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Noise - dual sim wifi phone Manufacturer - China cheapest dual sim mobile by qrt etget
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Noise - dual sim wifi phone Manufacturer - China cheapest dual sim mobile by QRT ETGET
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| Article Posted: 04/07/2011 |
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Subjective distinctions Calling some signal or sound noise is often a subjective distinction. One person's maximum-volume music listening pleasure might be another's unbearable noise. An annoying background hiss interfering with short-wave radio broadcasts was found to be due to extraterrestrial, indeed cosmic, processes; listening to this "noise" to the exclusion of all other signals with ever more sensitive antennae and receivers is now the science of radio astronomy. Radio astronomers are still plagued by noise in their signalsut now it is thermal noise generated in their equipment interfering with wanted signals from the cosmos. Acoustic 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 dogs barking, neighbours playing loud music, road traffic sounds, chainsaws, or aircraft, spoiling the quiet of the countryside. Acoustic noise can be anything from low-level but annoying to loud and harmful. At one extreme users of public transport sometimes complain about the faint and tinny sounds emanating from the headphones or earbuds of somebody listening to a portable audio player; at the other the sound of very loud music, a jet engine at close quarters, etc. can cause permanent irreversible hearing damage. Regulation of acoustic noise Main article: Noise regulation Noise regulation includes statutes or guidelines relating to sound transmission established by national, state or provincial and municipal levels of government. After a watershed passage of the U.S. Noise Control Act of 1972, the program was abandoned at the federal level, under President Ronald Reagan, in 1981 and the issue was left to local and state governments. Although the UK and Japan enacted national laws in 1960 and 1967 respectively, these laws were not at all comprehensive or fully enforceable as to address (a) generally rising ambient noise (b) enforceable numerical source limits on aircraft and motor vehicles or (c) comprehensive directives to local government. Acoustic noise in film sound For film sound theorists and practitioners at the advent of talkies c.1928/1929, noise was non-speech sound or natural sound and for many of them noise (especially asynchronous use with image) was desired over the evils of dialogue synchronized to moving image. The director and critic Ren Clair writing in 1929 makes a clear distinction between film dialogue and film noise and very clearly suggests that noise can have meaning and be interpreted: "...it is possible that an interpretation of noises may have more of a future in it. Sound cartoons, using "real" noises, seem to point to interesting possibilities" ('The Art of Sound' (1929)). Alberto Cavalcanti uses noise as a synonym for natural sound ('Sound in Films' (1939)) and as late as 1960, Siegfried Kracauer was referring to noise as non-speech sound ('Dialogue and Sound' (1960)). Audio noise Main article: Colors of noise In audio, recording, and broadcast systems audio noise refers to the residual low level sound (usually hiss and hum) that is heard in quiet periods of programme. In audio engineering it can also refer to the unwanted residual electronic noise signal that gives rise to acoustic noise heard as "hiss". This signal noise is commonly measured using A-weighting or ITU-R 468 weighting Non-acoustic noise Electronic noise Main article: Noise (electronics) Electronic noise exists in all circuits and devices as a result of thermal noise, also referred to as Johnson Noise. It is caused by random variations in current or voltage caused by the random movement of charge carriers (usually electrons) carrying the current as they are jolted around by thermal energy. Thermal noise can be reduced by reducing the temperature of the circuit. This 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 space, use front-end low-noise amplifier circuits cooled with liquid nitrogen. There are several other sources of noise in electronic circuits such as shot noise, seen in very low-level signals where the finite number of energy-carrying particles becomes significant, or flicker noise (1/f noise) in semiconductor devices. Visual noise Main article: Image noise Noise is also present in images. Electronic noise will be present in camera sensors, and the physical size of the grains of film emulsion creates visual noise. This kind of noise is referred to as "grain." Noise is also used in the creation of 2D and 3D images by computer. Sometimes noise is added to images to hide the sudden transitions inherent in digital representation of color, known as "banding." This adding of noise is referred to as "dithering." Sometimes noise is used to create the subject matter itself. Procedural noise (such as Perlin noise) is often used to create natural-looking variation in computer generated images. Noisy genes Main article: Transcriptional noise The activity and regulation of our genes are also subject to noise. Transcriptional noise refers to the variability in gene activity between cells in genetically identical populations (even identical twins are non-identical). Noise in gene activity has tremendous consequences on cell behaviour, and must be mitigated or integrated. Noise impacts upon the effectiveness of clinical treatment, with resistance of bacteria to antibiotics demonstrably caused by non-genetic differences. Variability in gene expression may also contribute to resistance of sub-populations of cancer cells to chemotherapy. In certain contexts, such as the survival of microbes in rapidly changing stressful environments, or several types of scattered differentiation, noise may be essential. See also Noise and vibration on maritime vessels Noise music Noise pollution Association of Noise Consultants Opposite: Silence Additional reading Kosko, Bart (2006). Noise. Viking Press. ISBN 0-670-03495-9. References Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (August 2008) External links Look up noise in Wiktionary, the free dictionary. Wikiquote has a collection of quotations related to: Sound Guidelines for Community Noise, World Health Organization, 1999 Audio Measuring Articles - Electronics Mohr on Receiver Noise: Characterization, Insights & Surprises Noise voltage - Calculation and Measuring of Thermal Noise Noise at work European Agency for Safety and Health at Work (EU-OSHA) Article "Noise Control Techniques" US National Institute for Occupational Safety and Health, - Noise Categories: Noise Noise pollution SoundHidden categories: Articles lacking sources from August 2008 All articles lacking sources We are high quality suppliers, our products such as dual sim wifi phone Manufacturer , China cheapest dual sim mobile for oversee buyer. 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