News tagged with decibels
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 |
4.2 / 5 (6) |
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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 |
4.8 / 5 (6) |
4
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How hummingbirds produce fluttering sounds during courtship
Though famous for their mid-air hovering during hunting, tiny hummingbirds have another trait that is literally telltale: males of some hummingbird species generate loud sounds with their tail feathers while ...
Sep 08, 2011 |
not rated yet |
0
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Tiny water boatman is a champion singer
(PhysOrg.com) -- Researchers studying the lesser water boatman have discovered that adjusting for size, M. scholtzi, a tiny freshwater bug, is the apparent world champion at producing the loudest noise. At onl ...
Jun 20, 2011 |
not rated yet |
1
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Temperatures and wind conditions move traffic noise
(PhysOrg.com) -- Imagine sitting down for your early morning coffee when your nice little suburban morning is disrupted by the sound of highway traffic from a quarter mile away. When you purchased your home ...
May 25, 2011 |
5 / 5 (1) |
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Voice-based phone recharging
(PhysOrg.com) -- The noise that we produce can be a lot of things. It can be a valid means of communication. It can be an annoyance when you are trying to get to bed at night. It can be a migraine waiting ...
Technology / Hi Tech & Innovation
May 10, 2011 |
3.4 / 5 (5) |
8
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Traffic noise increases the risk of having a stroke
Exposure to noise from road traffic can increase the risk of stroke, particularly in those aged 65 years and over, according to a study published online today (Wednesday 26 January) in the European Heart Journal.
Jan 26, 2011 |
5 / 5 (1) |
3
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Apple wins iPod hearing loss lawsuit
A US appeals court on Wednesday upheld the dismissal of a class action lawsuit filed against Apple Inc. which claimed the iPod was defective and could cause hearing loss.
Dec 31, 2009 |
5 / 5 (2) |
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Fujitsu Develops Millimeter-Wave Gallium-Nitride Transceiver Amplifier Chipset
Fujitsu announced today the development of the world's first gallium-nitride HEMT-based transceiver amplifier chipset for broadband wireless transmission equipment operating in the millimeter bandwidth, the ...
Sep 30, 2009 |
3 / 5 (1) |
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Decibel
The decibel (dB) is a logarithmic unit that indicates the ratio of a physical quantity (usually power or intensity) relative to a specified or implied reference level. A ratio in decibels is ten times the logarithm to base 10 of the ratio of two power quantities. A decibel is one tenth of a bel, a seldom-used unit.
The decibel is used for a wide variety of measurements in science and engineering, most prominently in acoustics, electronics, and control theory. In electronics, the gains of amplifiers, attenuation of signals, and signal-to-noise ratios are often expressed in decibels. The decibel confers a number of advantages, such as the ability to conveniently represent very large or small numbers, and the ability to carry out multiplication of ratios by simple addition and subtraction.
The decibel symbol is often qualified with a suffix, that indicates which reference quantity or frequency weighting function has been used. For example, dBm indicates a reference level of one milliwatt, while dBu is referenced to 0.775 volts RMS.
The definitions of the decibel and bel use base 10 logarithms. The neper, an alternative logarithmic ratio unit sometimes used, uses the natural logarithm (base e).
A change in power ratio by a factor of 10 is a 10 dB change. A change in power ratio by a factor of two is approximately a 3 dB change.
For more information about Decibel, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
