Talk:Wiener–Khinchin theorem
The second equation in this article defines the autocovariance of a stationary process, not the autocorrelation; it's needs to be normalized by dividing by the time 0 autocovariance, or just the variance of the process.
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The second equation in this article defines the autocovariance of a stationary process, not the autocorrelation; it's needs to be normalized by dividing by the time 0 autocovariance, or just the variance of the process.