Encyclopedia > White noise

  Article Content

White noise

White noise is a signal or process with a flat frequency spectrum. In other words, there is equal energy in a given bandwidth at any centre frequency. In time domain, the magnitude of a white noise process has normal distribution.

In digital signal processing, almost all types of noise are often approximated with with white noise since it has several useful statistical properties. For example, it is statistically uncorrelated in time with any other signal, including itself.

In practical applications few signals are exactly white noise, or even close to white noise. However, signals such as gunshot noise and thermal noise have a close to flat spectrum.

A closely related concept is pink noise which a sound that is perceptually white noise. That is, the human auditory system perceives equal magnitude on all frequencies.

See also: Statistics



All Wikipedia text is available under the terms of the GNU Free Documentation License

 
  Search Encyclopedia

Search over one million articles, find something about almost anything!
 
 
  
  Featured Article
Battle Creek, Michigan

... Geography According to the United States Census Bureau, the city has a total area of 113.1 km² (43.7 mi²). 110.9 km² (42.8 mi²) of it is land and 2.2 ...

 
 
 
This page was created in 23 ms