Fisheye Effect for Audio Signals via STFT Transformation

Start with an audio signal:

In[1]:=

a=

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Data in Notebook

;

Show its spectrogram:

In[2]:=

Spectrograma,

...

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Out[2]=

Define a transformation that creates a fisheye effect:

In[3]:=

fisheye[pt_]:=With{s={.55,.55}},Module{r,a},r=

2

Norm[pt-s]

Norm[s];a=ArcTan@@(pt-s);s+r{Cos[a],Sin[a]}

Apply the fisheye effect in the frequency domain using

which computes a backward transformation between the input and output signals' STFTs:

In[4]:=

a2=AudioSpectralTransformationfisheye,a,

data range

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Out[4]=

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00:20

Data in Notebook

In[5]:=

Spectrograma2,

...

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Out[5]=

Related Symbols