摘要
依据DDS基本原理,为实现单音调频波的DDS,提出了通过调整频率控制字来查表得到所需信号数字序列的思想,并进行了理论分析和研究,得到了计算方法,其结论用MATLAB6.5进行了仿真,同时通过QuartusⅡ3.0应用到FPGA设计上,实践表明该方法是行之有效的。叙述了信号序列产生设计方法,重点介绍频率控制字分析和研究过程、FPGA实现方案及其仿真实验结果。
According to the principle of Direct Digital Synthesis,an idea for generating DDS frequency-modulated wave by single signal is presented by adjusting frequency control word in look-up-table to achieve digit sequence. Theoretical study and analysis are carried out. The conclusion is acquired and simulated by MATLAB 6.5,and ap- plied on FPGA design by Quartus Ⅱ 3.0. The experiment shows that the way is feasible. The design method of signal sequence generator is introduced. The process of study and analysis of frequency control word,practical FPGA design plan,and simulation and experiment result are given mainly in the paper,
出处
《电声技术》
2005年第10期36-39,共4页
Audio Engineering
基金
湖南省自然科学基金资助项目(02JJY5011)
关键词
DDS
单音调制FM波
频率控制字
FPGA
DDS
single-tone Frequency-Modulated wave
frequency control word
FPGA
