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. 2024 Oct 16;16:1623–1636. doi: 10.2147/NSS.S480687

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© 2024 Kabir et al.

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Extraction of heart sounds (HS), S1 (marked as pink) and S2 (marked as black) from tracheal sound (TS) recorded by the Patch (A) attached to participant’s suprasternal notch (B) during (C) normal breathing and (D) snoring (shaded red in TS). ECG is recorded from PSG. Tracheal sound containing segments of either (C) normal breathing (marked as brown in TS representing inhalation and exhalation) or (D) snoring (marked as red).