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- Decibel abstract "The decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical quantity, often power or intensity. One of these values is often a standard reference value, in which case the decibel is used to express the level of the other value relative to this reference. The number of decibels is ten times the logarithm to base 10 of the ratio of two power quantities, or of the ratio of the squares of two field amplitude quantities. One decibel is one tenth of one bel, named in honor of Alexander Graham Bell; however, the bel is seldom used.The definition of the decibel is based on the measurement of power in telephony of the early 20th century in the Bell System in the United States. Today, the unit 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. By contrast, use of the decibel complicates operations of addition and subtraction.A change in power by a factor of 10 corresponds to a 10 dB change in level. At the half power point an audio circuit or an antenna exhibits an attenuation of approximately 3dB. A change in voltage by a factor of 10 results in a change in power by a factor of 100, which corresponds to a 20 dB change in level. A change in voltage ratio by a factor of 2 (equivalently factor of 4 in power change) approximately corresponds to a 6 dB change in level.The decibel symbol is often qualified with a suffix that indicates the reference quantity that has been used or some other property of the quantity being measured. For example, dBm indicates a reference power of one milliwatt, while dBu is referenced to approximately 0.775 volts RMS.In the International System of Quantities, the decibel is defined as a unit of measurement for quantities of type level or level difference, which are defined as the logarithm of the ratio of power- or field-type quantities.".
- Decibel wikiPageExternalLink dB.html.
- Decibel wikiPageExternalLink calculator-soundlevel.htm.
- Decibel wikiPageExternalLink owadisp.show_document?p_table=STANDARDS&p_id=9735.
- Decibel wikiPageID "8410".
- Decibel wikiPageLength "55045".
- Decibel wikiPageOutDegree "218".
- Decibel wikiPageRevisionID "706569474".
- Decibel wikiPageWikiLink A-weighting.
- Decibel wikiPageWikiLink Absolute_threshold_of_hearing.
- Decibel wikiPageWikiLink Absorbance.
- Decibel wikiPageWikiLink Acoustics.
- Decibel wikiPageWikiLink Alexander_Graham_Bell.
- Decibel wikiPageWikiLink Amplifier.
- Decibel wikiPageWikiLink Amplitude.
- Decibel wikiPageWikiLink Antenna_(radio).
- Decibel wikiPageWikiLink Antenna_aperture.
- Decibel wikiPageWikiLink Antenna_factor.
- Decibel wikiPageWikiLink Antenna_gain.
- Decibel wikiPageWikiLink Antenna_gain-to-noise-temperature.
- Decibel wikiPageWikiLink Apparent_magnitude.
- Decibel wikiPageWikiLink Arithmetic.
- Decibel wikiPageWikiLink Attenuation.
- Decibel wikiPageWikiLink Attenuator_(electronics).
- Decibel wikiPageWikiLink Audiogram.
- Decibel wikiPageWikiLink Average.
- Decibel wikiPageWikiLink Bell_Labs.
- Decibel wikiPageWikiLink Bell_System.
- Decibel wikiPageWikiLink Bode_plot.
- Decibel wikiPageWikiLink Broadcasting.
- Decibel wikiPageWikiLink Cable_television.
- Decibel wikiPageWikiLink Capacitance.
- Decibel wikiPageWikiLink Carrier-to-noise_ratio.
- Decibel wikiPageWikiLink Carrier-to-receiver_noise_density.
- Decibel wikiPageWikiLink Category:Acoustics.
- Decibel wikiPageWikiLink Category:Audio_electronics.
- Decibel wikiPageWikiLink Category:Logarithmic_scales_of_measurement.
- Decibel wikiPageWikiLink Category:Radio_frequency_propagation.
- Decibel wikiPageWikiLink Category:Telecommunications_engineering.
- Decibel wikiPageWikiLink Category:Units_of_measurement.
- Decibel wikiPageWikiLink Cent_(music).
- Decibel wikiPageWikiLink Charge-coupled_device.
- Decibel wikiPageWikiLink Circuit_noise_level.
- Decibel wikiPageWikiLink Circular_polarization.
- Decibel wikiPageWikiLink Clipping_(signal_processing).
- Decibel wikiPageWikiLink Coaxial_cable.
- Decibel wikiPageWikiLink Common_logarithm.
- Decibel wikiPageWikiLink Communications_satellite.
- Decibel wikiPageWikiLink Control_theory.
- Decibel wikiPageWikiLink DBFS.
- Decibel wikiPageWikiLink DBZ_(meteorology).
- Decibel wikiPageWikiLink DB_drag_racing.
- Decibel wikiPageWikiLink DBc.
- Decibel wikiPageWikiLink DBm.
- Decibel wikiPageWikiLink DBrn.
- Decibel wikiPageWikiLink Decade_(log_scale).
- Decibel wikiPageWikiLink Deci-.
- Decibel wikiPageWikiLink Decibel.
- Decibel wikiPageWikiLink Deprecation.
- Decibel wikiPageWikiLink Dimensional_analysis.
- Decibel wikiPageWikiLink Dipole_antenna.
- Decibel wikiPageWikiLink Dynamic_range.
- Decibel wikiPageWikiLink E_(mathematical_constant).
- Decibel wikiPageWikiLink Electric_current.
- Decibel wikiPageWikiLink Electric_field.
- Decibel wikiPageWikiLink Electrical_impedance.
- Decibel wikiPageWikiLink Electronic_circuit.
- Decibel wikiPageWikiLink Electronics.
- Decibel wikiPageWikiLink Engineering.
- Decibel wikiPageWikiLink Equal-loudness_contour.
- Decibel wikiPageWikiLink F-number.
- Decibel wikiPageWikiLink Field,_power,_and_root-power_quantities.
- Decibel wikiPageWikiLink Figure_of_merit.
- Decibel wikiPageWikiLink Fisher_equation.
- Decibel wikiPageWikiLink Fraction_(mathematics).
- Decibel wikiPageWikiLink Free-space_optical_communication.
- Decibel wikiPageWikiLink Full_scale.
- Decibel wikiPageWikiLink Gain_(electronics).
- Decibel wikiPageWikiLink Half_power_point.
- Decibel wikiPageWikiLink Hertz.
- Decibel wikiPageWikiLink IEC_60027.
- Decibel wikiPageWikiLink IEC_80000.
- Decibel wikiPageWikiLink ITU-R_468_noise_weighting.
- Decibel wikiPageWikiLink Image_sensor.
- Decibel wikiPageWikiLink Intensity_(physics).
- Decibel wikiPageWikiLink International_Advisory_Committee_on_Long_Distance_Telephony.
- Decibel wikiPageWikiLink International_Committee_for_Weights_and_Measures.
- Decibel wikiPageWikiLink International_Electrotechnical_Commission.
- Decibel wikiPageWikiLink International_Organization_for_Standardization.
- Decibel wikiPageWikiLink International_System_of_Quantities.
- Decibel wikiPageWikiLink International_System_of_Units.
- Decibel wikiPageWikiLink Isotropic_radiator.
- Decibel wikiPageWikiLink Joule.
- Decibel wikiPageWikiLink Kelvin.
- Decibel wikiPageWikiLink Level_(logarithmic_quantity).
- Decibel wikiPageWikiLink Linear_polarization.
- Decibel wikiPageWikiLink Link_budget.
- Decibel wikiPageWikiLink Linux.
- Decibel wikiPageWikiLink Logarithm.
- Decibel wikiPageWikiLink Logarithmic_mean.