“…Feature extraction plays an important role in the method pipeline because this stage establishes a platform for the subsequent procedures of pattern recognition and/or machine learning. Technologies to extract ECG signal features have been studied and developed from different angles, such as description of waveform morphologies, representation of waveband statistics, quantization of wavelet coefficients, and so forth [ 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 ].…”