# Noise (disambiguation)

Noise is a variety of sound, usually meaning any unwanted sound.

Noise may also refer to:

## Random or unwanted signals

### 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 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
• Noise-based logic, where logic values are different stochastic processes
• Noise print, a statistical signature of ambient noise, used in its suppression

## In arts and entertainment

### In music

• Noise in music, the occurrence of noise(s) in music, including noise reduction and uses in instrument tone, in composition and in performance
• String noise, made by guitar players sliding the fingers over the strings

#### Musical styles

• Noise music, a noise-based aesthetic in experimental music and sound art
• Noise pop, an alternative rock genre developed in the UK in the mid-1980s
• Noise rock, a style of rock music prominent in the 1980s