Related Experiment Video
Updated: Jun 27, 2026
10:23
Equipment Setup and Artifact Removal for Simultaneous Electroencephalogram and Functional Magnetic Resonance Imaging for Clinical Review in Epilepsy
Published on: June 23, 2023
[Research of adaptive notch filter based on QRD-LS algorithm for power line interference in ECG]
Shuyan Wang1, Jian Dong, Xin Guan
1Tianjin Key Lab for Advanced Signal Processing, Civil Aviation University of China, Tianjin 300300, China. wsylcq@163.com
Summary
This study introduces an adaptive notch filter using the QRD-LS algorithm to remove power line interference from ECG signals. The new method offers improved robustness and performance over the LMS algorithm for clearer heart signal analysis.
Area of Science:
- Biomedical Engineering
- Signal Processing
Context:
- Electrocardiogram (ECG) signals are crucial for diagnosing cardiac conditions.
- Power line interference (PLI) is a common artifact that degrades ECG signal quality.
- Existing methods like the Least Mean Square (LMS) algorithm have limitations in robustness.
Purpose:
- To develop and evaluate an adaptive notch filter for effective PLI removal in ECG.
- To improve the signal-to-interference ratio (SIR) of ECG recordings.
- To enhance the robustness and performance of ECG filtering techniques.
Summary:
- An adaptive notch filter utilizing the QR-Decomposition Least-Squares (QRD-LS) algorithm is presented for PLI elimination in ECG.
- The QRD-LS algorithm, employing recursive least-squares minimization with systolic arrays, adjusts the filter's weight vector.
- Simulations demonstrate that the QRD-LS adaptive notch filter significantly outperforms the conventional LMS-based filter in terms of robustness and performance.
Impact:
- Enables more accurate and reliable ECG analysis by removing noise.
- Enhances diagnostic capabilities for cardiovascular diseases.
- Provides a more robust filtering solution for clinical and wearable ECG monitoring systems.
Related Concept Videos
01:23Parallel Resonance
The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
01:25Instrumentation Amplifier
An electrocardiography (ECG) machine is an essential piece of medical equipment used to monitor the electrical activity of the heart. It operates by detecting small electrical changes on the skin that result from the depolarization of the heart muscle during each heartbeat. However, these signals are in the microvolt range and can be easily overwhelmed by noise or interference.
To overcome this challenge, an ECG machine utilizes an instrumentation amplifier. This specialized amplifier is...
To overcome this challenge, an ECG machine utilizes an instrumentation amplifier. This specialized amplifier is...
01:26Linear Approximation in Frequency Domain
Linear systems are characterized by two main properties: superposition and homogeneity. Superposition allows the response to multiple inputs to be the sum of the responses to each individual input. Homogeneity ensures that scaling an input by a scalar results in the response being scaled by the same scalar.
In contrast, nonlinear systems do not inherently possess these properties. However, for small deviations around an operating point, a nonlinear system can often be approximated as linear.
In contrast, nonlinear systems do not inherently possess these properties. However, for small deviations around an operating point, a nonlinear system can often be approximated as linear.