作　　者： ; ;

机构地区： 大连海事大学信息科学技术学院

出　　处： 《电气电子教学学报》 2006年第3期73-75,84,共4页

摘　　要： 本文介绍采用A/D转换器和DSP技术实现混频的一种实验方法,文章从频域角度分析与研究A/D转换器的频率变换功能,并采用欠抽样技术(带通采样技术)对高频带通信号进行采样,然后通过DSP软件编程对采样信号进行实时处理与滤波,便得到低频带通信号。与常规电子线路组成的混频器比较,这种基于A/D和DSP技术实现混频的实验结果表明:对一些固定频率的带通信号是可以实现下混频的。 This paper mainly introduces an experiment method of the realization of frequency mixing based on A/D convertor and DSP technique, analyzes and studies the frequency transformation function of the A/D convertor in frequency domain, down sampling（band pass sampling technique） is adopted to sample the high frequency band pass signal. Then the sampled signal is real-time processed and filtered by DSP software programming, and the low frequency band pass signal is obtained. Comparing with the conventional electronically circuit mixer, the experiment result Of the frequency mixing based on A/D and DSP technique indicates that the realization of down mixing for some band pass signal of fixed carrier frequency is possible.

关 键 词： 转换 混频 带通信号

领　　域： [文化科学] [文化科学] [电子电信] [电子电信]