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10-th order Bessel filter

Based on a Labs project | October 2011 | Find it here
10-th order Bessel filter
A Bessel filter has a fairly constant transit time (delay) over the pass band, but its amplitude characteristic starts to fall off rather earlier than in a Butterworth filter. Moreover, the skirts of the amplitude characteristic are not as steep as those of a Butterworth filter. For instance, the -0.1 dB point in a Bessel filter occurs at 184 Hz, and the -1 dB point at 581 Hz; the same points in a Butterworth filter occur at 827 Hz and 934 Hz respectively.
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