Detection and Adaptive Cancellation of Heart Sound Interference in Tracheal Sounds
Detection and Adaptive Cancellation of Heart Sound Interference in Tracheal Sounds
复制标题
气管音心音干扰的检测和自适应消除
DOI：
10.1109/iembs.2006.260727
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
J. Morera
中科院分区：
文献类型：
--
作者：
S. Cortes;R. Jané;A. Torres;J. Fiz;J. Morera
在呼吸音分析中，心音通常是一个严重的噪声源。在分析呼吸音时，心音的干扰很重要，因为心音的强度比呼吸声的强度大1到10倍。提出了在呼吸声分析中减少心音干扰的方法。然而，这些方法中的大多数需要获取额外的信号和心音的频谱内容的知识。本文提出了一种仅利用心音信号进行心音检测和自适应滤波的算法，使呼吸音中的失真最小化。滤波后的气管声音功率谱密度(PSD)的主要成分与原始信号的PSD相当。实验结果表明，采用自适应滤波后，心音干扰明显减小。这种滤光片可以方便地分析和更好地解释自主呼吸时的呼吸声
Heart sound is often a serious source of noise in the analysis of respiratory sounds. The interference of heart sound is important when breath sounds are analyzed, since the intensity of heart sound is 1 to 10 times greater than the intensity of breath sound. Methods to reduce heart sound interference in breath sound analysis had been suggested. However, the majority of those methods require acquisition of an additional signal and knowledge of the spectral content of heart sound. In this paper it has been proposed an algorithm for the detection and adaptive filtering of heart sounds using only the sound signal and, minimizing distortion in the respiratory sound. The main components of the power spectral density (PSD) of the filtered tracheal sound are comparable with the PSD of the original signal. The experimental results shown reduction of the heart sound interference when the adaptive filter is applied. This kind of filter could facilitate the analysis and a better interpretation of the respiratory sound during spontaneous ventilation