Hello, 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 %Generate Coloured Noise n_out = filter(b,a,n_white); % filtering operation produces coloured noise Is this correct? Because, according to my simulation, i have a bias of some 40dB between my analytical calculation and simulation. Thanks for all answers! :-) Dilpreet

# Filtering White noise to produce desired Coloured Noise

Started by ●November 1, 2007