The bel was named in honor of alexander graham bell, but the bel is seldom used. Definition of decibel noun in oxford advanced learner's dictionary A decibel (db) is a unit for expressing the ratio between two amounts of electric or acoustic power or for measuring the relative loudness of sounds.
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Remember that decibels measure a ratio
0 db occurs when you take the log of a ratio of 1 (log 1 = 0)
So 0 db does not mean no sound, it means a sound level where the sound pressure is equal to that of the reference level. The decibel (db) is a unit that expresses the ratio of two values of a physical quantity, often power or intensity Decibels (abbreviated db) are the units used to measure the relative intensity of a sound The decibel unit of measurement is a little odd because the human ear is incredibly sensitive.
The unit for measuring the relative intensities of sound is called a decibel Because the decibel scale is logarithmic, a sound with an intensity that is twice that of a reference sound corresponds to an increase of little more than 3 decibels. A decibel (db) is a unit used to measure the intensity or power level of sound or signal It represents the logarithmic ratio between the measured value and a reference value, typically the threshold of human hearing.
A unit used to express the intensity of a sound wave, equal to 20 times the common logarithm of the ratio of the pressure produced by the sound wave to a reference pressure, usually 0.0002 microbar.
See examples of decibel used in a sentence.
