Exponential window

[Christian Guenther]

Hi!

I just read the Application Note 041 by National Instruments, but there
are still some questions I have. Perhaps you can help me:
- In Labview the Exponential window is defined as y=x*exp(ai),
a=ln(f)/(n-1). f is the final value.... what's that? Normally 0, isn't
it????
- Each window like Hanning, Hamming etc. needs a scaling factor;
probably the exponential window too.? And how can I calculate this
factor?

Thanks
Christian

[LBoltzmann]

Christian,

The final value selection depends on how much damping you want to add to the signal you are windowing. More decay equates to a reduction in peak amplitudes and wider frequency peaks. A good explanation of the use of an exponential window can be found at the following link.

http://thesagesite.com/papers/dave_qa/q&afeb9.pdf