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- Decibel abstract "The decibel (dB) is a logarithmic unit that expresses the ratio of two values of a physical quantity, often power or intensity. One of these quantities is often a reference value and in this case the decibel expresses the absolute level of the physical quantity. 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 is a 10 dB change. At the half power point an audio circuit or an antenna exhibits an attenuation of 3dB. A change in voltage by a factor of 10 results in a change in power by a factor of 100, which is a 20 dB change. A change in voltage ratio by a factor of two approximately corresponds to a 6 dB change.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 "54887".
- Decibel wikiPageOutDegree "218".
- Decibel wikiPageRevisionID "679147430".
- Decibel wikiPageWikiLink 3dB-point.
- 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_(electronics).
- Decibel wikiPageWikiLink Antenna_(radio).
- Decibel wikiPageWikiLink Antenna_aperture.
- Decibel wikiPageWikiLink Antenna_effective_area.
- Decibel wikiPageWikiLink Antenna_factor.
- Decibel wikiPageWikiLink Antenna_gain.
- Decibel wikiPageWikiLink Antenna_gain-to-noise-temperature.
- Decibel wikiPageWikiLink Apparent_magnitude.
- Decibel wikiPageWikiLink Arithmetic.
- Decibel wikiPageWikiLink Arithmetic_average.
- Decibel wikiPageWikiLink Attenuation.
- Decibel wikiPageWikiLink Attenuator_(electronics).
- Decibel wikiPageWikiLink Audiogram.
- Decibel wikiPageWikiLink Average.
- Decibel wikiPageWikiLink Base-10_logarithm.
- Decibel wikiPageWikiLink Bell_Labs.
- Decibel wikiPageWikiLink Bell_System.
- Decibel wikiPageWikiLink Bode_plot.
- Decibel wikiPageWikiLink Broadcast.
- Decibel wikiPageWikiLink Broadcasting.
- Decibel wikiPageWikiLink CCD_imager.
- 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 DBu.
- Decibel wikiPageWikiLink Decade_(log_scale).
- Decibel wikiPageWikiLink Deci-.
- Decibel wikiPageWikiLink Decibel.
- Decibel wikiPageWikiLink Deprecation.
- Decibel wikiPageWikiLink Dimensional_analysis.
- Decibel wikiPageWikiLink Dimensional_homogeneity.
- Decibel wikiPageWikiLink Dipole_antenna.
- Decibel wikiPageWikiLink Dynamic_range.
- Decibel wikiPageWikiLink E_(mathematical_constant).
- Decibel wikiPageWikiLink Electric_current.
- Decibel wikiPageWikiLink Electric_field.
- Decibel wikiPageWikiLink Electric_field_strength.
- Decibel wikiPageWikiLink Electrical_impedance.
- Decibel wikiPageWikiLink Electronic_circuit.
- Decibel wikiPageWikiLink Electronic_component.
- Decibel wikiPageWikiLink Electronics.
- Decibel wikiPageWikiLink Engineering.
- Decibel wikiPageWikiLink Equal-loudness_contour.
- Decibel wikiPageWikiLink F-number.
- Decibel wikiPageWikiLink F-stop.
- Decibel wikiPageWikiLink Femtowatt.
- Decibel wikiPageWikiLink Fiber_optics.
- 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 Free_space_optical_communication.
- Decibel wikiPageWikiLink Frequency_weighting.
- Decibel wikiPageWikiLink Full_scale.
- Decibel wikiPageWikiLink T.
- Decibel wikiPageWikiLink Gain_(electronics).
- Decibel wikiPageWikiLink Half_power_point.
- Decibel wikiPageWikiLink Hertz.
- Decibel wikiPageWikiLink IEC_60027.
- Decibel wikiPageWikiLink IEC_60027-3.
- Decibel wikiPageWikiLink IEC_80000.