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what are the units of "rolloff" for the Elliptic filters? #47

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squinkylabs opened this issue Jul 30, 2018 · 3 comments
Open

what are the units of "rolloff" for the Elliptic filters? #47

squinkylabs opened this issue Jul 30, 2018 · 3 comments

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@squinkylabs
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In the Elliptic filter designers, rippleDB is in DB, of course. Order and frequency are pretty clear. But what is rolloff? Is it decibels per octave? decibels?
@Stefeg
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Stefeg commented Nov 21, 2018

I have the same question

@jmidt
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jmidt commented Dec 17, 2020

@squinkylabs @Stefeg
Did anyone figure this out? I have been looking over the math, but I can't see how this is related to the more standard filter parameters, such as the stopband attenuation.

@squinkylabs
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no as far as I know.

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@Stefeg @squinkylabs @jmidt