中文说明：
用fft进行特征提取，并画出相应的图。再进行神经网络分类。
English Description：
FFT is used for feature extraction, and the corresponding graph is drawn. Then the neural network classification is carried out.
Feature extraction and neural network classification
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中文说明：
用fft进行特征提取，并画出相应的图。再进行神经网络分类。
English Description：
FFT is used for feature extraction, and the corresponding graph is drawn. Then the neural network classification is carried out.
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