|What is the difference between pink noise and white noise?|
White noise is a sound that contains every frequency within the range of human hearing (generally from 250 hertz to 8,000 kHz) 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. For example, from 100 Hz to 200 Hz, there are one hundred discrete frequencies. In the next octave (from 200 Hz to 400 Hz), there are two hundred frequencies.
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 We mix white, super white and pink noise to the perfect frequencies to mask human speach, and deliver it in one third octave equalization tuning, as per ASTM, (American Society of Testing and Materials).