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Christian Guenther

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12-31-2001 07:06 AM

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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

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01-02-2002 09:16 AM

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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