[LAU] DFasma 1.4.4 - A tool to analyse and compare audio files in time and frequency

[Gilles Degottex]

"I want a program
that exposes what's different about mix A from mix B, not just in
frequency spread, but also over time, and with regard to stereo field."

Well I'll not dare diving into the perceptual dimension of this problem.
The only thing I can say is that there are definitely visual
representations that will help you to better understand what's going on in
a sound or between two similar sounds. It's never gonna be 100% correlated
to perception. Though, while it is more correlated than the waveform's
shape, this will help ... The STFT is going towards this direction and I
think there are many other tools that will help (wavelets, reassignment,
phase variance, FM-demodulated STFT, etc.)

Concerning DFasma, I started to code the FM-demodulated STFT, I plan to add
also the reassignment. Additionnally, I'll add some spectral envelope
estimation methods (first in the amplitude spectrum view, then in a
spectrogram-like view).

Cheers,
Gilles

On Fri, Mar 11, 2016 at 4:52 PM, Brent Busby <brent at keycorner.org> wrote:

> Ralf Mardorf <ralf.mardorf at alice-dsl.net> writes:
>
> > take a look at painted colors in the way Josef Albers did by his
> > "Interaction of Color".
> >
> > Take a look at the same blue square on a green and orange background.
> >
> > Assumed software should give each colour an unique sinus frequency, you
> > could hear three different sinus tones. One for the green, one for
> > the orange and one for the blue, but for the brain the blue that is
> > equal on the green and on the red background, seems to be two different
> > shades of blue. This might also be the case of the impression of two
> > mixed sinus tones, but your understanding of the painted colors wont
> > become more objective by listening to the sound.
> >
> > There is nothing crucial for the overall effect you could analyse
> > by objective, measurable values. That's why there is not one valid
> > color theory, there are several color theories and even if only one
> > valid color theory would exist, it can't give an ultimate answer to
> > overall effects of complex paintings, in combination with different
> > compositions of similar paintings, let alone for comparison of
> > completely different paintings from different cultures.
> >
> > If a sound analysis done by software of Arnold Böcklin's different
> > versions of his "Isle of the Dead" would provide you different tone
> > combinations, it would be harder to determine the impression of the
> > painting by the sound, then by taking a look at the paintings.
> [...]
>
> That makes sense.  I'm still not quite ready to raise the white flag of
> defeat though.  Over many years, developers of image processing programs
> have made those programs aware of gamut.  It's gotten fairly complicated
> in some ways, but programs like Photoshop now pride themselves in it.
>
> Even if it ends up being way more than just a simple fourier transform
> analysis, I'm still convinced that you could make some kind of tool that
> would be able to tell you something visually about what's happening in a
> mix.  Sonic Visualiser is in the right direction, but I'm still
> convinced that you could do more.
>
> --
> - Brent Busby   + ===============================================
>                 +       "With the rise of social networking
> -- Keycorner -- +       sites, computers are making people
> -- Recording -- +       easier to use every day."
> ----------------+ ===============================================
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