摘要
介绍了基于dsPIC的测试系统结构,以及对移频信号进行测试的原理和算法。采用同时从时域和频域两个分析域着手的方法,避开利用频谱幅值求取频偏进而获得边频,而在时域中求取边频;在频域中运用频谱细化技术,提高了运算处理的速度以及频率测试精度,并给出了简洁实用的算法。试验结果表明,该方法能够对移频信号进行准确快速的测量。
The structure of the testing system based on dsPIC processer and the princeple and algorithm for Frequency - shift signal were introduced. Time Domain and Frequency Domain are analysed simultaneous, it had better effects in improving processing speed and the accuracy of the frequency test by obtaining the side frequency no using Frequency Offset by using spectrum amplitudes, but had it in the Time Domain , and by using Zoom spectrum in the Frequency Domain. In this paper, asimple and practical algorithm was presented. Actual test showed that the method can measure the frequency of frequency - shift signal precisely and lastly.
出处
《微处理机》
2009年第6期117-120,123,共5页
Microprocessors
关键词
信号处理
频率分辨率
频谱
Signal Processing
Frequency Resolution
Frequency Spectrum
