FFT from a binary input file

[needtolearnfast]

Hi,

What I have done is to read in an analog input wave and save it in binary form to disk. Now I want to open that file and run an FFT on the whole thing and show all the peaks that occur on one graph. Is this possible using labview and if so any suggestions on how to go about doing it? Thanks a lot for your help.

[minnellac]

Yes it is possible. You need to read your binary file, scale it, and then run an FFT on it. There are examples showing how to scale binary data (hopefully you just used one of hte stream to disk examples that has a read and display example paired with it). Then, if the data is reasonably sized, pass it to an FFT, and plot. If your data set is large, you may need to break up the data into chunks and then average the spectra.

Chris