峰-峰值

峰值

均值

均方值

${{\rm X}}_{p-p}=\max \left\{{\rm X}\left(t\right)\right\}-\min \left\{{\rm X}\left(t\right)\right\}$

${{\rm X}}_p={\left|{\rm X}\left(t\right)\right|}_{\max }$

${\mu }_x\left(t\right)=\underset{N\to \infty }{\lim }\frac{1}{N}{\displaystyle \sum _{i=1}^N{x}_i\left(t\right)}=E\left[X\left(t\right)\right]$

${\psi }_x{}^2\left(t\right)=\underset{N\to \infty }{\lim }\frac{1}{N}{\displaystyle \sum _{i=1}^N{x}_i{}^2\left(t\right)}=E\left[X^2\left(t\right)\right]$