IIR Band Pass Filter Design for Signal Noise Cancellation

I have an EMG signal and I wolud like to Supress the noise by using Filter.The Filter is Butterworth Band Pass filter with cut-off frequency is 5Hz and 375Hz.I wolu like to know How to design a filter to apply on the EMG signal.

Answer 1

[Sulaymon Eshkabilov]

This is quite stratightforward issue. You can design a band-pass filter using the help given here: https://www.mathworks.com/help/signal/ref/butter.html

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fs = 5e3;  % Sampling frequency of your signal
n = 3;     % Filter ORDER. Be careful while choosing it  
Wn = [5 375]/fs;     % Frequency band-pass
ftype = 'bandpass';
% Transfer Function Design
[b,a] = butter(n,Wn,ftype);     
t=linspace(0, 1, fs);
S = 2.3*sin(2*pi*5*t)+.5*sin(2*pi*375*t)+1.25*sin(2*pi*475*t);  % It has 3 freq components, viz. 5, 375, 475 Hz
SF = filter(b,a,S);
plot(t, S, 'r'), hold on; grid on
plot(t, SF, 'b'), legend('Raw data', 'Filtered data with band-pass filter', 'location', 'best')                
xlabel('time, [sec]'),
ylabel('Signal Magnitude')

[C PRASAD]

Thanks for the Response

[Sulaymon Eshkabilov]

Most welcome!