# Autocorrelation of an AR model

When I plot the autocorrelation function of an autoregressive signal, I get this instead of a damping sinusoid.

I am having trouble understanding why this is happening. My signal is an generated from an AR(10) model.

• It looks to me like a sum of damped sinusoids. You have, depending on how you define AR(10) 9 or 10 poles – Stanley Pawlukiewicz Aug 15 at 23:19