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Postural time-series analysis using Empirical Mode Decomposition and second-order difference plots

  • Ram Bilas Pachori
    ,
  • David Hewson
    ,
  • Hichem Snoussi
    ,
  • Jacques Duchêne
  • International Institute of Information Technology Hyderabad
    ,
  • Université de technologie de Troyes
Research Output: Chapter in Book/Report/Conference proceeding Conference contribution Peer-review

Abstract

This paper presents a new method for analysis of center of pressure (COP) signals using empirical mode decomposition (EMD). The EMD decomposes a COP signal into a finite set of band-limited signals termed as intrinsic mode functions (IMFs). Thereafter, a signal processing technique used in continuous chaotic modeling is used to investigate the difference between experimental conditions on the summed IMFs. This method is used to detect the degree of variability from a second-order difference plot, which is quantified using a Central Tendency Measure (CTM). Seventeen subjects were tested under eyes open (EO) and eyes closed (EC) conditions, with different vibration frequencies applied for the EC condition in order to provide additional sensory perturbation. This study has demonstrated an effective way to differentiate vibration frequencies by combining EMD and second-order difference (SOD) plots.

Publication Information

Output type

Research Output: Chapter in Book/Report/Conference proceeding Conference contribution Peer-review

Original language

English

Publication milestones

  • Published - 26/05/2009

Publication status

Published - 26/05/2009

Publisher

Institute of Electrical and Electronics Engineers Inc., United States

External Publication IDs

  • handle.net: 10547/623470
  • Scopus: 70349459780

Host publication title

2009 IEEE International Conference on Acoustics, Speech and Signal Processing

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