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How to create random noise in a signal

Started by M.L. March 13, 2006
Hi NG,

I am making an artificial signal, composed of a number of sinusoids
which reflect "real" detections/data, but I would like to get closer to
the real thing by adding some random noise to the signal. Is there a
"standard" way of doing this, provided I have access to a random number
generator?

Any ideas with regard to the actual implementation are also welcome. I
was thinking creating a number of sinusoids with random amplitude and
phase (values of which I would get as described above), and then simply
adding them to the signal. Would that work from a theoretical point of
view? Or, I guess I could also simply just add a random number to each
sample..?

Any inputs on one or the other? 

Thanks! 

Best, 

M.L.