News tagged with noise
Quantum computer leap
(Phys.org) -- The main technical difficulty in building a quantum computer could soon be the thing that makes it possible to build one, according to new research from The Australian National University.
May 18, 2012 |
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Frequency stabilization in nonlinear nanomechanical oscillators
Using Center for Nanoscale Materials (CNM) expertise in the design and fabrication of micro- and nanoscale devices, a new strategy for engineering low-frequency noise oscillators capitalizes on the intrinsic ...
May 28, 2012 |
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All-optical quantum computation, step 1: A controlled-NOT photonic gate
(PhysOrg.com) -- The often counterintuitive quantum world of superposition, entanglement, and tunneling can greatly enhance applications as diverse as communication, information processing, and precision measurement. ...
Jun 24, 2011 |
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Research: Too much, too little noise turns off consumers, creativity
The sound of silence isn't so golden for consumers, and both marketers and advertisers should take note, says new research from a University of Illinois expert in new product development and marketing.
Other Sciences / Social Sciences
May 14, 2012 |
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Stanford computer scientists find Internet security flaw
(PhysOrg.com) -- Researchers at the Stanford Security Laboratory create a computer program to defeat audio captchas on website account registration forms, revealing a design flaw that leaves them vulnerable ...
Technology / Computer Sciences
May 24, 2011 |
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Hollywood movies follow a mathematical formula
(PhysOrg.com) -- Hollywood movies have found a mathematical formula that lets them match the effects of their shots to the attention spans of their audiences.
Feb 19, 2010 |
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Bring in the (nano) noise
(PhysOrg.com) -- At the forefront of nanotechnology, researchers design miniature machines to do big jobs, from treating diseases to harnessing sunlight for energy. But as they push the limits of this technology, ...
May 27, 2011 |
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Researches quiet combustion with patented 'noise sponge'
(Phys.org) -- A sponge-like material employed by a University of Alabama engineering professor can significantly quiet combustion, possibly making work environments safer and extending the life of equipment.
May 01, 2012 |
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Physicists Show that Correlated Environmental Variations Can Quicken Extinctions
(PhysOrg.com) -- In general, population extinction is a natural process. For one reason or another, an estimated 99.9% of all species that have lived on Earth are now extinct. However, the reasons for a species ...
Jan 13, 2009 |
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Controlling the interaction between light and matter
(PhysOrg.com) -- "One of the most exciting things about this is that it gives us nice, clean control over the interaction between light and matter," William Kelly tells PhysOrg.com. "Our technique has the potential to giv ...
Apr 30, 2010 |
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Rebooting the brain helps stop the ring of tinnitus in rats
(PhysOrg.com) -- Researchers were able to eliminate tinnitus in a group of rats by stimulating a nerve in the neck while simultaneously playing a variety of sound tones over an extended period of time, says a study published ...
Medicine & Health / Neuroscience
Jan 12, 2011 |
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New Amplifier Pushes the Boundary of Quantum Physics
(PhysOrg.com) -- If powerful new quantum computers are to reach their enormous potential, they will need amplifiers capable of transmitting signals so weak they consist of a single photon. In the May 6 edition ...
May 05, 2010 |
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Random numbers game with quantum dice
(PhysOrg.com) -- A simple device measures the quantum noise of vacuum fluctuations and generates true random numbers.
Sep 09, 2010 |
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Fastest random number generator: Sounds of silence proving a hit
(Phys.org) -- Researchers at The Australian National University have developed the fastest random number generator in the world by listening to the 'sounds of silence'.
Apr 11, 2012 |
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Bland-tasting food? It could be the background noise
(PhysOrg.com) -- Air travelers have long complained of the blandness of airline food, but new research suggests the aircraft noise may be the problem rather than the chefs or the menu.
Oct 15, 2010 |
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Noise
In common use, the word noise means any unwanted sound. In both analog and digital electronics, noise is random unwanted perturbation to a wanted signal; it is called noise as a generalisation of the acoustic noise ("static") heard when listening to a weak radio transmission with significant electrical noise. Signal noise is heard as acoustic noise if the signal is converted into sound (e.g., played through a loudspeaker); it manifests as "snow" on a television or video image. High noise levels can block, distort, change or interfere with the meaning of a message in human, animal and electronic communication.
In signal processing or computing it can be considered random unwanted 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. "Signal-to-noise ratio" is sometimes used to refer to the ratio of useful to irrelevant information in an exchange.
In biology, noise can describe the variability of a measurement around the mean, for example transcriptional noise describes the variability in gene activity between cells in a population.
In many cases, the special case of thermal noise arises, which sets a fundamental lower limit to what can be measured or signaled and is related to basic physical processes described by thermodynamics, some of which are expressible by simple formulae.
In some fields, noise means unwanted information or data that is not relevant to the hypothesis or theory being investigated or tested.
For more information about Noise, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
