Bessel Filter -3dB frequency
显示 更早的评论
The documentation for besself states: "[b,a] = besself(n,Wo) returns the transfer function coefficients of an nth-order lowpass analog Bessel filter, where Wo is the angular frequency up to which the filter's group delay is approximately constant."
Is there a way to determine what frequency one should input in order to obtain a -3dB amplitude response at a specific frequency?
I realize the bessel filter is used primarily for its phase response and group delay, but I would like to plot the response of several poles of filters all normalized to -3dB at 1 rad/sec for comparison purposes as is often done with the butterworth filter.
Thanks for any help you can provide
采纳的回答
filippo tosi
2022-1-25
0 个投票
Dear Craig,
you can achieve this result by applying some scaling coefficients when designing your filter, as shown here:
For example, in the case of a 3rd order filter with fcut=1000Hz -3dB:
[b,a]=besself(3,1000*2*pi*sqrt(1.755672389));
I hope this helps,
Fil
更多回答（0 个）
类别
在 帮助中心 和 File Exchange 中查找有关 Analog Filters 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
