Źródło TeX:

W\left(\tau,\sigma\right)=:\int_{-\infty}^{+\infty}{x\left(t\right)\overline{\psi_{\tau,\sigma}\left(t\right)}}dt\begin{matrix},&\psi_{\tau,\sigma}\left(t\right)=\frac{1}{\sqrt\sigma}\psi\frac{t-\tau}{\sigma}\\\end{matrix}