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import numpy as npfrom scipy.signal import butter, lfilter定义输入信号input_signal = np.sin(2 * np.pi * 100 * np.arange(0, 1, 0.001))定义滤波器参数cutoff_freq = 50 # 截止频率order = 4 # 滤波器阶数构建低通滤波器b, a = butt...