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

[squinkylabs]

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]

I have the same question

[jmidt]

@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]

no as far as I know.