Colors of noise
Different colors of noise have significantly different properties: for example, as audio signals they will sound different to human ears, and as images they will have a visibly different texture. Therefore, each application typically requires noise of a specific color. This sense of 'color' for noise signals is similar to the concept of timbre in music (which is also called "tone color"
Random noise signals can be used for a wide range of purposes. One of the most common is to help block out other sounds. If you are trying to sleep but are disturbed by tinnitus, playing noise in the background can help to mask it.
White noise
White noise is a signal (or process), named by analogy to white light, with a flat frequency spectrum when plotted as a linear function of frequency (e.g., in Hz).
Pink noise
Brown noise
Brown noise can be generated with temporal integration of White noise. "Brown" noise is not named for a power spectrum that suggests the colour brown.
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Blue noise
Blue noise is also called azure noise. This can be good noise for dithering.
Violet noise
Violet noise is also called purple noise. Acoustic thermal noise of water has a violet spectrum, causing it to dominate hydrophone measurements at high frequencies.
Grey noise
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Black noise
Black noise is also called silent noise
•Silence is all of the sound we don't intend.(John Cage)
•There is no such things as absolute silence.(John Cage)
