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Additivity, in biochemistry, the simple sum of effects due to multiple causes
Food additive, a substance added to food to improve flavor or appearance
Fuel additive, a substance used to improve the performance of a fuel, lower emissions or clean the engine
Weakly additive, the quality of preferences in some logistics problems
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Additive Color Synthesis is the method of creating color by mixing various proportions of two or three distinct stimulus colors of light.
The distinguishing features of additive color synthesis are that it deals with the color effects of light rather than with pigments, dyes, or filters, and that the stimuli come from separate monochromatic sources.
The most common example of additive color synthesis is the color television screen, (or RGB monitor), which is a mosaic of red, green, and blue phosphor dots; at normal viewing distances the eye does not distinguish the dots, but blends or adds their stimulus effects to obtain a composite color effect.
Additive synthesis emulates such timbres by combining numerous waveforms pitched to different harmonics, with a different amplitude envelope on each, along with inharmonic artefacts.
Additive synthesis can also create non-harmonic sounds if the individual partials are not all having a frequency that is an integer multiple of the same fundamental frequency.
It has been shown in Wavetable Synthesis 101, A Fundamental Perspective, that wavetable synthesis is equivalent to additive synthesis in the case that all partials or overtones are harmonic (that is all overtones are at frequencies that are an integer multiple of a fundamental frequency of the tone as shown in the equation above).
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