Contents
How do you remove motion artifacts from ECG?
An existing method to remove the motion artefact is to employ an accelerometer for measuring the body movement at the same time of ECG detection [5]. However, for non-contact electrode structure of ECG detection, an accelerometer directly attached to the human body is unacceptable.
What is a noisy ECG?
Mainly two types of noises are present in the ECG signal. Noises with high frequency include Electromyogram noise, Additive white Gaussian noise, and power line interference. Noises with low frequency include baseline wandering. The noises contaminated in the ECG signal may lead wrong interpretation.
What is the effect of motion artifacts in ECG recordings?
Electrocardiographic artifacts are defined as electrocardiographic alterations, not related to cardiac electrical activity. As a result of artifacts, the components of the electrocardiogram (ECG) such as the baseline and waves can be distorted. Motion artifacts are due to shaking with rhythmic movement.
What are the normal ECG readings?
Normal ECG values for waves and intervals are as follows:
- RR interval: 0.6-1.2 seconds.
- P wave: 80 milliseconds.
- PR interval: 120-200 milliseconds.
- PR segment: 50-120 milliseconds.
- QRS complex: 80-100 milliseconds.
- ST segment: 80-120 milliseconds.
- T wave: 160 milliseconds.
How can I remove wander noise from my ECG?
Baseline wander is a low-frequency noise of around 0.5 to 0.6 Hz. To remove it, a high-pass filter of cut-off frequency 0.5 to 0.6 Hz can be used. Powerline interference (50 or 60 Hz noise from mains supply) can be removed by using a notch filter of 50 or 60 Hz cut-off frequency.
Is there a high pass filter for ECG?
Conventional high pass filtering essentially fails since the ECG has a frequency spectrum that overlaps markedly with that of the surface EMG signal of the upper trunk muscles [3]. The gating method, perhaps the loss of the portions of the EMG signals overlying QRS complexes.
What causes a distortion in the surface EMG signal?
A major difficulty during analysis of surface EMG signal is electrocardiogram (ECG) contamination. This causes an increase in the power content of the EMG signal and a distortion of its frequency content [2]. Generally, the ECG interference is large in amplitude and overlapped with the frequency of the EMG [3].
How to remove ECG artifact from the surface EMG signal?
A method based on the combined use of wavelet transform and ICA is presented in [5]. In this paper, the adaptive subtraction technique has been studied to remove ECG interference from the surface EMG signal of the upper trunk muscles.