help with FiltFilt and entering coeff

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David Ballantine 2018-4-2

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评论： Osman Atay Öztürk 2021-9-10

Is there a video on how to enter filter coeff, I have these calculated but not sure how I enter them. I have calculated my Xabs but don't know how to to filter the signal using:

a(1)*y(n) = b(1)*x(n) + b(2)*x(n-1) + ... + b(nb+1)*x(n-nb) - a(2)*y(n-1) - ... - a(na+1)*y(n-na) a(1)*y(n) = b(1)*x(n) + b(2)*x(n-1) + ... + b(nb+1)*x(n-nb)

I don't want to use toolbox.

Thanks

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回答（1 个）

Abhishek Ballaney 2018-4-6

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https://ww2.mathworks.cn/matlabcentral/answers/392169-help-with-filtfilt-and-entering-coeff#answer_313735

https://in.mathworks.com/help/signal/ref/filtfilt.html

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David Ballantine 2018-4-7

That’s not what I was looking for.

I have calculated the coeff of both a and b, I have 2 terms in A and 3 terms in B but I don’t know how to use these when using the filter(b,a, X).

Thanks

Osman Atay Öztürk 2021-9-10

change the order of filter probably you used first order butterworth filter thats why you have 2 terms in A and B.

[b,a] = butter(N,Wn,'high');

Change N for changing order of butter filter.

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