Instantaneous frequency-time analysis of physiology signals: The application of pregnant women's radial artery pulse signals
Journal
Physica A: Statistical Mechanics and its Applications
Journal Volume
387
Journal Issue
2-3
Pages
485-494
Date Issued
2008
Author(s)
Abstract
This study used the Hilbert-Huang transform, a recently developed, instantaneous frequency-time analysis, to analyze radial artery pulse signals taken from women in their 36th week of pregnancy and after pregnancy. The acquired instantaneous frequency-time spectrum (Hilbert spectrum) is further compared with the Morlet wavelet spectrum. Results indicate that the Hilbert spectrum is especially suitable for analyzing the time series of non-stationary radial artery pulse signals since, in the Hilbert-Huang transform, signals are decomposed into different mode functions in accordance with signal's local time scale. Therefore, the Hilbert spectrum contains more detailed information than the Morlet wavelet spectrum. From the Hilbert spectrum, we can see that radial artery pulse signals taken from women in their 36th week of pregnancy and after pregnancy have different patterns. This approach could be applied to facilitate non-invasive diagnosis of fetus' physiological signals in the future. © 2007 Elsevier Ltd. All rights reserved.
SDGs
Type
journal article