Open Access
ARTICLE
An Improved Lung Sound De-noising Method by Wavelet Packet Transform with Pso-Based Threshold Selection
Qing-Hua Hea, Bin Yub, Xin Honga, Bo Lva, Tao Liub, Jian Ranb, Yu-Tian Bia
a State Key Laboratory of Trauma, Burns and Combined Injury, Daping Hospital, Surgery Institute of the Third Military Medical University, Chongqing 400042, China;
b College of Communication Engineering, Chongqing University, Chongqing 400044, China
* Corresponding Author: Yu-Tian Bi,
Intelligent Automation & Soft Computing 2018, 24(2), 223-230. https://doi.org/10.1080/10798587.2016.1261957
Abstract
Lung abnormalities and respiratory diseases increase with the development of urban life. Lung sound
analysis provides vital information of the present condition of the pulmonary. But lung sounds are
easily interfered by noises in the transmission and record process, then it cannot be used for diagnosis
of diseases. So the noised sound should be processed to reduce noises and to enhance the quality of
signals received. On the basis of analyzing wavelet packet transform theory and the characteristics of
traditional wavelet threshold de-noising method, we proposed a modified threshold selection method
based on Particle Swarm Optimization (PSO) and support vector machine (SVM) to improve the quality
of the signal, which has been polluted by noises. Experimental results show that the recognition
accuracy of de-noised lung sounds by the improved de-noising method is 90.03%, which is much
higher than by the other traditional de-noising methods. Meanwhile, the lung sound processed by
the proposed method sounds better than by other methods. All results make it clear the modified
threshold selection can obtain a better threshold vector and improve the quality of lung sounds.
Keywords
Cite This Article
Q. He, B. Yu, X. Hong, B. Lv, T. Liu
et al., "An improved lung sound de-noising method by wavelet packet transform with pso-based threshold selection,"
Intelligent Automation & Soft Computing, vol. 24, no.2, pp. 223–230, 2018. https://doi.org/10.1080/10798587.2016.1261957