\documentclass{scrartcl}
\usepackage{color}
\usepackage{multicol}
\usepackage[final]{graphicx}
\usepackage{pst-plot,pstricks}
	\input{pstplot-logarithmic-axes}
\begin{document}
	\psset{xunit=1cm,yunit=3cm}
	\begin{pspicture}(-0.5,-0.25)(5,1.5)
		\psgrid[xunit=1,yunit=1,subgriddiv=0,griddots=5,gridlabels=0](0,0)(5,1.5)
		\psaxes[Dx=6,Dy=0.5]{->}(0,0)(-0.5,-0.25)(5,1.5)
		\psplot[plotstyle=curve]{0}{4}{x 90 mul sin x 90 mul sin mul}
		\rput[r](-0.3,1.5){$\left|\underline{H}\left(j\omega\right)\right|$}
		\rput(2,-0.2){$\frac{2\pi}{\tau}$}
		\rput(4,-0.2){$\frac{4\pi}{\tau}$}
	\end{pspicture}
\end{document}
