(Medical Xpress) -- A new study presented at the 162nd Meeting of the Acoustical Society of America shows that students testing scores are negatively affected by background noise, but not the noise you would expect. The background ...
(Medical Xpress)—Does your child or teen spend hours "plugged in" to an iPod? Tuning out may be doing more than irritating parents. It is estimated that almost 12 percent of all children between the ages of 6-19 have noise ...
Feb 20, 2014
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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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Scientists working with deaf gerbils said on Wednesday they had found a way of coaxing early stem cells into specialised ear cells that helped the rodents hear sound once more.
Sep 12, 2012
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Turning the volume up too high on your headphones can damage the coating of nerve cells, leading to temporary deafness; scientists from the University of Leicester have shown for the first time.
Aug 29, 2012
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Fireworks displays are an American summertime tradition, but while the spectacular colorful displays are visually pleasing, a Purdue University audiology instructor says the loud booms that accompany them are a problem for ...
Jun 27, 2018
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The Memorial Day parade. Road and building construction. Fourth of July fireworks. Outdoor rock concerts.
May 25, 2015
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(HealthDay)—Some of the most common sounds of summer—such as outdoor concerts, fireworks and construction—can pose a threat to your hearing if you don't take steps to protect yourself, an expert warns.
Jun 27, 2014
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(Medical Xpress) -- Summer can be really fun, but also quite noisy. And with 4th of July coming up, the fireworks can reach 150 decibels. While the pyrotechnic displays are exhilarating to watch, hearing experts hope you'll ...
Jun 26, 2012
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Admiring fireworks from afar sounds like the best plan, according to a Purdue audiologist.
Jun 22, 2017
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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.
This text uses material from Wikipedia, licensed under CC BY-SA
