Use of the Bessel Filter Option

Use of the Bessel Filter Option

The Bessel filter is a low pass filter with two input variables; order and cut-off frequency.

The order of the filter controls the roll-off rate, as shown here in the figure (right)   This is a 300Hz filter. It can be seen that higher orders attenuate the results more quickly: they have a higher roll-off rate.

This filter works in similar way to how the Butterworth filter works. The implementaion is the same with reflection and passing the curve through the filter forwards and backwards to minimise end-effects and phase change effects.