【作者】 纪跃波；

【Author】 JI Yue-bo(Mechanical Engineering College, Jimei University, Xiamen 361021)

【机构】 厦门市集美大学机械工程学院；

【摘要】 介绍了典型的时频分析方法及所研发的虚拟式多功能时频分析系统。该仪器系统功能十分强大,主要包括:零相位数字滤波、短时付氏变换、多分辨时频分析、魏格纳分布、乔伊威廉斯分布、小波和小波包阈值滤波、二进小波及小波包正交分解、连续小波变换等。文中逐一介绍各主要功能的基本原理。给出了仪器的开发、设计、仿真及其应用实例。值得一提的是,在分析极大极小尺度共存信号时,作者所提出的多分辨时频分析方法比其它经典时频分析方法有明显的优势。更多还原

【Abstract】 Introduces the classic means of Time-Frequency Analysis and the main functions of The Virtual System of Multi-Functions Time Frequency Analyzer which developed recently. The main functions includes Amplitude Analysis in time domain, Amplitude Analysis in frequency domain, Zero-phase Distortion Digital Filtering, Short Time Fourier Transform (STFT), Multi-resolution Time-Frequency Analysis (MRTFA), Wigner Distribution (WD), Choi-Williams Distribution (CWD), Threshold Filtering (TF) based on Wavelet Transform (WT) or Wavelet Packet Transform (WPT), orthonormal decomposition based on dyadic WT or WPT, Continual Wavelet Transform (CWT) etc. This paper introduces the theory of main functions of JTF-1 and its functions, its design and development way. At last, gives some examples of simulation and practical application of JTF-1. It is worth speaking that MRTFA proposed by the author is testified to be advantageous in analyzing the signal with small and large scale component signals together through simulation test and practical application of it compared with other classic means of TFA.更多还原