Extract Single Tone Information, Phase algorithm/formula

[Zipmeister]

I am using the Extract Single Tone subVI in order to make phase calculations for a research project. The phase measurements seem to be quite accurate. For my report I need to be able to state how the phase measurements are calculated. Is there a relatively compact way to state the formula that LabVIEW uses to make these measurements?

[johnsold · Accepted solution]

Reading the detailed help file will give you a formula.  If you want more details, open the block diagram and observe that it performs an FFT on the input data and then uses a peak finding algorithm to interpolate the exact frequency from the three dominant bins.

Lynn