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Old 11-27-2018, 01:42 PM   #1
juliansader
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Join Date: Jul 2009
Posts: 3,714
Default Improved spectrogram frequency resolution: custom FFT sizes

Here is a comparison between REAPER and RX7's spectrograms for the same piece of music:

REAPER:


RX7:


The RX7 spectrogram is obviously much sharper in the frequency domain, and much more informative.

RX7 offers advanced options such as "Adaptively sparse" analysis, and I don't know how difficult it would be to program these for REAPER.

However, even when using only the most basic settings, a spectrogram can be vastly improved by simply tweaking the FFT size. My guess is that REAPER uses an FFT size of 256 samples, since RX7 and Audacity's spectrograms look very similar to REAPER's, if they use that FFT size (and only basic analysis).

Here is Audacity's version, with an FFT size of 4096. Although not as good as RX7, it is a big improvement over REAPER:

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