News tagged with noise
Genes linked to cancer could be easier to detect with liquid lasers
Using a liquid laser, University of Michigan researchers have developed a better way to detect the slight genetic mutations that might predispose a person to a particular type of cancer or other diseases.
Chemistry / Analytical Chemistry
Jan 31, 2012 |
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The many unexpected sides of romantic love
Love can bring out both the best and the worst in people. Which way it turns depends on the best way to protect the relationship, say researchers studying the evolution of romantic love.
Medicine & Health / Psychology & Psychiatry
Jan 30, 2012 |
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Giant optical gain in a rare-earth-ion-doped microstructure
Prof. Markus Pollnau and co-workers at the MESA+ Institute for Nanotechnology at the University of Twente (The Netherlands) have developed a rare-earth-ion-doped optical amplifier with performance comparable to semiconductor ...
Jan 12, 2012 |
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Stallone film in Bulgaria 'vandalised' bat colonies: experts
Bat experts have slammed the recent filming of a Sylvester Stallone movie in a Bulgarian cave, saying thousands of the mammals had suffered from the Hollywood treatment.
Dec 22, 2011 |
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Do you hear what I hear? Noise exposure surrounds us
Nine out of 10 city dwellers may have enough harmful noise exposure to risk hearing loss, and most of that exposure comes from leisure activities.
Dec 21, 2011 |
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Researchers urge caution when buying noisy toys
While Road Rippers Lightning Rods, Let's Rock Elmo and the I Am T-Pain musical microphone might be sought-after gifts this holiday season, parents should ensure that their children don't risk permanent hearing damage by misusing ...
Dec 16, 2011 |
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Finnish team devise nanomechanical microwave amplifier with near least possible noise generation
(PhysOrg.com) -- A team of Finnish physicists has developed a novel way to amplify a microwave signal that unlike other amplifiers, produces noise that is just barely above that which is necessary due to the ...
Dec 15, 2011 |
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Apple seeks patents for display and noise-out systems
(PhysOrg.com) -- Apple made patent news this week in two directions, toward a Kinect like system and toward a quest for excellence in sound quality on phones. It’s been reported that Apple has filed patent ...
Technology / Hi Tech & Innovation
Dec 11, 2011 |
3 / 5 (15) |
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Ocean cacophony a torment for sea mammals
With the constant churn of freighter propellers, the percussive thump of oil and gas exploration and the underwater din of military testing, ocean noise levels have become unbearable for some sea mammals.
Dec 07, 2011 |
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Research focuses on implementing radio frequency MEMS resonators on a silicon chip
Semiconductor Research Corporation and Cornell University researchers are working to advance on-chip silicon development to enable new generations of smaller and more sophisticated mobile electronic devices.
Dec 06, 2011 |
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Random noise helps make signals clearer
Scientists have shown the energy conditions, under which a weak signal supplied to a physical system emerges as a stronger signal at the output thanks to the presence of random noise (a process known as stochastic resonance), ...
Dec 06, 2011 |
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Dyslexic adults have more trouble if background noise levels are high
Dyslexia affects up to 17.5% of the population, but its cause remains somewhat unknown. A report published in the Nov. 23 issue of the online journal PLoS ONE supports the hypothesis that the symptoms of dyslexia, includ ...
Nov 23, 2011 |
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Scientists watch birth of huge Antarctic iceberg
A new iceberg is forming in western Antarctica, and it's a big one.
Space & Earth / Earth Sciences
Nov 17, 2011 |
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Adding up photons with a transition edge sensor
(PhysOrg.com) -- Scientists have demonstrated that a superconducting detector called a transition edge sensor (TES) is capable of counting the number of as many as 1,000 photons in a single pulse of light ...
Nov 14, 2011 |
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Large birds with low-frequency songs are less likely to nest near noisy sites
A growing body of evidence shows that man-made noise is bad for birds, but some species are harder hit than others — particularly bigger birds with low-frequency songs, finds a new study.
Nov 09, 2011 |
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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.
