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Fig. 9 | EURASIP Journal on Advances in Signal Processing

Fig. 9

From: Localization and classification of heart beats in phonocardiography signals —a comprehensive review

Fig. 9

Low-, mid-band, and high-frequency band extraction of S1 using wavelet transform. a S1 beat extracted using rectangular and hamming window with approximation. b S1 beat: high-frequency component extracted using wavelet transform. c S1 beat: mid-band frequency component extracted using wavelet transform. d S1 beat: low-frequency component extracted using wavelet transform

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