Definitions for Decibel
ˈdɛs əˌbɛl, -bəldeci·bel

Princeton's WordNetRate this definition:0.0 / 0 votes

1. decibel, dBnoun

   a logarithmic unit of sound intensity; 10 times the logarithm of the ratio of the sound intensity to some reference intensity

WiktionaryRate this definition:0.0 / 0 votes

1. decibelnoun

   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(P /P ), where P and P are the relative powers of the sound.

WikipediaRate this definition:0.0 / 0 votes

1. Decibel

   The decibel (symbol: dB) is a relative unit of measurement equal to one tenth of a bel (B). It expresses the ratio of two values of a power or root-power quantity on a logarithmic scale. Two signals whose levels differ by one decibel have a power ratio of 101/10 (approximately 1.26) or root-power ratio of 101⁄20 (approximately 1.12).The unit expresses a relative change or an absolute value. In the latter case, the numeric value expresses the ratio of a value to a fixed reference value; when used in this way, the unit symbol is often suffixed with letter codes that indicate the reference value. For example, for the reference value of 1 volt, a common suffix is "V" (e.g., "20 dBV").Two principal types of scaling of the decibel are in common use. When expressing a power ratio, it is defined as ten times the logarithm in base 10. That is, a change in power by a factor of 10 corresponds to a 10 dB change in level. When expressing root-power quantities, a change in amplitude by a factor of 10 corresponds to a 20 dB change in level. The decibel scales differ by a factor of two, so that the related power and root-power levels change by the same value in linear systems, where power is proportional to the square of amplitude. The definition of the decibel originated in the measurement of transmission loss and power in telephony of the early 20th century in the Bell System in the United States. The bel was named in honor of Alexander Graham Bell, but the bel is seldom used. Instead, 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.

WikidataRate this definition:0.0 / 0 votes

1. Decibel

   The decibel is a logarithmic unit that indicates the ratio of a physical quantity 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 named in honor of Alexander Graham Bell. 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. 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. 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 approximately 0.775 volts RMS.

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1. decibel

   Song lyrics by decibel -- Explore a large variety of song lyrics performed by decibel on the Lyrics.com website.

Matched Categories

1. • Sound Unit

How to pronounce Decibel?

1. Alex

   US English

   David

   US English

   Mark

   US English

   Daniel

   British

   Libby

   British

   Mia

   British

   Karen

   Australian

   Hayley

   Australian

   Natasha

   Australian

   Veena

   Indian

   Priya

   Indian

   Neerja

   Indian

   Zira

   US English

   Oliver

   British

   Wendy

   British

   Fred

   US English

   Tessa

   South African

How to say Decibel in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of Decibel in Chaldean Numerology is: 5

2. Pythagorean Numerology

   The numerical value of Decibel in Pythagorean Numerology is: 4

Examples of Decibel in a Sentence

1. Matthew Terrell:

   People weren't wearing hearing protection, it's like being right next to a speaker at a rock concert, you can't yell over a 120-decibel megaphone.

2. Jochen Hermann:

   We want the car to be as quiet as possible from the interior, but there are rules for sound decibel levels for the exterior, we picked an acoustic signal for the EQC about a year ago and made a choice between three different sounds.

3. Mike Braun:

   I think yes it probably will make the dynamic different, i'm not going to deny it's going to change the decibel level and probably the intensity of which we go about talking about witnesses.

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References

1. ^ Princeton's WordNet
   http://wordnetweb.princeton.edu/perl/webwn?s=Decibel
2. ^ Wiktionary
   https://en.wiktionary.org/wiki/Decibel
3. ^ Wikipedia
   https://en.wikipedia.org/wiki/Decibel
4. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=Decibel