Editing Timbre (section)

==Tristimulus timbre model==<!--merged from [[Tristimulus timbre model]] per b[[WP:Articles for deletion/Tristimulus timbre model]]-->
The concept of [[tristimulus]] originates in the world of color, describing the way three primary colors can be mixed together to create a given color. By analogy, the musical tristimulus measures the mixture of [[harmonic]]s in a given sound, grouped into three sections. It is basically a proposal of reducing a huge number of sound partials, which can amount to dozens or hundreds in some cases, down to only three values. The first tristimulus measures the relative weight of the first harmonic; the second tristimulus measures the relative weight of the second, third, and fourth harmonics taken together; and the third tristimulus measures the relative weight of all the remaining harmonics:{{r|Peeters2003|PollardJansson1982}}{{Page needed|date=December 2013}}
: <math>
 T_1 = \frac{a_1}{\sum_{h=1}^H a_h}, \quad
 T_2 = \frac{a_2 + a_3 + a_4}{\sum_{h=1}^H a_h}, \quad
 T_3 = \frac{\sum_{h=5}^{H}{a_h}}{\sum_{h=1}^H a_h}.
</math>
However, more evidence, studies and applications would be needed regarding this type of representation, in order to validate it.