Fig. 6From: An effective frequency-domain feature of atrial fibrillation based on time–frequency analysisTime-domain features. There are three kinds of features in the image. For the mean of RR interval, sinus rhythm signals were larger than AF signals. For the variance of RR interval, AF ECG signals were a little larger than sinus rhythm signals. For the number of RR intervals, AF signals were more than sinus rhythm signalsBack to article page