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采样率小于一个连续时间信号最大频率的2倍时就叫undersampling,欠采样,根据抽样定理,当fs>=2fmax,也就是oversampling,过采样时,数字信号才能重建成原来的模拟信号,欠采样重建会发生混叠-Sampling rate of a continuous-time signal is less than the maximum frequency of 2 times is called undersampling, bandpass sampling, according to sampling theorem, when fs