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FFT averaging of multichannel BCG signals from bed mattress sensor to improve estimation of heart beat interval

A multichannel pressure sensing Emfit foil was integrated to a bed mattress for measuring ballistocardiograph signals during sleep. We calculated the heart beat interval with cepstrum method, by applying FFT for short time windows including pair of consequent heart beats. We decreased the variance o...

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Bibliographic Details
Published in:2007 29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society 2007-01, p.6685-6688
Main Authors: Kortelainen, J.M., Virkkala, J.
Format: Article
Language:English
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Summary:A multichannel pressure sensing Emfit foil was integrated to a bed mattress for measuring ballistocardiograph signals during sleep. We calculated the heart beat interval with cepstrum method, by applying FFT for short time windows including pair of consequent heart beats. We decreased the variance of FFT by averaging the multichannel data in the frequency domain. Relative error of our method in reference to electrocardiograph RR interval was only 0.35% for 15 night recordings with six normal subjects, when 12% of data was automatically removed due to movement artifacts. Background motivation for this work is given from the studies applying heart rate variability for the sleep staging.
ISSN:1094-687X
1558-4615
DOI:10.1109/IEMBS.2007.4353894