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Open AccessArticle

A Real Time QRS Detection Algorithm Based on ET and PD Controlled Threshold Strategy

School of Physics and Technology, Wuhan University, Wuhan 430072, China
Author to whom correspondence should be addressed.
Sensors 2020, 20(14), 4003;
Received: 19 June 2020 / Revised: 12 July 2020 / Accepted: 13 July 2020 / Published: 18 July 2020
(This article belongs to the Special Issue Artificial Intelligence in Medical Sensors)
As one of the important components of electrocardiogram (ECG) signals, QRS signal represents the basic characteristics of ECG signals. The detection of QRS waves is also an essential step for ECG signal analysis. In order to further meet the clinical needs for the accuracy and real-time detection of QRS waves, a simple, fast, reliable, and hardware-friendly algorithm for real-time QRS detection is proposed. The exponential transform (ET) and proportional-derivative (PD) control-based adaptive threshold are designed to detect QRS-complex. The proposed ET can effectively narrow the magnitude difference of QRS peaks, and the PD control-based method can adaptively adjust the current threshold for QRS detection according to thresholds of previous two windows and predefined minimal threshold. The ECG signals from MIT-BIH databases are used to evaluate the performance of the proposed algorithm. The overall sensitivity, positive predictivity, and accuracy for QRS detection are 99.90%, 99.92%, and 99.82%, respectively. It is also implemented on Altera Cyclone V 5CSEMA5F31C6 Field Programmable Gate Array (FPGA). The time consumed for a 30-min ECG record is approximately 1.3 s. It indicates that the proposed algorithm can be used for wearable heart rate monitoring and automatic ECG analysis. View Full-Text
Keywords: electrocardiogram (ECG); exponential transform (ET); PD-control; QRS detection; real-time electrocardiogram (ECG); exponential transform (ET); PD-control; QRS detection; real-time
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Chen, A.; Zhang, Y.; Zhang, M.; Liu, W.; Chang, S.; Wang, H.; He, J.; Huang, Q. A Real Time QRS Detection Algorithm Based on ET and PD Controlled Threshold Strategy. Sensors 2020, 20, 4003.

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