Noise Noise Generation-Recombination noise, or g-r noise, is a type of electrical signal noise caused statistically by the fluctuation of the generation and recombination of electrons in semiconductor-based photon detectors. ...more on Wikipedia about "Generation-recombination noise"
Harsh noise is a genre of music that uses no (or minimal) synths, no (or minimal) acoustic instruments, and is created almost entirely by electronic feedback and distortion, along with aimless samples. Primarily from Japan and sometimes referred to simply as Noise, the term Harsh noise came into use to differentiate its style from the vastly different Noisecore genre, which uses instrumentation and song structure. It is closely related to Power Electronic music, but its focus is more on texture and less about composition or feel. ...more on Wikipedia about "Harsh noise"
Helicopter noise reduction is a topic of research into designing helicopters which can be operated more quietly, reducing the public-relations problems with night-flying or expanding an airport. In addition, it is useful for military applications in which stealth is required: long-range propagation of helicopter noise can alert an enemy to an incoming helicopter in time to re-orient defenses. ...more on Wikipedia about "Helicopter noise reduction"
A hum is a sound with a particular timbre (or sound quality), usually a monotone or with slightly varying tones, often produced by machinery in operation or by insects in flight. To hum is to produce such a noise, with humans vocally producing such a sound, humming, though most often with a melody. ...more on Wikipedia about "Hum"
A hush kit is a device for reducing noise from an engine; most commonly the term refers to devices which reduce noise emissions from low-bypass turbofan engines, as fitted to older commercial aircraft (see below for examples). ...more on Wikipedia about "Hush kit"
Image noise is mostly unwanted and manifested in the pixels of an image. It is inherent to digital cameras, and is generated, in part, by heat and low light conditions, and is often prominent in long exposures and photographs taken at high ISO sensitivity. Its effect is analagous to film grain. ...more on Wikipedia about "Image noise"
Traditionally, workplace noise has been a hazard linked to heavy industries such as ship-building and associated only with noise induced hearing loss (NIHL). ...more on Wikipedia about "Industrial noise"
In communications and especially in telecommunications, an interference is anything which alters, modifies, or disrupts a message as it travels along a channel between a source and a receiver. ...more on Wikipedia about "Interference (communication)"
Internet background noise (IBN) consists of data packets on the Internet which are addressed to IP addresses or ports where there is no network device set up to receive them. These noise packets normally contain unsolicited commercial or network control messages, or are the result of port scans and worm activities. ...more on Wikipedia about "Internet background noise"
Johnson-Nyquist noise (sometimes thermal noise, Johnson noise or Nyquist noise) is the noise generated by the equilibrium fluctuations of the electric current inside an electrical conductor, which happens regardless of any applied voltage, due to the random thermal motion of the charge carriers (the electrons). ...more on Wikipedia about "Johnson-Nyquist noise"
This is a list of noise topics, by Wikipedia page. ...more on Wikipedia about "List of noise topics"
Neuronal noise is the term that describes random activity of neurons that presumably is not associated with encoding of behaviorally relevant variables. Many neuroscientists consider neuronal noise a factor that limits the capacity of information processing by the brain. Thus, Patrick Wilken and colleagues have suggested that neuronal noise is the principal factor that limits the capacity of visual short-term memory. Investigators of neural ensembles, and especially those who support the theory of distributed processing, propose that large neuronal populations effectively decrease noise by averaging out the noise in individual neurons. ...more on Wikipedia about "Neuronal noise"
In common use the word noise means unwanted sound, but in electronics noise can refer to the electronic signal corresponding to acoustic noise (in an audio system) or the electronic signal corresponding to the (visual) noise commonly seen as ' snow' on a degraded television or video image. In signal processing or computing it can be considered data without meaning; that is, data that is not being used to transmit a signal, but is simply produced as an unwanted by-product of other activities. In Information Theory, however, noise is still considered to be information. ...more on Wikipedia about "Noise"
