Analysis/resynthesis of audio

Generative stochastic models for audio. Analyse audio using machine listening methods to decompose it into features, maybe over a sparse basis, as in learning gamelan, and possibly of low dimension due to some sparsification, source separation, maybe including with some stochastic dependence, e.g. a random field or regression model of some kind. Then simulate features from that stochastic model. Depending what your cost function was and how good your model fit was and how you smoothed your data, this might produce something acoustically indistinguishable from the source, or have performed concatenative synthesis from a sparse basis dictionary, or have produced a parametric synthesizer software package.

There is a lot of funny business with machine learning for polyphonic audio. For a start, a naive linear-algebra-style decomposition doesn’t perform great because human acoustic perception is messy. e.g. all white noise sounds the same to us, but deterministic models need a large basis to minutely approximate it in the \(L_2\) norm. Our phase sensitivity is frequency dependent. Adjacent frequencies mask each other. Many other things I don’t know about. One could use cost functions based on psychoacoustic cochlear models, but those are tricky to synthesize from, (although possible if perhaps unsatisfying with a neural network). There are also classic alternate psychoacoustic decompositions such as the Mel Frequency Cepstral Transform, but these are even harder to invert.

Mosaicing synthesis

A.k.a concatenative synthesis. I’m publishing in this area.

More soon.

Neural approaches

See NNs for music.


What is Loris?


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