Look up noise in Wiktionary, the free dictionary.

Noise is unwanted sound or signal.

Noise may also refer different types of interference such as:

• Noise (audio), residual low level "hiss or hum"
• Noise (video), "snow" on video or television pictures
• Image noise, related to digital photography
• Noise (electronics), related to electronic circuitry
• Noise (radio), interference related to radio signals
• Noise (telecommunications), interference in telecommunications signal

Noise may also mean:

• Industrial noise, hearing damage and industrial hygiene
• Noise figure, the ratio of the output noise power to attributable thermal noise
• Noise spectral density, N_o measured in Watt/Hertz
• Noise (economic), relates to a theory of pricing developed by Fischer Black
• Perlin noise, artificial pseudo-random noise used for computer graphics effects
• Statistical noise, a colloquialism for recognized amounts of unexplained variation in a sample

In arts and culture:

• NOiSE, a manga by Tsutomu Nihei
• Noise (Goidelic mythology) or Naoise, a figure in Irish mythology
• Noise (music), a noise-based aesthetic in experimental music and sound art
• Noise (Archive album)
• Noise (DecembeRadio album)
• Noise (2007 Australian film), a drama written and directed by Matthew Saville
• Noise (2007 U.S. film), a comedy-drama written and directed by Henry Bean
• Noise (programming block), a Fuji TV late-night anime programming block
• Noise (company), a second-party video game developer for Nintendo
• Noise (book), a 2006 popular science book by Bart Kosko

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