Need Help with apply lowpass filter with window method lowpass design

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nam bui 2021-2-10

评论： nam bui 2021-2-23

Hello, I'm trying to filter out the noise of my csv file data using lowpass at cut of freq of 5 hz but it give me this error. Any suggestion?

Thank you in advance

Mathieu NOE 2021-2-23

hello

filter requires 3 input arguments, filter(b,a,x).

you cannot give a tf object as input argument of filter

your filter must be given as a numerator (b) and a denominator (a)

filter One-dimensional digital filter.

Y = filter(B,A,X) filters the data in vector X with the

filter described by vectors A and B to create the filtered

data Y. The filter is a "Direct Form II Transposed"

implementation of the standard difference equation:

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)

If a(1) is not equal to 1, filter normalizes the filter

coefficients by a(1).

nam bui 2021-2-23

hello, thank you for replying and I figured it out already.

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