For ECG classification, fusing time and time-frequency features helps, but adding frequency features is redundant, so more modalities are not always better.
Physical laws meet machine intelligence: current developments and future directions
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Rethinking Multimodality: Optimizing Multimodal Deep Learning for Biomedical Signal Classification
For ECG classification, fusing time and time-frequency features helps, but adding frequency features is redundant, so more modalities are not always better.