CZT和FFT的C语言实现代码，能有效滤除谐波，噪声。获得信号的频率，是一种良好的频率测量算法。

dft频率测量算法，主要针对电网频率的测量-the dft frequency measurement algorithm

小波包分析提取振动信号中的特征频率，做视觉测量的上位机代码,表示出两帧图像间各个像素点的相对情况。- Wavelet packet analysis to extract vibration signal characteristic frequency, Do Vision Measurement PC code, Between two images showing the relative circumstances of each pixel.

程序内部含基准频率，可测量输入频率时变的信号 并画出频率变化波形(The program contains the reference frequency, which can measure the time-varying signal of input frequency and draw the waveform of frequency variation)