机调制信号下的模拟ppm，是学习PCA特征提取的很好的学习资料，包含特征值与特征向量的提取、训练样本以及最后的识别，FIR 底通和带通滤波器和IIR 底通和带通滤波器。- There are cycle detection, periodic testing, Verification is available, Numerical solution of differential equations method, Random ppm modulated analog signal under Is a good learning materials to learn PCA feature extraction, Contains the eigenvalue and eigenvector extraction, the training sample, and the final recognition, Bottom-pass and band-pass FIR and IIR filter bottom pass and band-pass filter.