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The Bel is far too large for most use, so deciBels have wider application. The upper case has now been dropped except in the abbreviated form. Normally the decibel or dB should always be followed with the reference that the ZERO represents for the simple reason that the reference is variable. It should have been written 0dB wrt 1mW in 600 ohms for the situation it possibly describes. (wrt means, with reference to.)
The normal form is 0dBm or 0dBA or even 0dBV etc, notice how the uppercase returns. The decibel scale is a log scale allowing very wide dynamic changes to be represented, both graphically and intellectually. In the short form, such as 0dBm, the "m" has become an identification for " --wrt-- 1mw in 600 ohms." Similarly with dBV where the reference is one volt. There is a 3dB difference between POWER and VOLTAGE figures so where 6dB represents a change of two in voltage, in power the same doubling, (or halving) is 3dB.
0 dBA represents the threshold of human hearing, often described as a cricket shuffling it's feet in the grass at your feet. This would mean that normal speaking level is about +65 dBA and a jet engine say, +125 dBA. Double or half the power would be a change of 3dB.
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What type of scale is the decibel scale?
The decibel scale is a logarithmic scale. Scroll down to related links and look at "Decibel - Wikipedia" and "Sound level meter - Wikipedia".
You multiply or dividing the decibels by the decibels?
There is no point in doing either one of these. A decibel, being the log of a ratio, is added to or subtracted from another decibel.
What instrument measures the volume of sound?
a decibel meter.
What is the decibel a unit of?
Decibel is no real unit, it is a pseudo unit. The decibel (dB) is a logarithmic unit that indicates the ratio of a physical quantity. A change in voltage ratio by a factor of two is approximately a 6 dB change. A change in power ratio by a factor of two is approximately a 3dB change.
What is the recommended decibel level for the human ear?
60 i think
After whom was the unit of measurement decibel named?
The Decibel was named after Alexander Graham Bell who is the inventor of the telephone and the bell is a sound known as the Decibel. The Decibel ranges from 0 to 140, with 140 being the highest.
What does dB in noise?
dB mean Decibel.
What does the term decibel mean?
Decibel is a measure of sound and is logarithmic, meaning 50 decibels is twice as loud as 40 decibels.
What is dB mean in signal amplifier?
dB is the abbreviation of Decibel
What are the uses of DECIBEL?
What are the uses of DECIBEL?
How do you use the word decibel in a sentence?
How do you use the word decibel in a sentence?What is decibel used for?
How is the decibel abbreviated?
The abbreviation for decibel is dB.
What is the subunit of Decibel?
The bell is a large unit, so a subunit, a decibel, is usually used. There is no subunit of decibel.
What is a decibel in terms of sound?
A decibel is a measure for sound.
What is the Welsh for 'decibel'?
The Welsh word for 'decibel' is desibel.
What is another word for decibel?
another name for decibel
What is the decibel rating of the least sound you can hear?
0 dB is the hearing threshold = 0,0002 microbar
