Hi,
Did you try a mathematical correlation?
Klaus
Hi,
Usually you should know your input signal, therefore running the FFT is redundant.
Determine the frequency of interest: in my eyes is not necessary for running a correlation.
Just run the correlation between input and output signal.
The result of the correlation should give the coefficients of the FIR filter (just with inverted sign)
Can you show us the results of the correlation?
In your diagram the horizontal line is "samples". Please show it in "time" or give the sample rate.
Mind the echo of an open pipe is "negative", and of a closed pipe is "positive".
Expect the first echo of a 3m pipe after about 20ms..
Klaus
The result of the correlation should give the coefficients of the FIR filter (just with inverted sign)
Hi,
You should not not correlate with only 4 sampmes, but with the whole sequence ( of interest) with the output signal.
As far as ican see this are about 100 samples of input signal.
And you have to correlate it with the output signal. For tis is maybe 500 samples in length you need to correlate sample 0 to 99 of output signal with the input signal, then 1...100, then 2 to 101 up to 400 to 499 .
This gives 400 outputs for the correlation.
Then show these 400 values in a diagram...
Klaus
I will do this and Post, thankyou.
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