How do I report spectrogram parameters?

When writing a manuscript you may want to mention the spectrogram settings used in your analysis.

To access the current Spectrogram parameters, right-click the spectrogram area.

You can report the following parameters:

nSFT length. This is the length of the analysis window, in samples (e.g. 1024). It equals the Frame size, or Frame length, because the signal is not zero-padded in UltraVox XT 4.

nIn UltraVox XT 3, you could apply zero padding. In that case the frame size was 100% if zero padding was 1, 50% if zero padding was 2, etc.

nWindow type = Hamming (not adjustable).

nOverlap (%). This is the Overlap between two subsequent analysis frames.

nHop length. This is not reported by UltraVox XT but may be required by reviewers. Hop length is related to overlap by the following formula:

Hop length = SFT length * (100-Overlap)/100

For example, if your SFT is 1024 and Overlap is 0%, each new analysis frame starts immediately after the previous one, with no overlap. So the hop length is the same as the SFT length, that is 1024. If the Overlap is 50%, the new analysis frame will be at halfway of the previous one. The hop length is therefore 1024 * 1/2 = 512.

See also

nThe Spectrogram