Consumer & Gadgets

Raspberry Pi unveils $50 interchangeable-lens camera board

Raspberry Pi's new high quality camera doesn't sport a fancy name—it's actually called "High Quality Camera"—but it packs some new features do-it-yourselfers are sure to enjoy, and it's being offered at Raspberry's typical ...

Robotics

Robotic bees are joining the International Space Station

"There are some things only humans can do in space. The rest can be left to robots." The NASA team is showcasing hw to put that simple observation into interesting practice with their development of Astrobees.

Hi Tech & Innovation

A short first hop for 'drone taxi' in Vienna

It was more of a small step than a giant leap, but the first public outing of a pilotless "drone taxi" in Vienna on Thursday nevertheless offered a glimpse into the possible future of urban travel.

Telecom

Compact amplifier could revolutionise optical communication

Researchers at Chalmers University of Technology, Sweden, present a unique optical amplifier that is expected to revolutionize both space and fiber communication. The new amplifier offers high performance, is compact enough ...

Consumer & Gadgets

Team develops bracelet that jams microphones

The very topic of digital assistants and home smart devices sporting microphones and the potential for the outside world to listen in on recordings is not a comfortable one, to say the least. It's no longer a simple case ...

Computer Sciences

Harnessing noise in optical computing for AI

Artificial intelligence and machine learning are currently affecting our lives in many small but impactful ways. For example, AI and machine learning applications recommend entertainment we might enjoy through streaming services ...

Consumer & Gadgets

Facebook customizes augmented reality to the flick of a wrist

Fresh off its recent augmented reality (AR) kick, Facebook Labs has revealed plans to curate this AI software for wearable devices. Projected as a shorter-term goal than the previously announced AR glasses, this wrist-based ...

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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