Hi,
On Tue, 2008-02-12 at 13:45 -0800, punchik punchik wrote:
ive heard a lot of times that natural sounds has more spectral richness that digital generated sounds... is it possible to measure the spectral richness of a sound?
There isn't a standard metric for 'richness' as far as I know. However, you might be able to break down the 'richness' percept into a number of features that can be measured.
Things that spring to mind as contributing to perceived richness are:
- The number of measured partials
- The 'inharmonicity' of the spectrum (i.e. its divergence from a purely
harmonic signal)
- The 'spectral flux' the amount of variation (transience) in the
spectrum between frames
You could try to find a mathematical relationship between these factors that corresponds to the richness percept, or you could use some kind of classifier which you would 'train' to relate a given richness input vector (npartials, inharmonicity, flux) with a perceptually determined output measure of richness. One of the simplest classifiers for this is the k-NN classifier.
Jamie