Butterworth filter
Noun
Meaning
Butterworth filter (plural Butterworth filters)
(signal processing) A kind of filter designed to have as flat a frequency response as possible in the passband.
Synonyms
Examples
The Butterworth filter has the poorest transition but has a more even response, avoiding ripples in either the passband or stopband.
On any Butterworth filter, if one extends the horizontal line to the right and the diagonal line to the upper-left (the asymptotes of the function), they intersect at exactly the cutoff frequency.