I am trying to produce a coloured noise from white noise in the discrete
time domain. I do it by producing an FIR filter of coefficients b,a from
the Noise Floor (V/sqrt(Hz)), which filters white noise produced by the
randn function.
Here is the code again:
%Filter coefficients of Noise floor of circuit
[b,a] = invfreqz(PSD_N.^0.5,(2*pi/fs)*(nn_f_scale),70,0,[],20,0.01);
%Generate White Noise
n_white = randn([1 B])'; % multiply of power 1
n_white = n_white - mean(n_white); % white noise must be DC free
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