Should the filter frequency response contain magnitude greater than 3dB in magnitude?

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632541
632541 2021-9-22
评论： Chunru 2021-9-22
Should the filter frequency response contain magnitude greater than 3dB in magnitude at why axis?
Below is the frequency response of filter. As one can see that the magnitude is in power of 10^-6. IS this design correct?
Is it possible to have low magnitude?
Can one conclude the roll off?
Please clarify my doubts

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Chunru
Chunru 2021-9-22
if you have 10^-6 dB or lower, then the response is almost flat in amplitude. The design or something else is most likely wrong if you are not design a all-pass filter. To further check the problem, you may want to post the code to produce the plot.
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632541
632541 2021-9-22
编辑：632541 2021-9-22
Thank you so much..
%Passband Ripple: 1dB
% Stopband Atten: 50dB
You have assumed these two?
Order can be reduced futher to get less number of coefficients ?
Can this be done for butterworth?
Chunru
Chunru 2021-9-22
Those parameters can be adjusted. Try it out yourself. Order can be reduced (or estimated). You can try some small values and oberve the transition band around fc. "doc ellip" for more details.
Sure you can use other types of filter. But for a very small value of fc/(fs/2), ellip may result in sharper transition band.

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