基于单片机的频率跟踪系统设计  

Design of measuring system for the frequency of signals based on single chip machine

作　　者：刘京诚[1] 罗勇[1] 刘俊[1] 任松林[1] 

机构地区：[1]重庆大学光电技术及系统教育部重点实验室,重庆400044

出　　处：《电子测量技术》2008年第6期177-179,183,共4页Electronic Measurement Technology

摘　　要：本文设计了一种测量信号频率的系统。它利用ADC0809芯片把模拟信号变成数字信号,然后通过单片机MSC-51对数字信号做快速傅立叶变化(FFT),得到信号的频谱。通过分析处理该频谱,从而找到信号的频率。最后分析了这种基于快速傅立叶变化测量频率方法的精度,并提出了改善精度的方法。A method of measuring the frequency of signals is presented. It changes analog signals into digital signals by using ADC0809 chip, and then does the fast fourier transform （FFT） with the digital signals in the single chip machine of AT89C51 to get the spectrum of the signals. Through analyzing the spectrum, the frequency of signals is found. At last, the precision of the method that bases on FFT is discussed, and the method to improve the precision is put forward.

关 键 词：频谱分析 快速傅立叶变化(FFT) 单片机 模数转换(A/D) 

分 类 号：TN911.72[电子电信—通信与信息系统]