How to increase FFT resolution?
Posted: Tue Feb 26, 2013 10:42 am
I'm new Audacity user. The current limit of FFT window size is 2^14 samples. Is it possible to extend it up to 2^16 samples? How?
Regards,
f.
Regards,
f.
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As I wrote, the fft window size is limited up to 2^14 samples. I need larger window - 2^14 samples.kozikowski wrote:Audacity > Preferences > Spectrograms > FFT Window.
That's the only setting I know of.
It's only one "FFT window size" - the number of samples used to calculate the spectrum. The FFT window size determines the frequency resolution of analysis (at specific sample rate).steve wrote:Which FFT window size are you asking about?
Plot Spectrum? Wave track spectrogram view? The Equalization effect? Somewhere else?
The window size of 2^16 must be slower then 2^15. It can't be too slow for these who need it. The user who need faster analysis can select shorter window. The number of 2^16 samples is a rational limit of window size. Adobe Audition has this feature.steve wrote:In the current Audacity 2.0.3 the FFT size in "Edit > Preference > Spectrograms" goes up to a maximum of 2^15 (32768). The developers decided that going higher than this is just too slow.
Unfortunately rpm file isn't available yet.steve wrote:Audacity 2.0.3 is available here: http://audacityteam.org/download/
Well if you're on Linux, why not build Audacity 2.0.3 from the source code (or even get the latest svn version, which is very stable at the time of writing), then you could enable FFT size up to 2^16 if that's what you want. The change is just to add:fonon wrote:Unfortunately rpm file isn't available yet.
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mSizeChoices.Add(_("65536 - OTT"));The "Size" parameter in "Analyze/Plot Spectrum" is still restricted to 2^14 samples (Windows version). Could you explain what it means and why the ranges of "window size" in "Preference/Spectrograms" and "size" in "Analyze/Plot Spectrum" are different?steve wrote:In the current Audacity 2.0.3 the FFT size in "Edit > Preference > Spectrograms" goes up to a maximum of 2^15 (32768). The developers decided that going higher than this is just too slow.
Audacity 2.0.3 is available here: http://audacityteam.org/download/