基于LabWindows/CVI的联合时频分析

The Joint Time-Frequency Analysis Based on LabWindows/CVI

在LabWindows/CVI平台的基础上,研究了利用联合时频分析（JTFA）方法来分析信号的能量分布情况。此方法利用了短时傅里叶变换（STFT）的基本原理,对一些非平稳信号进行分析,能很好地描述信号的频率如何随时间而变化。这种方法比单独利用时域或频域来分析信号具有一定的优越性。

Based on the LabWindows/CVI platform,we have studied the energy distribution situation of the signal by the joint time-fre-quency ana1sis method.This method has used the short-time Fourier transform basic principle to analyze some non-steady signals,and the method can describe how the signal frequency changes along with the time well.This method has certain superiority compared to analyzing the signal by using the time domain or the frequency range singlely.