The auto-correlation function Rx(τ) of a random process

The auto-correlation function R_x(τ) of a random process has the property that R_x(0) is equal to—

1. The square of the mean value of the process
2. The mean square value of the process
3. The smallest value of the process
4. 1 [Rx(τ) + Rx(– τ)]
  2

R_x(0) = is called the mean square value of random process. Furthermore, this is maximum value of the process.

	1	[Rx(τ) + Rx(– τ)]
	2