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Estimation of analogue pre-filtering characteristics for CORSA standardisation
X Q Sun1, B M Cheetham, K G Evans
1Department of Electrical Engineering and Electronics, Liverpool University, UK.
Summary
This study proposes a simple method to measure the impact of high-pass filters on pulmonary signals. Accurate filter characterization is crucial for analyzing digitized respiratory data.
Area of Science:
- Biomedical Engineering
- Signal Processing
- Respiratory Physiology
Background:
- Pulmonary signal digitization requires pre-processing using analogue filters.
- High-pass filtering significantly alters time-domain wave-shapes of digitized pulmonary signals.
- Accurate analysis of respiratory data necessitates accounting for filter effects.
Purpose of the Study:
- To develop a standard procedure for characterizing analogue filter responses.
- To quantify the gain and phase responses of filters used in pulmonary signal pre-processing.
- To provide an easily implementable measurement method for laboratory use.
Main Methods:
- Investigated various methods to determine the effects of high-pass filtering.
- Proposed a novel measurement procedure for filter response determination.
- Utilized simple laboratory equipment for the proposed measurement technique.
Main Results:
- Established a standard procedure for determining analogue filter gain and phase responses.
- Demonstrated the significant impact of high-pass filtering on pulmonary signal wave-shapes.
- Validated the proposed measurement procedure using basic laboratory apparatus.
Conclusions:
- The proposed procedure offers a reliable and accessible method for filter characterization.
- Accurate assessment of filter effects is essential for precise pulmonary signal analysis.
- Standardized filter response measurement improves the reliability of digitized respiratory data.