When Interpolation-Induced Reflection Artifact Meets Time-Frequency Analysis.
While extracting the temporal dynamical features based on the time-frequency analyses, like the reassignment and synchrosqueezing transform, attracts more and more interest in biomedical data analysis, we should be careful about artifacts generated by interpolation schemes, in particular when the sampling rate is not significantly higher than the frequency of the oscillatory component we are interested in.We formulate the problem called the reflection effect and provide a theoretical justification of the statement. We also show examples in the anesthetic depth analysis with clear but undesirable artifacts.The artifact associated with the reflection effect exists not only theoretically but practically as well. Its influence is pronounced when we apply the time-frequency analyses to extract the time-varying dynamics hidden inside the signal.We have to carefully deal with the artifact associated with the reflection effect by choosing a proper interpolation scheme.
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Related Subject Headings
- Signal Processing, Computer-Assisted
- Respiration
- Humans
- Heart Rate
- Electrocardiography
- Biomedical Engineering
- Artifacts
- Anesthesia
- 4603 Computer vision and multimedia computation
- 4009 Electronics, sensors and digital hardware
Citation
Published In
DOI
EISSN
ISSN
Publication Date
Volume
Issue
Start / End Page
Related Subject Headings
- Signal Processing, Computer-Assisted
- Respiration
- Humans
- Heart Rate
- Electrocardiography
- Biomedical Engineering
- Artifacts
- Anesthesia
- 4603 Computer vision and multimedia computation
- 4009 Electronics, sensors and digital hardware