The basic idea here is to multiply the data train with a window
function and compute the Fourier transform. We use the Welch Window
for our Windowed Fourier transforms (WFT). The WFT is defined by the
relation,

where, is given as,

(10.1.221) | |||

(10.1.222) |

where is the width of the window.

Bruce Allen 2000-11-19