A Novel AMARS Technique for Baseline Wander Removal Applied to Photoplethysmogram

A new digital filter, AMARS (aligning minima of alternating random signal) has been derived using trigonometry to regulate signal pulsations inline. The pulses are randomly presented in continuous signals comprising frequency band lower than the signal's mean rate. Frequency selective filters a...

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Bibliographic Details
Published in:IEEE transactions on biomedical circuits and systems 2017-06, Vol.11 (3), p.627-639
Main Authors: Timimi, Ammar A. K., Mohd Ali, M. A., Chellappan, K.
Format: Article
Language:English
Subjects:
Algorithms
Alignment
Band-pass filters
Baseline wander removal (BWR)
biomedical transducer
Blood volume
cubic spline interpolation
Data processing
digital volume pulse (DVP)
Ear
Electrocardiography
Filters
Finite impulse response filters
Frequency modulation
frequency selective filters
Humans
Interpolation
linear interpolation
Minima
photoplethysmography (PPG)
Plethysmography
PPG signal processing
Shape
Signal Processing, Computer-Assisted
slope trigonometry
Structure-function relationships
synthetic BW
synthetic PPG
Trigonometry
Volatility
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Summary:A new digital filter, AMARS (aligning minima of alternating random signal) has been derived using trigonometry to regulate signal pulsations inline. The pulses are randomly presented in continuous signals comprising frequency band lower than the signal's mean rate. Frequency selective filters are conventionally employed to reject frequencies undesired by specific applications. However, these conventional filters only reduce the effects of the rejected range producing a signal superimposed by some baseline wander (BW). In this work, filters of different ranges and techniques were independently configured to preprocess a photoplethysmogram, an optical biosignal of blood volume dynamics, producing wave shapes with several BWs. The AMARS application effectively removed the encountered BWs to assemble similarly aligned trends. The removal implementation was found repeatable in both ear and finger photoplethysmograms, emphasizing the importance of BW removal in biosignal processing in retaining its structural, functional and physiological properties. We also believe that AMARS may be relevant to other biological and continuous signals modulated by similar types of baseline volatility.
ISSN:1932-4545
1940-9990
DOI:10.1109/TBCAS.2017.2649940