From Wikipedia, the free encyclopedia
Types of noise
Noise refers to many types of random, troublesome, problematic, or unwanted
signals .
Acoustic
noise may mar aesthetic experience, such as attending a concert hall. It may also be a medical issue inherent in the biology of hearing.
In technology, noise is unwanted signals in a device or apparatus, commonly of an electrical nature. The nature of noise is much studied in
mathematics and is a prominent topic in
statistics .
This article provides a survey of specific topics linked to their primary articles.
Acoustic noise
In transportation
Other acoustic noise
Noise in biology
Noise in computer graphics
Noise in computer graphics refers to various pseudo-random functions used to create textures, including:
Gradient noise , created by interpolation of a lattice of pseudorandom gradients
Simplex noise , a method for constructing an n -dimensional noise function comparable to Perlin noise
Simulation noise , a function that creates a divergence-free field
Value noise , created by interpolation of a lattice of pseudorandom values; differs from gradient noise
Wavelet noise , an alternative to Perlin noise which reduces problems of aliasing and detail loss
Worley noise , a noise function introduced by Steven Worley in 1996
Noise in electronics and radio
Noise in mathematics
Any one of many statistical types or
colors of noise , such as
White noise , which has constant power spectral density
Gaussian noise , with a probability density function equal to that of the normal distribution
Pink noise , with spectral density inversely proportional to frequency
Brownian noise or "brown" noise, with spectral density inversely proportional to the square of frequency
Pseudorandom noise , in cryptography, artificial signal that can pass for random
Statistical noise , a colloquialism for recognized amounts of unexplained variation in a sample
Shot noise , noise which can be modeled by a Poisson process
Noise-based logic , where logic values are different stochastic processes
Noise print , a statistical signature of ambient noise, used in its suppression
Other types of noise
Measures of noise intensity
See also