Re: [Audacity-devel] Chebyshev filter

[Norm C <n_b...@ho...>]

Stevethefiddle wrote
> ...zero, the filter becomes a type II Chebyshev filter"
> 
> That makes sense when thinking of "ripple" as the amount of 'wiggle'
> in the passband/stopband, but that is not how the term "stopband
> ripple" is used in the new "Scientific Filter" effect.

It is, although to be completely accurate it should be specified as the
negative of what it is currently specified as. Eg. for a stopband ripple of
"20 dB", the stopband response varies between 0 (-inf dB) and 0.1 (-20 dB).

If you think it's clearer to specify it as a negative quantity, I can change
it accordingly - probably the best thing would be to put a negative sign in
the non-editable portion just to the left of the edit box though, since it
can never go positive.

Norm




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