7. • used in the extraction of vital
characteristic parameters.
How signal processing important in ECG?
• When an electrical potential is
generated in a section of the
heart, an electrical current is
conducted to the body
surface in a specific area.
How ECG operates?
8. Matlab Functionality in ECG
• Fast Fourier Transform (FFTs)
• Filter
- extraction of relevant signal.
• Stem graphs
9. The major sources of noise
1. Power line interference
2. Muscle contractions
3. Electrode contact noise
4. Motion Artifacts
5. Baseline wandering
6. Noise generated by electronic devices
used in signal processing circuits
7. Electrical interference external to the
subject and recording system
8. High-frequency noises in the ECG
9. Breath, lung, or bowel sounds
contaminating the heart sounds (PCG).
11. How ECG works.
An ECG signal is due to ionic current flow
causing the cardiac fibers to contract
and relax, subsequently, generating a
time variant periodic signal
the potential difference between two
electrodes placed on the skin surface is
considered as an input to the ECG
plotter
12. Mother Wavelet
applied for denoising of the ECG signal
retains the signal peaks close to their full
amplitude
Wavelet Theory
signal compression
feature extraction
small extent in denoising
Noise Solutions
13. ECG Signal Processing aims
artefact reduction
ECG signals cleaner
better interpretable
at revealing aspects not immediately
observable
at diagnostics decision support and
automated ECG signal interpretation
