Hi All,
I read in this book DSP with Computer Applications that the rectangular
window (used for windowing ) gives the best approximation to the desired
frequency response in a least square sense. That is, it gives the least
squared, integrated, error between the Hd(W) and Ha(W) for a given number
of impulse response terms.
where Hd(W) is the ideal response of the filter.
Ha(W) is the response of the filter after the window is used.
Can anyone explain more about this. What this actually means and why so ?
Thanks in advance.
