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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

created Jan 31, 2012 | popularity 4.8 / 5 (4) | comments 0 | with audio podcast

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

created Jan 30, 2012 | popularity 5 / 5 (1) | comments 1

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 ...

Chemistry / Materials Science

created Jan 12, 2012 | popularity 5 / 5 (1) | comments 1

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.

Biology / Ecology

created Dec 22, 2011 | popularity 4 / 5 (1) | comments 13

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.

Medicine & Health / Health

created Dec 21, 2011 | popularity not rated yet | comments 1 | with audio podcast

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 ...

Medicine & Health / Health

created Dec 16, 2011 | popularity not rated yet | comments 0

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 ...

Physics / General Physics

created Dec 15, 2011 | popularity 4.8 / 5 (6) | comments 4 | with audio podcast report

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

created Dec 11, 2011 | popularity 3 / 5 (15) | comments 19 | with audio podcast weblog

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.

Biology / Plants & Animals

created Dec 07, 2011 | popularity 5 / 5 (1) | comments 0

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.

Technology / Semiconductors

created Dec 06, 2011 | popularity 5 / 5 (1) | comments 0

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), ...

Physics / General Physics

created Dec 06, 2011 | popularity 5 / 5 (2) | comments 3

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 ...

Medicine & Health / Diseases

created Nov 23, 2011 | popularity 4.5 / 5 (2) | comments 1

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

created Nov 17, 2011 | popularity 4.8 / 5 (4) | comments 0

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 ...

Physics / Optics & Photonics

created Nov 14, 2011 | popularity 5 / 5 (1) | comments 1 | with audio podcast

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.

Biology / Ecology

created Nov 09, 2011 | popularity not rated yet | comments 0

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.