带通采样特点和仿真

数字信号处理首先要把模拟信号变换为数字信号，最常用的方法是采样，奈奎斯特定律要求采样频率大于等于信号最高频率的两倍，对中心频率较高而频带较窄的信号使用奈奎斯特定律，会造成采样频率很高同时有很多频段空白，带通采样和低通采样在本质上相同，而采样只与信号带宽有关，所以对这种信号使用带通采样可以大大降低采样率，本文对带通采样进行详细的分析并进行仿真。

The Character and Simulation of Band-Pass Sampling

Analog signal needs to be changed into digital signal before using DSP and the most popular method is sampling. Nyquist theory de- mands the sampling rate to be more than twice the signal rate. To some narrow band signals which are modulated to high frequency, the sampling rate can be chosen in relation to their bands, but not their carrier frequency. In this paper, this kind of sampling carefully and simulates it are analysed.