On Wed, Jan 19, 2011 at 9:38 AM, Rudolf Widmer-Schnidrig
<address@hidden> wrote:
On 19.01.11 13:32, Doug Stewart wrote:
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
--
+---------------------------------------------------------------+
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
Dear Doug, I have used both a sweep and a random telegraph
signal. -Ruedi
OK
A sweep is inherently a frequency domain type of test so maybe you can use Bode type analysis to find the corner freq. and gain and type of role off etc.
is the random telegraph signal a white noise type of signal??
Doug