Journal of South China University of Technology (Natural Science Edition) ›› 2007, Vol. 35 ›› Issue (5): 15-19.

• Electronics, Communication & Automation Technology • Previous Articles     Next Articles

Frequency-Domain Resolution and Its Improvement During Empirical Mode Decomposition

Hu Wei-ping1  Mo Jia-lini2  Du Ming-hui1   

  1. 1. School of Electronic and Information Engineering , South China Univ. of Tech. , Guangzhou 510640 , Guangdong , China;2. College of Physics and Electronics Tech. , Guangxi Normal Univ. , Guilin 541004 , Guangxi , China
  • Received:2006-03-20 Online:2007-05-25 Published:2007-05-25
  • Contact: 胡维平(1963-)，男，博士生，主要从事生物医学信号处理、图像处理方面的研究. E-mail:huwp@mailbox.gxnu.edu.cn
  • About author:胡维平(1963-)，男，博士生，主要从事生物医学信号处理、图像处理方面的研究.
  • Supported by:

    广东省自然科学基金资助项目(05006593 ) ;广西自然科学基金资助项目(0448035)

PDF

309

Abstract:

The main task of Empirical Mode Decomposition (EMD) is to offer the monocomponents or narrow band signals prior to Hilbert transform. During the EMD , the frequency band of intrinsic mode function (IMF) is rather wide due to the mode mixing and the signal interaction. In order to solve this problem , the band width of IMF resulting from a single EMD is investigated , and the corresponding instantaneous frequency resolution is calculated ,
on the basis of which an improved signal masking method is proposed to narrow the frequency band of signal before the standard EMD. Experimental results show that the proposed method can not only overcome the mode mixing in EMD completely but also avoid the disadvantages caused by the signal interaction , thus effectively improving the frequency-domain resolution expressed by IF after the Hilbert transform of IMF.

Key words: Empirical Mode Decomposition, mode mixing, instantaneous frequency, spectrum resolution