White noise is a combination of all audible frequencies of sound and is used for relaxation and masking other noises. It can be produced by generators or purchased on CDs, and has practical uses in various industries.
White noise is noise created when all audible frequencies of sound are combined at the same time and with the same density. It is similar in nature to white light, which occurs when all the colors of the spectrum are brought together. This noise incorporates over 20,000 frequencies. Also called white sound, it is mainly used as an aid to sleep or relaxation.
The actual sound produced by white noise is comparable to rain or ocean waves. It’s a gentle tone that can be found in nature. Because it combines all sound frequencies ranging from very low pitches to high pitches, it is very useful for masking other noises and sounds.
Fans and broadcast-free radio stations are often used as white noise simulators, providing a soothing sound that blocks out other background noise. While these methods don’t produce true white noise, their effects are a good example of practical uses for sound. The main disadvantage of using this variety, however, is that the user has no control over the volume or frequencies produced this way.
A pure white signal can only be produced by generators, commercially available as “white noise machines”. While expensive and quite large and cumbersome, these machines are useful for those with sleep disorders or inner ear problems, children who have trouble falling asleep or staying asleep, and those looking to de-stress. White noise cancels out background noise and produces a soothing and relaxing sound. Students and those working in the creative arts use it to block out distracting external sounds. It also appears to have some benefit for children and adults diagnosed with attention deficit disorder and its related conditions, as the masking effect allows for better concentration.
Consumers can also purchase white noise that has been recorded onto a CD, which is less expensive than investing in a machine. In addition to affordability, CDs allow the user to alter the bass and treble of noise to mask lower or higher background sounds in any location. Recorded media that feature the sounds of nature work in much the same way. Other uses for this noise include frequency testing for electronic equipment, testing for building acoustics, and use as sensory deprivation aids. Musicians use it in electronic music to simulate higher or lower percussion sounds than are available through traditional instruments.
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