Spectrum and frame size

[Andrea C]

I’m not really sure how the frame size of the Fourier transform relates to the lenght of the audio sample selected for the spectrum creation. Does the transform analyze the audio sample by dividing it into chunks of the lenght of the frame and then summing the spectra obtained?

[Simon]

In general, we analyse each frame individually.

You’re probably referring to Wavesurfer’s feature to take the average spectrum across the selected region. In this case, the region is divided into frames (the size of which is controlled by the FFT points setting). Each frame is analysed (i.e., pass through the FFT) and then averaged to obtain the spectrum that is displayed.

[Author]

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