I am new to matlab filter design and I found the help file of matlab is a little not comple. For example, in the help file of Butterworth filter design. it said,
[A,B,C,D] = butter(___) designs a lowpass, highpass, bandpass, or bandstop digital Butterworth filter and returns the matrices that specify its state-space representation.
However I still do not know how to apply the matrices to signal I want to filter after I get the matrices.
Another example is the filter designer (fdatool.) In the file->Export there is option to export as "Object" or "System Object" but I do not know what is the difference between the two options.
I am wondering if there is a general matlab guide for filter design?
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