Fig. 1From: Instantaneous phase difference analysis between thoracic and abdominal movement signals based on complementary ensemble empirical mode decompositionAn illustration to the procedure of CEEMD. The left part of the figure shows the flow chart of CEEMD and the right part shows the instance of sample signals, sample envelope signals (red line for upper envelope, blue line for lower envelope, and green line for mean envelope), and the sample of the extracted signalsBack to article page