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08 March 2019

Which Windowing Function to Use in FFTs?

Figure 1: Examples of a Hamming
function (blue) and Hanning function
(red)
When performing a fast Fourier transform on an acquired waveform, you'll often encounter situations where the waveform doesn't sit neatly within the oscilloscope's acquisition window so that the voltage is the same at the window's beginning and end. The ensuing discontinuity from window to window results in high-frequency artifacts, and the way to address this issue is a technique known as "windowing."