FIR 底通和带通滤波器和IIR 底通和带通滤波器，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，采用热核构造权重。- Bottom-pass and band-pass FIR and IIR filter bottom pass and band-pass filter, Random ppm modulated analog signal under Is a good learning materials to learn PCA feature extraction, Thermonuclear using weighting factor.