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Decibel - History of bels and decibels | A Wisdom Archive on Decibel - History of bels and decibels | | Decibel - History of bels and decibels A selection of articles related to Decibel - History of bels and decibels | |
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Decibel, Decibel - 6 dB per bit, Decibel - Absolute measurements, Decibel - Acoustics, Decibel - Definition, Decibel - Electronics, Decibel - History of bels and decibels, Decibel - Merits, Decibel - Optics, Decibel - Reckoning, Decibel - Reference, Decibel - Relative measurements, Decibel - Round numbers, Decibel - Seismology, Decibel - Standards, Decibel - Telecommunications, Decibel - The 4 → 6 energy rule, Decibel - The 789 rule, Decibel - Typical abbreviations, Decibel - Uses, Decibel - −3 dB ≈ ½ power, Equal-loudness contour, ITU-R 468 noise weighting, Noise (environmental), Signal noise, Sound pressure level, Weighting filter—discussion of <b>dBA</b>, Decibel magazine
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ARTICLES RELATED TO Decibel - History of bels and decibels | | | |  Decibel - History of bels and decibels: Encyclopedia II - Decibel - History of bels and decibelsA bel (symbol B) is a unit of measure of ratios, such as power levels and voltage levels. It is mostly used in telecommunication, electronics, and acoustics. Invented by engineers of the Bell Telephone Laboratory to quantify the reduction in audio level over a 1 mile length of standard telephone cable, it was originally called the transmission unit or TU, but was renamed in 1923 or 1924 in honor of the laboratory's found ...
See also:Decibel, Decibel - Definition, Decibel - Standards, Decibel - Merits, Decibel - History of bels and decibels, Decibel - Uses, Decibel - Acoustics, Decibel - Electronics, Decibel - Optics, Decibel - Telecommunications, Decibel - Seismology, Decibel - Typical abbreviations, Decibel - Absolute measurements, Decibel - Relative measurements, Decibel - Reckoning, Decibel - Round numbers, Decibel - The 4 → 6 energy rule, Decibel - The 789 rule, Decibel - −3 dB ≈ ½ power, Decibel - 6 dB per bit, Decibel - dB cheat sheet, Decibel - Reference Read more here: » Decibel: Encyclopedia II - Decibel - History of bels and decibels |
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| | | | Decibel - History of bels and decibels: Encyclopedia II - Decibel - History of bels and decibels A bel (symbol B) is a unit of measure of ratios, such as power levels and voltage levels. It is mostly used in telecommunication, electronics, and acoustics. Invented by engineers of the Bell Telephone Laboratory to quantify the reduction in audio level over a 1 mile length of standard telephone cable, it was originally called the transmission unit or TU, but was renamed in 1923 or 1924 in honor of the laboratory's found ...
See also:Decibel, Decibel - Definition, Decibel - Standards, Decibel - Merits, Decibel - History of bels and decibels, Decibel - Uses, Decibel - Acoustics, Decibel - Electronics, Decibel - Optics, Decibel - Telecommunications, Decibel - Seismology, Decibel - Typical abbreviations, Decibel - Absolute measurements, Decibel - Relative measurements, Decibel - Reckoning, Decibel - Round numbers, Decibel - The 4 → 6 energy rule, Decibel - The 789 rule, Decibel - −3 dB ≈ ½ power, Decibel - 6 dB per bit, Decibel - Reference Read more here: » Decibel: Encyclopedia II - Decibel - History of bels and decibels |
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| | | | Decibel - History of bels and decibels: Encyclopedia II - Decibel - Uses
Decibel - Acoustics.
The decibel unit is often used in acoustics to quantify sound levels relative to some 0 dB reference. The reference may be defined as a sound pressure level (SPL), commonly 20 micropascals (20 μPa). To avoid confusion with other decibel measures, the term dB(SPL) is used for this. The reference sound pressure (corresponding to a sound pressure level of 0 dB) can also be defined as the sound pressure at the threshold of human hearing, which is conventionally taken to be 2×10−5 newtons per square metre, or 20 micropascals. That is roughly the soun ...
