News tagged with noise

Optimized perception in the twilight zone

In the pre-industrial age, twilight was a dangerous time for humans due to higher risk of encountering nocturnal predators. The ability to see in weak light conditions was therefore at a clear evolutionary advantage. Neuroscientists ...

Apr 11, 2018
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How technology can help you get a better night's sleep

It's smart to turn off mobile devices and other small screens at least an hour before bedtime, but technology can also help us power down for a good night's sleep, says expert Cary Brown, a researcher in the University of ...

Mar 16, 2018
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How the brain represents sound elevation

Changing the shape of human participants' ears has provided new insight into how the brain represents the location of a sound source. The research, published in JNeurosci, highlights the link between sensory encoding and ...

Mar 05, 2018
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Trains, planes, automobiles and heart disease

Noise may disrupt the body on the cellular level in a way that increases the risk of common heart disease risk factors, according to a review topic published today in the Journal of the American College of Cardiology that ...

Feb 05, 2018
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Your next hearing aid could be a video game

Roughly 15 percent of Americans report some sort of hearing difficulty; trouble understanding conversations in noisy environments is one of the most common complaints. Unfortunately, there's not much doctors or audiologists ...

Feb 05, 2018
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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.

This text uses material from Wikipedia, licensed under CC BY-SA

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