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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).

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bel
0.1 bel
Named after
Alexander Graham Bell
Symbol
dB
Unit system
Non-SI metric unit

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Overview

History

Definition

Properties

Uses

Acoustics

Suffixes and reference values

Voltage

Audio electronics

Radar

Antenna measurements

Other measurements

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Decibel

Nodes182
Edges181
Triples133
Avg. degree1.99
Density0.010989
Components1

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Decibel

Top relations

related to Further reading · 20
Decibel → Archived, Brücke, Das Dezilog, December, Dezibel, Eugen, German, Karl, Logarithmen, Logarithms, Neper, Normzahlen, Paulin, PDF, Phon, Retrieved, September, The, Tuffentsammer, VDI-Zeitschrift
related to history · 15
Decibel → Alexander Graham Bell, Bell, Bell Telephone Laboratories, Europe, Hz, In, International Advisory Committee, It, Long Distance Telephony, MSC, The, Transmission Unit, TU, TUs, Until
related to Relationship between power and root-power levels · 14
Decibel → Although, An, F0, F1, F2, For, Fourier, Frequency-dependent, However, In, P0, P1, P2, This
related to Representation of multiplication operations · 8
Decibel → ABC, Broken, Calculated, For, Level, Practically, The, With
related to Power quantities · 7
Decibel → If, LP, Np, P0, The, Thus, When
related to Representation of addition operations · 7
Decibel → According, Addition, For, However, Mitschke, The, To
related to Video and digital imaging · 7
Decibel → CCD, However, In, Most, SNR, Sometimes, Thus
related to External links · 6
Decibel → Decibels, JOSHA Regulations, Occupational Noise ExposureWorking, RF, What, With
related to Acoustics · 5
Decibel → As, Probably, SPL, The, Use
related to Definition · 5
Decibel → Finally, Np, The, The IEC Standard, Therefore

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Important terminology

power db ratio level 10 root-power decibels unit reference used quantities ratios sound 20 value two voltage log quantity gain

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
Decibelbel0.1 bel1.00infobox
DecibelNamed afterAlexander Graham Bell1.00infobox
DecibelSymboldB1.00infobox
DecibelUnit systemNon-SI metric unit1.00infobox
the International Electrotechnical Commissioninstance ofthe decibel is recognized by other international bodies0.80text
when the medium is linearinstance ofA factor of 2 is introduced to make changes in the respective levels match under restricted conditions0.80text
the same waveform is under consideration with changes in amplitudeinstance ofA factor of 2 is introduced to make changes in the respective levels match under restricted conditions0.80text
or the medium impedance is linearinstance ofA factor of 2 is introduced to make changes in the respective levels match under restricted conditions0.80text
independent of both frequencyinstance ofA factor of 2 is introduced to make changes in the respective levels match under restricted conditions0.80text
timeinstance ofA factor of 2 is introduced to make changes in the respective levels match under restricted conditions0.80text
optical fiber communicationinstance ofin topics0.80text
radio propagation path lossinstance ofin topics0.80text

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