This perception occurs because each successive octave has twice as many frequencies as the one preceding it. For example, from 100 Hz to 200 Hz, there are one hundred discrete frequencies. White noise can be generated on a sound synthesizer. 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 decibel , resulting in a noise sound wave that has equal energy at every octave.