POV-Ray : Newsgroups : povray.off-topic : More accurate spectrogram : Re: More accurate spectrogram Server Time
26 Sep 2024 17:44:49 EDT (-0400)
  Re: More accurate spectrogram  
From: Invisible
Date: 23 May 2011 06:53:52
Message: <4dda3cc0$1@news.povray.org>
On 20/05/2011 16:30, Mike Raiford wrote:

> Turns out, by looking at the /phase/ of the signal in addition to the
> frequency and differentiating that with a previous sample and FFT
> bucket, you can find out where in that block the sound should lie. It
> only works well, of course when there's a single sound at a time in the
> bucket, more frequencies stacked on top of each other in a single bucket
> during a single sample interval means it can't actually do the
> approximation, and will result in scattering. But, in situations where
> the harmonics don't share a space, you can get a much more accurate
> picture of what the frequencies are. (rather than everything being a
> power of 2)

Wikipedia has this to say:

http://en.wikipedia.org/wiki/Reassignment_method

No, I still don't understand it.


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