See also:Decibel, Decibel - Definition, Decibel - Standards, Decibel - Merits, Decibel - History of bels and decibels, Decibel - Uses, Decibel - Acoustics, Decibel - Electronics, Decibel - Optics, Decibel - Telecommunications, Decibel - Seismology, Decibel - Typical abbreviations, Decibel - Absolute measurements, Decibel - Relative measurements, Decibel - Reckoning, Decibel - Round numbers, Decibel - The 4 → 6 energy rule, Decibel - The 789 rule, Decibel - −3 dB ≈ ½ power, Decibel - 6 dB per bit, Decibel - dB cheat sheet, Decibel - Reference Read more here: » Decibel: Encyclopedia II - Decibel - Uses |
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| | | | Decibel - History of bels and decibels: Encyclopedia II - Decibel - Uses
Decibel - Acoustics.
The decibel unit is often used in acoustics to quantify sound levels relative to some 0 dB reference. The reference may be defined as a sound pressure level (SPL), commonly 20 micropascals (20 μPa). To avoid confusion with other decibel measures, the term dB(SPL) is used for this. The reference sound pressure (corresponding to a sound pressure level of 0 dB) can also be defined as the sound pressure at the threshold of human hearing, which is conventionally taken to be 2×10−5 newtons per square metre, or 20 micropascals. That is roughly the soun ...
See also:Decibel, Decibel - Definition, Decibel - Standards, Decibel - Merits, Decibel - History of bels and decibels, Decibel - Uses, Decibel - Acoustics, Decibel - Electronics, Decibel - Optics, Decibel - Telecommunications, Decibel - Seismology, Decibel - Typical abbreviations, Decibel - Absolute measurements, Decibel - Relative measurements, Decibel - Reckoning, Decibel - Round numbers, Decibel - The 4 → 6 energy rule, Decibel - The 789 rule, Decibel - −3 dB ≈ ½ power, Decibel - 6 dB per bit, Decibel - Reference Read more here: » Decibel: Encyclopedia II - Decibel - Uses |
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| | | | Decibel - History of bels and decibels: Encyclopedia II - Decibel - Reckoning Decibels are handy for mental calculation, because adding them is easier than multiplying ratios. First, however, one has to be able to convert easily between ratios and decibels. The most obvious way is to memorize the logs of small primes, but there are a few other tricks that can help.
Decibel - Round numbers.
The values of coins and banknotes are round numbers. The rules are:
One is a round number
Twice a round number is a round number: 2, 4, 8, 16, 32, 64
Ten times a rou ...
See also:Decibel, Decibel - Definition, Decibel - Standards, Decibel - Merits, Decibel - History of bels and decibels, Decibel - Uses, Decibel - Acoustics, Decibel - Electronics, Decibel - Optics, Decibel - Telecommunications, Decibel - Seismology, Decibel - Typical abbreviations, Decibel - Absolute measurements, Decibel - Relative measurements, Decibel - Reckoning, Decibel - Round numbers, Decibel - The 4 → 6 energy rule, Decibel - The 789 rule, Decibel - −3 dB ≈ ½ power, Decibel - 6 dB per bit, Decibel - dB cheat sheet, Decibel - Reference Read more here: » Decibel: Encyclopedia II - Decibel - Reckoning |
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| | | | Decibel - History of bels and decibels: Encyclopedia II - Decibel - Typical abbreviations
Decibel - Absolute measurements.
dBm or dBmW
dB(1 mW) — power measurement relative to 1 milliwatt.
dBW
dB(1 W) — same as dBm, with reference level of 1 watt.
dBu or dBv
dB(0.775 V) — (usually RMS) voltage amplitude referenced to 0.775 volt. Although dBu can be used with any impedance, dBu = dBm when the load is 600Ω. dBu is preferable, since dBv is easily confused with dBV. The "u" comes from "unlo ...
See also:Decibel, Decibel - Definition, Decibel - Standards, Decibel - Merits, Decibel - History of bels and decibels, Decibel - Uses, Decibel - Acoustics, Decibel - Electronics, Decibel - Optics, Decibel - Telecommunications, Decibel - Seismology, Decibel - Typical abbreviations, Decibel - Absolute measurements, Decibel - Relative measurements, Decibel - Reckoning, Decibel - Round numbers, Decibel - The 4 → 6 energy rule, Decibel - The 789 rule, Decibel - −3 dB ≈ ½ power, Decibel - 6 dB per bit, Decibel - dB cheat sheet, Decibel - Reference Read more here: » Decibel: Encyclopedia II - Decibel - Typical abbreviations |
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| | | | Decibel - History of bels and decibels: Encyclopedia II - Decibel - Reckoning Decibels are handy for mental calculation, because adding them is easier than multiplying ratios. First, however, one has to be able to convert easily between ratios and decibels. The most obvious way is to memorize the logs of small primes, but there are a few other tricks that can help.
