Hi all.
I'm trying to play a sound as a sine wave down a pipe and detect the wave at the opposite end using a microphone, and then see how the two waves match up. I can get the frequency and amplitude using the 'tone measurement' vi's. The issue arises when trying to find a 'goodness of fit' between the generated and detected sine waves. I took inspiration from here:
http://forums.ni.com/t5/LabVIEW/Lev-Mar-non-linear-fit-problem/td-p/1187883
to generate the attached vi. The subvi simply generates a sin wave and its XY pairs are extracted. They then feed into the curve fit to theoretically give a perfect fit- but I get a 'wrong model' error. I've changed the model to incorperate a 2pi term too but to no avail. If anyone can suggest reasons why/ solutions it would be appreciated.
Thanks.