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Title:
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A sampling limit for the empirical mode decomposition |
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Author:
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Stevenson, N; Mesbah, M; Boashash, B
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Abstract:
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The aim of this paper is to investigate the effect of sampling
on the empirical mode decomposition (EMD). To this end,
an experiment utilising linear frequency modulated (LFM)
signals was used to simulate different sampling rates. This
experiment showed that as the frequency content of the signal
(fc) approached the sampling frequency (fs) the EMD
performed poorly due to poor amplitude resolution. This
led to a definition of a sampling limit that was 5 times the
Nyqvist rate (fs/10) to improve the performance of the EMD.
Comparative simulation with this sampling limit was conducted
on a simulated and a real world signal. The results
exhibited significant improvement in intrinsic mode function
(IMF) orthogonality, the distribution of IMF energy and
IMF coherence. |
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Description:
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(The most recent upgrade of the original software package that calculates Time-Frequency Distributions and Instantaneous Frequency estimators can be downloaded from the web site: www.time-frequency.net. This was the first software developed in the field, and it was first released publicly in 1987 at the 1st ISSPA conference held in Brisbane, Australia., and then continuously updated). |
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URI:
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http://hdl.handle.net/10576/10727
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Date:
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2005-08 |