It is available in DustAnalyzer which is free and mentioned in the post just above the one from you I quoted.blackspiral wrote:By spectrogram I mean that : http://en.wikipedia.org/wiki/Spectrogra ... -19thC.png
it seems some are calling it 'sonogram'.
Unfortunately it's not available in any of the free versions of what you are suggesting guys.
Any other?
Other than that check out sonogram sg-1 and IHASpectrogram.