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Bessel filter design

Started by HerbertLu 4 years ago1 replylatest reply 4 years ago224 views

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:

1_25595.jpg

But I using these factor to calculate the pole of the Bessel filter, the pole are not same as MATLAB besselap.m, as follows:

Edit2_38215.jpg

This problem has troubled me for a long time.


Herbert

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Reply by jtp_1960June 17, 2020
But I using these factor to calculate the pole of the Bessel filter

Maybe some lines of code of your calculations could be helpful ...?