CAJ | 학술논문

在LabVIEW平台的基础上，研究了利用时频域测试方法，分析数字信号(以下简称信号)在时-频平面内时间与频率之间的变化关系。该测试分析方法利用短时傅里叶变换(STFT)的基本原理，对一些非平稳的信号进行分析，但在信号处理过程中，能得到的信号长度总是有限的；所以，需对无限长的时间序列施加1个窗函数，在此基础上，分析窗函数的选择对其时频域分析的影响。
재LabVIEW평태적기출상，연구료이용시빈역측시방법，분석수자신호(이하간칭신호)재시-빈평면내시간여빈솔지간적변화관계。해측시분석방법이용단시부리협변환(STFT)적기본원리，대일사비평은적신호진행분석，단재신호처리과정중，능득도적신호장도총시유한적；소이，수대무한장적시간서렬시가1개창함수，재차기출상，분석창함수적선택대기시빈역분석적영향。
Based on the LabVIEW platform,it was studied that analyzing the signal in the time-frequency plane between the time and frequency by using frequency domain test method.This testing method did some of the non-stationary signal a-nalysis by using the short time variations of Fu Liye (STFT)theory.But in the digital signal processing,signal length got-ten is always limited,so it is needed to impose a window function on the time series of infinite length.On this basis,the in-fluence of window function selection on time frequency domain was analyzed,this paper has certain reference value for re-searchers engaged in signal processing.