Figure 3
Demonstration of signal extraction in a simulated 37 Hz SSAEF using EEMD, CEEMD and band-pass filtering. a The simulation of a modulated 37 Hz SSAEF with −1 dB SNR. b, c The SSAEFs reconstructed by the summation of IMF2 and IMF3 using EEMD and CEEMD with ensemble number equal to 1,000 times, respectively. d The SSAEF extracted by 35–39 Hz band-pass filtering.