MATLAB: Program to Design a filter using fdatool to remove noise(50Hz) from a ECG signal

ecgfdatool

How to remove a noise from an ecg signal

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See: Remove the 60 Hz Hum from a Signal. Just change the frequency of the notch.

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MATLAB: Plotting ECG signals

doc fft %the documentation example is very good

Good filtering example

ECG generator

Very simple example how to add noise to a wave:

t=0:0.1:10; %from 0 to 10 seconds, sampling 0.1 seconds
y=sin(t); %measured amplitude
n=0.1*rand(1,numel(t)); %noise to add
plot(x,y+n)

MATLAB: Design band pass filter

Here is prototype code I used for a different project that you can adapt, if you want an IIR filter:

Fs = 250;                                                       % Sampling Frequency
Fn = Fs/2;                                                      % Nyquist Frequency
Ts = 1/Fs;                                                      % Estimate Sampling Interval
t = linspace(0, numel(EKG), numel(EKG))/Fs;
Wp = [2  90]/Fn;                                                % Normalised Passband (Passband =  2 Hz To  90 Hz)
Ws = [1 100]/Fn;                                                % Normalised Stopband (Passband =  1 Hz To 100 Hz)
Rp =  1;                                                        % Passband Ripple/Attenuation
Rs = 50;                                                        % Stopband Ripple/Attenuation
[n,Wp] = ellipord(Wp, Ws, Rp, Rs);                              % Calculate Elliptic Filter Optimum Order
[z,p,k] = ellip(n, Rp, Rs, Wp,'bandpass');                      % Elliptic Filter
[sos,g] = zp2sos(z,p,k);                                        % Convert To Second-Order-Sections For Stability
figure
freqz(sos,2^16,Fs)
filtered_signal = filtfilt(sos,g,signal);

There are a number of FIR designs on Answers as well (I have posted many of them), although I usually reserve those for filters with multiple passbands and stopbands.

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MATLAB: Plotting ECG signals

MATLAB: Design band pass filter

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