You accidentally posted under the SignalExpress forum, not the LabVIEW forum, so you might want to repost there is you do not get a good response here.
To answer your original question, the Full and Pro versions of LabVIEW have built-in functions for FFT, logarithm, and inverse FFT, so doing it your self should be fairly easy. If you have the Base version of LabVIEW, you will need to write the FFT and inverse FFT yourself. LabVIEW is a fairly complete general purpose programming language with an enormous number of built in functions, so none of this should be difficult. Many years ago, long before I joined National Instruments, I used to prototype algorithms using Mathematica, then translate them to LabVIEW for "real-time" use. I never had any trouble doing it.
Good luck. Let us know if you need more help.
