The recursive Fourier algorithm is used in frequency measuring to dynamically track the frequency change and real-timely adjust the sampling rate for fixed sampling points.
采用递推傅氏算法测频，动态跟踪频率变化，实时调整采样率进行定点采样；
Using this algorithm, this paper has adopted fixed sampling rate when measuring without adjusting sampling intervals according to network frequency.
使用本算法，在测量时可以以固定采样率进行采样，不必根据电网频率调整采样间隔。
Main finished work include: AD conversion, over-sampling, filtering, FFT transform, Quinn and Rife-Jane algorithm, graphic, frequency spectrum and the result of measuring displayed on LCD.
所完成的工作有：AD转换、过采样、滤波处理、FFT变换、Quinn和Rife - Jane算法、液晶显示图形、频谱和测量的结果。
A new method for measuring the total harmonic distortion of ultra low frequency signa1 by means of FFT algorithm is presented and the measuring error is analysed in this paper.
本文提出了采用FFT算法来测量超低频失真度的方法，解决了超低频失真度的测量问题。
A new method for measuring the total harmonic distortion of ultra low frequency signa1 by means of FFT algorithm is presented and the measuring error is analysed in this paper.
本文提出了采用FFT算法来测量超低频失真度的方法，解决了超低频失真度的测量问题。
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