On Wed, Jan 19, 2011 at 3:19 AM, Rudolf Widmer-Schnidrig
<address@hidden> wrote:
Dear List,
I have measured (in the time domain) input and output of a mechanical system (a seismometer) and would like to derive a filter model B(s)/A(S) based on this data.
I see the path via the frequency domain:
[H, F] = pwelch(input,output,.....'trans')
[B, A] = invfreqs(H,F,nA,nB)
Question: is there a way to find A and B without going first into the Fourier domain?
many cheers - Ruedi
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+---------------------------------------------------------------+
Rudolf Widmer-Schnidrig
What Input did you use?
If it was an impulse then Yes
if it was a step then yes
and maybe more.
Doug