構(gòu)造多分辨率小波表征QRS綜合波的頻率分布特性
CONSTITUTING MULTIRESOLUTION WAVELET TO CHARACTERIZE QRS FREQUENCY DISTRIBUTIONS
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摘要: 本文討論了用多分辨率分析(MRA)方法構(gòu)造具有良好頻率特性的帶限正交(FLO)小波。并根據(jù)小波系數(shù)的能量在不同分辨率下的分布,定義了一種能夠反映ORS綜合波頻率成分分布的特征參數(shù)。通過對(duì)MIT心律失常數(shù)據(jù)厙中波形的測(cè)試,結(jié)果顯示室性QRS波的值通常小于正常的QRS波。并且該參數(shù),特別是采用FLO小波計(jì)算時(shí),能夠明顯區(qū)分正常和室性心搏,并有較強(qiáng)的抗干擾能力。
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關(guān)鍵詞:
- 心電圖; QRS綜臺(tái)波; 帶限正交小波; 多分辨率分析
Abstract: A frequency limited orthogonal(FLO)wavelet with expected frequency property is constituted on the basis of Multiresolution Analysis (MRA)．A parameteris defined to characterize the frequency distribution of QRS complexes．Testing on varieties of waveforms in MIT arrhythmia database shows that ventricular ORS complexes usually yield smallerthan that of normal QRS complexes．With such parameter,especially evaluated by the derived FLO wavelet，the stronger capability of classifying ventricular and normal beats can be oberved even in the noise contaminated ECG． -
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