CAJ | 학술논문

为了消去夹杂在膈肌肌电(EMGdi)信号中的心电干扰,在比例阈值算法的基础上,提出一种结合QRS检测和小波阈值的降噪方法.首先,根据小波系数的相关性构造QRS波群的检测方法,分析确定干扰的位置和范围;其次,将小波系数分为受干扰和未受干扰两部分,并构造相应的阈值算法,针对性地处理受干扰系数,以未受干扰部分系数作为阈值算法构造的依据;最后,重构处理后的小波系数,得到降噪后的EMGdi信号.对临床采集信号的处理对比表明,该方法能够更为有效地去除心电干扰,并更好地保留EMGdi的有用信号.
위료소거협잡재격기기전(EMGdi)신호중적심전간우,재비례역치산법적기출상,제출일충결합QRS검측화소파역치적강조방법.수선,근거소파계수적상관성구조QRS파군적검측방법,분석학정간우적위치화범위;기차,장소파계수분위수간우화미수간우량부분,병구조상응적역치산법,침대성지처리수간우계수,이미수간우부분계수작위역치산법구조적의거;최후,중구처리후적소파계수,득도강조후적EMGdi신호.대림상채집신호적처리대비표명,해방법능구경위유효지거제심전간우,병경호지보류EMGdi적유용신호.
In order to eliminate the ECG interference included in diaphragmatic electromyographic (EMGdi), an ECG cancellation algorithm based on proportional threshold algorithm was presented in this paper.The algorithm combined QRS detection and wavelet threshold.Firstly, a QRS detection was made by the correlation of wavelet coefficients.Secondly, the wavelet coefficients were divided into noised and clean part.The former was processed by improved threshold algorithm, while the latter was used to construct the threshold.Lastly, the denoised signals were reconstructed by wavelet coefficients.The result of clinical signals processing showed that the proposed algorithm eliminated the ECG interference in EMGdi availably and reserved EMGdi useful signal effectively as well.