Butterworth<\/p>\n
Used in applications where maximum pass band flatness is required.<\/p>\n
Designed to have as flat a frequency response as possible in the passband. It is also referred to as a maximally flat (no ripples)\u00a0magnitude filter.<\/p>\n
One main disadvantage is that it achieves this pass band flatness at the expense of a wide transition band as the filter changes from the pass band to the stop band. It also has poor phase characteristics as well.<\/p>\n
Bessel<\/p>\n
Type of analog linear filter with a maximally flat group\/phase delay (maximally linear phase response), which preserves the wave shape of filtered signals in the passband. Bessel filters are often used in audio crossover systems.<\/p>\n
Chebyshev<\/p>\n
Optimized to give a steeper roll off.<\/p>\n
Have\u00a0a steeper roll-off and more passband ripple (type I) or stopband ripple (type II) than Butterworth filters.<\/p>\n
Median<\/p>\n
A type of FIR filter which typically takes an odd number of inputs (e.g. 5 or more usually more) and sorts them by value. The filtered output is the median value (the middle value). A median filter can be very effective at removing noise spikes.<\/p>\n