The Working Principle Of A White Noise Machine

The range of sound frequencies audible to humans primarily spans from 20 Hz to 20 kHz; within this range, white noise possesses essentially equal power across every frequency.

 

Noise, too, comes in different "colors." Scientists have refined white noise to develop a series of "colored noises," which currently comprise six main varieties-including gray noise, pink noise, and violet noise. Mirroring the naming convention for white noise, the spectral distribution of these other colored noises bears a resemblance to the spectral distribution of their corresponding colors in the visible light spectrum.

 

White noise serves as a means of masking unwanted noise and external sounds; the continuous acoustic environment it creates may help minimize distractions. Based on its specific acoustic properties, white noise may also aid in maintaining a state of sleep. In work or study settings, the balanced acoustic environment fostered by white noise-operating on the principle of repetitive, monotonous stimulation-may influence one's ability to concentrate. The underlying mechanism by which white noise provides continuous auditory input shares similarities with methods such as "counting sheep."