I want to remove noisy frequencies from a data signal. But, I'm not sure the frequencies of the noise.
I tried fft, but the signal is very single sided, so can't read the specific frequencies from the graph we obtain from the following.
x = Data(:,2)
y = fft(x);
n = length(x); % number of samples
f = (0:n-1)*(fs/n); % frequency range
power = abs(y).^2/n; % power of the DFT
How do we find the specific frequencies of noise from a signal?