Traduction et analyse de mots par intelligence artificielle ChatGPT
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Qu'est-ce (qui) est DBD - définition
.jpg?width=200 "Examples of sound levels in decibels from various sound sources and activities, taken from the \"How loud is too loud\" screen of the NIOSH Sound Level Meter app")
![A schematic showing the relationship between [[dBu]] (the [[voltage source]]) and [[dBm]] (the power dissipated as [[heat]] by the 600 Ω [[resistor]])](https://commons.wikimedia.org/wiki/Special:FilePath/Relationship between dBu and dBm.png?width=200 "A schematic showing the relationship between [[dBu]] (the [[voltage source]]) and [[dBm]] (the power dissipated as [[heat]] by the 600 Ω [[resistor]])")
![A dielectric barrier discharge produced using [[mica]] sheets as [[dielectric]], put on two steel plates as electrode. The discharge is taking place in normal atmospheric air, at about 30 kHz, with a discharge gap of about 4 mm. The ''foot'' of the discharge is the charge accumulation on the barrier surface.](https://commons.wikimedia.org/wiki/Special:FilePath/Filamentous Dielectric Barrier Discharge.JPG?width=200 "A dielectric barrier discharge produced using [[mica]] sheets as [[dielectric]], put on two steel plates as electrode. The discharge is taking place in normal atmospheric air, at about 30 kHz, with a discharge gap of about 4 mm. The ''foot'' of the discharge is the charge accumulation on the barrier surface.")
Wikipédia
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.
