next up previous
Next: Four Forms of Fourier Up: Fourier_Analysis Previous: Continuous Fourier Transform

Discrete Fourier Transform

In practice, the expression $x(t)$ of the signal is not available, so the signal has to be digitized (truncated and sampled) and then analyzed numerically by a digital computer.

Alternatively, the truncation and sampling of the discretization process can be carried out in a different order, sampling first followed by truncation.


next up previous
Next: Four Forms of Fourier Up: Fourier_Analysis Previous: Continuous Fourier Transform
Ruye Wang 2003-11-17