Fourier transform

From Class Wiki
Revision as of 09:29, 8 December 2004 by Guenan (talk | contribs)

Jump to: navigation, search

An initially identity that is useful: 

x(t)=\int_{-\infty}^{\infty} x(t) e^{-j2\pi ft}\, dt

Suppose that we have some function, say  \beta (t) , that is nonperiodic and finite in duration.
This means that  \beta(t)=0 for some  T_\alpha < \left | t \right |