## DECIBEL

### Decibel

The**decibel**is a logarithmic unit used to express the ratio between two values of a physical quantity . One of these quantities is often a reference value, and in this case the dB can be used to express the absolute level of the physical quantity. The decibel is also commonly used as a measure of gain or attenuation, the ratio of input and output powers of a system, or of individual factors that contribute to such ratios. The number of decibels is ten times the logarithm to base 10 of the ratio of the two power quantities. A decibel is one tenth of a

**bel**, a seldom-used unit named in honor of Alexander Graham Bell.

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### decibel

#### Noun

- A common measure of sound intensity that is one tenth of a bel on the logarithmic intensity scale. It is defined as dB = 10 * log
_{10}(P_{1}/P_{2}), where P_{1}and P_{2}are the relative powers of the sound.

*The above text is a snippet from Wiktionary: decibel*

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and as such is available under the Creative Commons Attribution/Share-Alike License.