Single-Channel Adaptive Noise Canceller for Heart Sound Enhancement during Auscultation

Yunjung LEE  Pil Un KIM  Jin Ho CHO  Yongmin CHANG  Myoung Nam KIM  

IEICE TRANSACTIONS on Information and Systems   Vol.E95-D   No.10   pp.2593-2596
Publication Date: 2012/10/01
Online ISSN: 1745-1361
DOI: 10.1587/transinf.E95.D.2593
Print ISSN: 0916-8532
Type of Manuscript: LETTER
Category: Biological Engineering
heart sound,  adaptive noise canceller,  signal enhancement,  auscultation,  noise reduction,  

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In this paper, a single-channel adaptive noise canceller (SCANC) is proposed to enhance heart sounds during auscultation. Heart sounds provide important information about the condition of the heart, but other sounds interfere with heart sounds during auscultation. The adaptive noise canceller (ANC) is widely used to reduce noises from biomedical signals, but it is not suitable for enhancing auscultatory sounds acquired by a stethoscope. While the ANC needs two inputs, a stethoscope provides only one input. Other approaches, such as ECG gating and wavelet de-noising, are rather complex and difficult to implement as real-time systems. The proposed SCANC uses a single-channel input based on Heart Sound Inherency Indicator and reference generator. The architecture is simple, so it can be easily implemented in real-time systems. It was experimentally confirmed that the proposed SCANC is efficient for heart sound enhancement and is robust against the heart rate variations.