필터 지우기
필터 지우기

Bessel Filter -3dB frequency

조회 수: 22 (최근 30일)
Craig
Craig 2019년 4월 2일
답변: filippo tosi 2022년 1월 25일
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

채택된 답변

filippo tosi
filippo tosi 2022년 1월 25일
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

추가 답변 (0개)

카테고리

Help CenterFile Exchange에서 Analog Filters에 대해 자세히 알아보기

제품


릴리스

R2019a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by