When speaking of noise in relation to sound, what is commonly meant is meaningless sound of greater than usual volume. Thus, a loud activity may be referred to as noisy. However, conversations of other people may be called noise for people not involved in any of them, and noise can be any unwanted sound such as the noise of aircraft, neighbours playing loud music, or road noise spoiling the quiet of the countryside. ...more on Wikipedia about "Noise (acoustic)"
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== Audio noise == ...more on Wikipedia about "Noise (audio)"
(Noise (Big-bang)) In recent years, astronomers and astrophysicists realised that if the Universe really did begin with a big-bang then the remnants of radiation which took time to reach us in the expanding universe, should be with us now, Doppler shifted down to microwave frequencies. ...more on Wikipedia about "Noise (Big-bang)"
In any electronic circuit, there exist random variations in current or voltage caused by the random movement of the electrons carrying the current as they are jolted around by thermal energy. The lower the temperature the lower is this thermal noise. This same phenomenon limits the minimum signal level that any radio receiver can usefully respond to, because there will always be a small but significant amount of thermal noise arising in its input circuits. This is why radio telescopes, which search for very low levels of signal from stars, use front-end ciruits, usually mounted on the aerial dish, cooled in liquid nitrogen to a very low temperature. ...more on Wikipedia about "Noise (electronic)"
Environmental Noise, is unwanted sound, which may cause either nuisance or damage to health. 'Nuisance' is however subjective: some sounds are considered noise by some but not by others, e.g. certain music, church bells, calls to prayer from a minaret, sounds of playing children, birds, wind, sea, etc. ...more on Wikipedia about "Noise (environmental)"
== Industrial noise == ...more on Wikipedia about "Noise (industrial)"
Radio noise is interference with radio transmissions caused either by thermal noise from receiver input circuits or by radiated electromagnetic noise picked up by the receiver's antenna. If no noise was picked up with radio signals, even weak transmissions could be received at virtually any distance by making a radio receiver that was sensitive enough. In practice this doesn't work, and a point is reached where the only way to extend the range of a transmission is to increase the transmitter power.
Thermal noise can be made lower by cooling the circuits, but this is only usually worthwhile on radio telescopes. In other applications the limiting noise source depends on the frequency range in use. At low freqencies ( longwave or mediumwave) and at high frequencies ( shortwave), interference caused by lightning or by nearby electrical impulses in electrical switches, motors, vehicle ignition circuits, computers, and other man-man sources tends to swamp transmissions with thermal noise. These noises are often referred to as static. At very high frequency and ultra high frequency these sources can still be important, but at a much lower level, such that thermal noise is usually the limiting factor. In the microwave region, cosmic background noise may be relevant.
Electromagnetic noise can interfere with electronic equipment in general, causing malfunction, and in recent years standards have been laid down for the levels of electromagnetic radiation that electronic equipment is permitted to radiate. These standards are aimed at ensuring what is referred to as electromagnetic compatibility, or EMC. ...more on Wikipedia about "Noise (radio)"
== Video noise == ...more on Wikipedia about "Noise (video)"
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In telecommunication, noise figure (NF) is the ratio of the output noise power of a device to the portion thereof attributable to thermal noise in the input termination at standard noise temperature (usually 290 K). ...more on Wikipedia about "Noise figure"
In signal theory, the noise floor is the measure of the signal created from the sum of all the noise sources and unwanted signals within a measurement system. ...more on Wikipedia about "Noise floor"
A noise gate is an electronic device or software logic that is used to control the volume of an audio signal. They are commonly used in the recording studio and sound reinforcement. Small portable units are also used by rock musicians to control unwanted noise from their amplification systems. Band-limited noise gates are also used to eliminate background noise from audio recordings by eliminating frequency bands that contain only static. ...more on Wikipedia about "Noise gate"
In telecommunication, noise level is the noise power, usually relative to a reference. ...more on Wikipedia about "Noise level" shortopedia Dreamteam. Noise
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