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Simulated respiration signals and separation results. (a) Simulated signal, (b) and (c) two modes decompose by Variational Mode Decomposition (VMD) based algorithm; (d) time-varying respiration signals; (e) Simulated signal with −10 dB SNR, (f) and (g) two modes decompose by VMD based algorithm; (h) time-varying respiration signals.
