针对低通采样信号和带通采样信号分别用满足乃奎斯特抽样定理和不满足乃奎斯特抽样定理的条件进行抽样，并分析其频谱特征。-For lowpass and bandpass sampled signal sampled signals were used to satisfy the Nyquist sampling theorem and the Nyquist sampling theorem does not satisfy the conditions of sampling and analysis of its spectral characteristics.