I have a question about design Bessel filter.
To find the pole of Bessel filter, the frequency normalization process required the division of Thomson’s values by a factor(Bessel Normalizing Factors), as follows:
But I using these factor to calculate the pole of the Bessel filter, the pole are not same as MATLAB besselap.m, as follows:
This problem has troubled me for a long time.
But I using these factor to calculate the pole of the Bessel filter
Maybe some lines of code of your calculations could be helpful ...?