frequency sampling theorem

In the course of the sampling, the sampling theorem is a basic rule and points out the least sampling frequency for reconstructing the signals.

采样定理是采样过程中所遵循的基本规律，它指出了重新恢复连续信号所必需的最低采样频率。

For bandpass signal under digital quadrature sampling, there is spectrum shifting. Although the sampling frequency satisfies the sampling theorem, it may cause spectrum aliasing.

在数字正交采样中，带通信号存在频谱迁移问题，虽然满足带通信号的采样定理，仍可能产生频谱混叠。

Though examples of common signal and sine signal, by the frequency spectrum graph and theoretical analysis, the minimum sample rate of the sampling theorem is made clear.

以一般信号和正弦信号为例，通过理论分析和频谱图示意，对抽样定理中最低抽样率的取值进行了明确的说明。