ECG signals are often contaminated with EMG signal (90-150Hz) or power line nois
ID: 124294 • Letter: E
Question
ECG signals are often contaminated with EMG signal (90-150Hz) or power line noise (60Hz). Given a noisy ECG signal, design a filter to remove the noise present in the signal.
Load the “ECG.mat” file that contains data for a noisy ECG signal. The sampling frequency is 1024 Hz. The ECG reading was done in mV. Using a subplot plot the signal vs. time and the amplitude of the Fourier transform for frequency values up to the Nyquist frequency. On the frequency domain plot, identify the peaks corresponding to the signal, power line noise, and EMG contamination using an annotation. What is the approximate signal bandwidth of the actual ECG signal?
B ) What kind of filter would be most useful to eliminate both sources of signal contamination? What frequency range should pass through this filter (passband)? At what frequency should you
start filtering out singal (stopband)? Assigning a passband attenuation of .5 dB and a stopband attenuation of 1 dB, use the built in commands buttord(), butter(), and tf() to generate an analog transfer function for your filter. Display the transfer function.
C. Find the roots of your transfer function using the built in command roots and display them. Use the built in command pzmap() to plot the poles and zeros of your transfer function. How many poles are there? How many zeros? Does this correspond to what you would expect based on your transfer function and roots calculation? Why or why not?
Use the built in command bodeplot() to plot the magnitude and phase of your transfer function.
Your transfer function is currently analog, so you will need to do an analog to digital conversion
to apply it to your signal. Use the built in command bilinear() to convert your transfer function and the built in command filter() to apply it to your signal. Using a subplot plot the filtered signal vs. time and the amplitude of the Fourier transform for frequency values up to the Nyquist frequency. What differences do you notice in the signal? What changes do you see in the plot of amplitude?
Explanation / Answer
Electrocardiogram (ECG)
An ECG is a standout amongst the most well-known heart tests. It is the main method for revealing certain issues with the heart's electrical motivations. There are various reasons why somebody may have an ECG, including an unpredictable pulse, shortness of breath when they endeavor, altogether hypertension, palpitations or a presumed heart valve issue. It can likewise be a valuable method for decision out issues. On the off chance that your specialist suggests an ECG, consider it a fundamental examination.
What do the test engross
The ECG is a straightforward test, with 10 cathodes used to record 12 unique perspectives of your heart's electrical action. You don't have to successfully get ready for it. A cathode is connected to every lower leg and wrist with sticky cushions and six more are appended to the chest. The patient lies level with the head and chest raised a bit. Unwinding for a couple of minutes before the chronicle is made is imperative, as this enables the terminal associations with balance out and implies the ECG will be more dependable. Amid this time, your points of interest can be recorded on the ECG machine.
latest developments in this area
There have been progresses in scaling down ECG hardware, especially for long haul ECG recording. The term 'wearables' now depicts, for instance, a firmly fitting T-shirt with ECG terminals worked in so it can be worn amid donning or other day by day exercises while an ECG is recorded. Different gadgets record just a solitary lead of an ECG utilizing a cell phone. They might be valuable for a patient with a discontinuous issue, so they can record the occasion effortlessly when it happens.
Computers help doctors to infer ECGs
it is conceivable to incorporate programming with an ECG machine to give a translation of cadence, conduction variations from the norm and different types of ECG irregularity, for example, extension of the heart. ECG comes about are subject to age, sex and race. The PC can store typical points of confinement in light of these elements, and no less than, a robotized ECG understanding gives your specialist a moment conclusion.
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