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bandpass fillter design in simulink

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Yang Xu
Yang Xu 2020-11-10
编辑： Yang Xu 2020-11-10
A signal, which is a output of a simulink submodel with harmonic frequency at 20-30Hz, has great influence on system control performance.
You can consider this signal as a analog signal, is there any method can be applied to extract these harmonics without phase shift?
I thought that bandpass filter might be a good choice, but i have no idea in digital filter and how to use the @simlink submodel "bandpass filter", as shown in the following figure.
So i am wonder is there any other substitute options to bulid a bandpass filter with narrow bandwidth and fast roll-off, for example, use transfer function?Can anyone give me some advice?

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