Noise (spectral phenomenon)

In transportation • Aircraft noise • Jet noise, caused by high-velocity jets and turbulent eddies • Noise and vibration on maritime vessels • Noise, vibration, and harshness, quality criteria for vehicles • Traffic noise, including roadway noise and train noise Other acoustic noise • Artificial noise, in spectator sports • Background noise, in acoustics, any sound other than the monitored one • Comfort noise, used in telecommunications to fill silent gaps • Grey noise, random noise with a psychoacoustic adjusted spectrum • Industrial noise, relevant to hearing damage and industrial hygiene • Noise pollution, that affects negatively the quality of life ==Noise in biology==

• Cellular noise, in biology, random variability between cells • Developmental noise, variations among living beings with the same genome • Neuronal noise, in neuroscience • Synaptic noise, in neuroscience • Transcriptional noise, in biochemistry, errors in genetic transcription ==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 • Perlin noise, a type of gradient noise developed in 1983 • 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 (signal processing), various types of interference • Noise (electronics), related to electronic circuitry • Ground noise, appearing at the ground terminal of audio equipment • Image noise, related to digital photography • Noise (radio), interference related to radio signals • Atmospheric noise, radio noise caused by lightning • Cosmic noise, radio noise from outside the Earth's atmosphere • Noise (video), "snow" on video or television pictures ==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==

• Electrochemical noise, electrical fluctuations in electrolysis, corrosion, etc. • Phonon noise, in materials science • Seismic noise, random tremors of the ground == Measures of noise intensity ==

• Noise figure, the ratio of the output noise power to attributable thermal noise • Ambient noise level, the background sound pressure level at a given location • Noise power, with several related meanings • Noise spectral density, No measured in Watt/Hertz • Noise temperature, temperature that would produce equivalent semiconductor noise ==See also==