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How to design a filter to pass frequencies between 0 and 12Hz

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HF
HF on 29 Oct 2020
Answered: Star Strider on 30 Oct 2020
Hello, I trying to design a filter in order to allow only certain frequency to pass the filter. I have a set of data and I am only interested in frequencies between 0 and 12Hz.
My approach was following:
filtCoeff = designfilt('bandstopiir', 'FilterOrder', 20,...
'HalfPowerFrequency1',11, 'HalfPowerFrequency2',498,...
'SampleRate', Fs);
acc_x = filter(filtCoeff,acc_x_unfiltered);
acc_y = filter(filtCoeff,acc_y_unfiltered);
Is this correct? Can someone help me?
Thank you in advance!

Accepted Answer

Star Strider
Star Strider on 30 Oct 2020
If you only want to pass 0 Hz to 12 Hz, and you have R2018a or later, use the lowpass function. If you want to reject those frequencies, use the related highpass function (linked to at the end of the lowpass documentation page).

More Answers (1)

Sriram Tadavarty
Sriram Tadavarty on 30 Oct 2020
Hi Hishan,
You can confirm if your filter designed meets the requirements, by looking at the frequency response of the filter using FVTool or freqz or any equivalent.
For easy way of designing a filter with required specifications, i suggest to use Filter Designer. This is a GUI interface showing the frequency response there itself.
For more insighits of designing a practical filter, you can look over this.
Hope this helps.
Regards,
Sriram

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