Butterworth Hospital | Butterworth | Electronic filter | Digital filter | Cherry Filter | Air filter | Photographic filter | Ohne Filter | Kalman filter | George Butterworth's | digital filter | Bob Butterworth | Water filter | water filter | Shiva amplifier chains showing spatial filter tubes (white) and Nd:glass amplifier structures (short blue tubes closest to camera). Portions of the 1982 Disney film ''Tron | Sand filter | Probabilistic data association filter | Oil filter | Neutral density filter | Michael Butterworth | Klaus Filter | Hezekiah Butterworth | Fram (oil filter) | elliptic filter | CSS filter | Cast Iron Filter | Brad Butterworth | Band-pass filter | air filter | Adaptive filter |
For some filter classes, such as the Butterworth filter, the insertion loss is still monotonically increasing with frequency and quickly asymptotically converges to a roll-off of 6n dB/8ve, but in others, such as the Chebyshev or elliptic filter the roll-off near the cut-off frequency is much faster and elsewhere the response is anything but monotonic.