COMPARISON OF TWO METHODS FOR DEMODULATION OF PULSE SIGNALS – APPLICATION IN CASE OF CENTRAL SLEEP APNEA
Keywords:Optical pulse signal, AM-FM demodulation, Singular Spectrum Analysis (SSA), Singular Value Decomposition (SVD), Principal or Independent Component Analysis (PCA or ICA), Heart and Respiratory Rates
AbstractIn the field of 24/7 human health monitoring, pervasive computing makes possible the continuous analysis of physiological parameters from an ambulatory device with a great acceptability. This paper presents two methods for obtaining cardiac and respiratory rates from a single arterial pressure signal: AM-FM demodulation and Singular Spectrum Analysis (SSA). With the aim to monitor sleep apnea, two simulated central sleep apnea were performed and recorded with Biopac reference system. The results showed a good evaluation of the cardiac rate with Singular Spectrum Analysis and bad results with AM-FM demodulation. For the respiration rate, some other signals were tested with average results for both methods. Further experiments will deal with real sleep apnea cases and algorithm improvements.
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