removing blink peaks from a signal

Does anyone know how to program a system to be developed that automatically isolates all the blinks (large peaks) from a signal and saves the cleaned signal to a specific variable. And then how to plot the signal before and after blink isolation alongside with their spectrum (before/after) and save the spectrums to specific variables.

Thank you

Answer 1

[Deepak Kumar]

You can use "findpeaks" function in MATLAB to final the local maxima (peaks) of the input signal vector. The below documentation link gives the detailed description about "findpeaks" function.

https://in.mathworks.com/help/signal/ref/findpeaks.html#d117e66067

The below example code snippet extracts the peak from the signal and plot them before and after peak extraction. In the code I have extracted the peaks from the signal and subtracted it from the original signal. So the peak values are now replaced by zeros.

fs=1000; %Sampling frequency
t=0:1/fs:1; %time vector

y=10*sin(2*pi*10*t); % Input Signal 

figure(1)
plot(t,y) % Plot the signal before peak extraction

[pks,locs] = findpeaks(y); % returns a vector with the local maxima (peaks) of the input signal y and the indices at which the peaks occur.

x=zeros(size(y));

x(locs)=y(locs);

z=y-x; %Cleaned Signal

figure(2)
plot(t,z) % Plot the signal after peak extraction

You can use "FFT" function in MATLAB to find the spectrum of the signal. The below is the documenation link for the "FFT" function.

https://in.mathworks.com/help/matlab/ref/fft.html

[rami zaboura]

can anyone approve this answer?