Real-Time Restoration of Nonstationary Biomedical Signals under Additive Noises

Junichi HORI  Yoshiaki SAITOH  Tohru KIRYU  

IEICE TRANSACTIONS on Information and Systems   Vol.E82-D   No.10   pp.1409-1416
Publication Date: 1999/10/25
Online ISSN: 
Print ISSN: 0916-8532
Type of Manuscript: PAPER
Category: Medical Electronics and Medical Information
restoration,  band-limitation,  real-time,  additive noise,  redundancy,  

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In the present paper we shall examine the real-time restoration of biomedical signals under additive noises. Biomedical signals measured by instruments such as catheter manometers, ambulatory electrocardiographs and thermo-dilution sensors are susceptible to distortion and noise. Therefore, such signals must be restored to their original states. In the present study, nonstationary biomedical signals are observed and described using a mathematical model, and several restoration filters that are composed of a series of applications of this model are proposed. These filters restored band-limited approximations of the original signals in real-time. In addition, redundancy is introduced into these restoration filters in order to suppress additive noise. Finally, an optimum filter that accounts for restoration error and additive noise is proposed.