Decibel - Round numbers.
The values of coins and banknotes are round numbers. The rules are:
One is a round number
Twice a round number is a round number: 2, 4, 8, 16, 32, 64
Ten times a rou ...
See also:Decibel, Decibel - Definition, Decibel - Standards, Decibel - Merits, Decibel - History of bels and decibels, Decibel - Uses, Decibel - Acoustics, Decibel - Electronics, Decibel - Optics, Decibel - Telecommunications, Decibel - Seismology, Decibel - Typical abbreviations, Decibel - Absolute measurements, Decibel - Relative measurements, Decibel - Reckoning, Decibel - Round numbers, Decibel - The 4 → 6 energy rule, Decibel - The 789 rule, Decibel - −3 dB ≈ ½ power, Decibel - 6 dB per bit, Decibel - Reference Read more here: » Decibel: Encyclopedia II - Decibel - Reckoning |
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| | | | Decibel - History of bels and decibels: Encyclopedia II - Decibel - Typical abbreviations
Decibel - Absolute measurements.
dBm or dBmW
dB(1 mW) — power measurement relative to 1 milliwatt.
dBW
dB(1 W) — same as dBm, with reference level of 1 watt.
dBu or dBv
dB(0.775 V) — (usually RMS) voltage amplitude referenced to 0.775 volt. Although dBu can be used with any impedance, dBu = dBm when the load is 600Ω. dBu is preferable, since dBv is easily confused with dBV. The "u" comes from "unlo ...
See also:Decibel, Decibel - Definition, Decibel - Standards, Decibel - Merits, Decibel - History of bels and decibels, Decibel - Uses, Decibel - Acoustics, Decibel - Electronics, Decibel - Optics, Decibel - Telecommunications, Decibel - Seismology, Decibel - Typical abbreviations, Decibel - Absolute measurements, Decibel - Relative measurements, Decibel - Reckoning, Decibel - Round numbers, Decibel - The 4 → 6 energy rule, Decibel - The 789 rule, Decibel - −3 dB ≈ ½ power, Decibel - 6 dB per bit, Decibel - Reference Read more here: » Decibel: Encyclopedia II - Decibel - Typical abbreviations |
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| | | | Decibel - History of bels and decibels: Encyclopedia II - Decibel - Definition An intensity I or power P can be expressed in decibels with the standard equation
where I0 and P0 are a specified reference intensity and power.
If PdB is 10 dB greater than PdB0 then P is ten times P0. If PdB is 3 dB greater, the power r ...
See also:Decibel, Decibel - Definition, Decibel - Standards, Decibel - Merits, Decibel - History of bels and decibels, Decibel - Uses, Decibel - Acoustics, Decibel - Electronics, Decibel - Optics, Decibel - Telecommunications, Decibel - Seismology, Decibel - Typical abbreviations, Decibel - Absolute measurements, Decibel - Relative measurements, Decibel - Reckoning, Decibel - Round numbers, Decibel - The 4 → 6 energy rule, Decibel - The 789 rule, Decibel - −3 dB ≈ ½ power, Decibel - 6 dB per bit, Decibel - Reference Read more here: » Decibel: Encyclopedia II - Decibel - Definition |
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| | | | Decibel - History of bels and decibels: Encyclopedia II - Decibel - Definition An intensity I or power P can be expressed in decibels with the standard equation
where I0 and P0 are a specified reference intensity and power.
If PdB is 10 dB greater than PdB0 then P is ten times P0. If PdB is 3 dB greater, the power r ...
See also:Decibel, Decibel - Definition, Decibel - Standards, Decibel - Merits, Decibel - History of bels and decibels, Decibel - Uses, Decibel - Acoustics, Decibel - Electronics, Decibel - Optics, Decibel - Telecommunications, Decibel - Seismology, Decibel - Typical abbreviations, Decibel - Absolute measurements, Decibel - Relative measurements, Decibel - Reckoning, Decibel - Round numbers, Decibel - The 4 → 6 energy rule, Decibel - The 789 rule, Decibel - −3 dB ≈ ½ power, Decibel - 6 dB per bit, Decibel - dB cheat sheet, Decibel - Reference Read more here: » Decibel: Encyclopedia II - Decibel - Definition |
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