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What does gray noise mean?
Gray noise is a specific kind of spectral sound that is intended for the psychoacoustics of the human ear. It differs in frequency allocation from other types of noise, which work differently for different frequencies. Some new technologies can use gray noise to achieve a certain type of distributed sound effectively, in other words, at lower decibel levels.
Techopedia explains gray noise
Experts describe gray noise as noise that has more power at the top of the frequency spectrum and at the bottom of the spectrum, with less density in the middle of the spectrum. Scientists point out that this complements the acoustics of the human ear, making each frequency sound equally loud to the listener. Others have described gray noise as sounding like a three-dimensional kind of sound, or a sound that is not flat but has some depth. Some contrast noise with another kind of noise, such as white noise, which is commonly used as a sleep aid, has some contrast.
Gray noise has also been useful in testing a person's hearing.