Průměrná hodnota

$$\begin{array}{rlr}Avg\{x[n]\}& =\frac{1}{N_2-N_1+1}\sum _{n=N_1}^{N_2}x[n]& =\underset{N\to \infty }{\lim }\frac{1}{2N+1}\sum _{n=-N}^{N}x[n]\\ Avg\{x(t)\}& =\frac{1}{T_2-T_1}\int {T_1}^{T_2}x(t)dt& =\underset{T\to \infty }{\lim }\frac{1}{2T}\int {-T}^{T}x(t)dt\end{array}$$