White noise is a sound that contains every frequency within the range of human hearing in equal amounts. Most people perceive this sound as having more high- frequency content than low, but this is not the case. This perception occurs because each successive octave has twice as many frequencies as the one preceding it. White noise can be generated on a sound synthesiser. Sound designers can use this sound, with some processing and filtering to create a multitude of effects such as wind, surf, space, whooshes, and rumbles. Pink noise is a variant of white noise. Pink noise is white noise that has been filtered to reduce the volume at each octave. This is done to compensate for the increase in the number of frequencies per octave. each octave is reduced by 6 decibels resulting in a noise sound wave that has equal energy at every octave.
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