摘要
介绍了短时傅里叶变换、Cohen类时频分布、小波变换、Hilbert-Huang变换四种典型的时频分析方法,分析对比结果显示了用Hilbert-Huang变换对声音信号进行时频分析的优越性,结合LabVIEW在数据采集和仪器控制领域的强大功能,提出以声卡作为采集硬件、LabVIEW作为软件编程、Hilbert-Huang变换作为时频分析方法的一种声音信号采集分析系统。实验结果表明,这种采集分析系统非常适合频率在音频范围之内(20 Hz^20 kHz)的声音信号的时频谱分析。
This paper introduces four typical methods of time-frequency analysis, such as short time Fourier transform, Cohen class distribution, continuous wavelet transform, Hilbert-Huang transform. The results of analysis and comparison show that the superiority of Hilbert-Huang transform for time-frequency analysis of sound signals. Combined with the powerful of LabVIEW in data acquisition and instrument control, this paper presents a sound signal acquisition and analysis system, the system＇ s hardware is sound card, the system＇ s software is LabVIEW, and the system＇ s time-frequency analysis method is Hilbert-Huang transform. Experimental results show that the sound signal acquisition and anal- ysis system is very suitable for time-frequency analysis of sound signals in 20 Hz -20 kHz frequency range.
出处
《微型机与应用》
2016年第7期73-75,78,共4页
Microcomputer & Its Applications
关键词
声卡
LABVIEW
时频分析
EMD
sound card
LabVIEW
time-frequency analysis
empirical mode decomposition
