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Decibel with the abbreviation dB is equal to one-tenth of a bel, after Alexander Graham Bell. It is a measuring system first used in telephony in 1929. It is a logarithmic unit of measurement that expresses the magnitude of a physical quantity, usually power or intensity, relative to a specified or implied reference level. Since it expresses a ratio of two quantities with the same unit, it is a dimensionless unit. The inventor of the SPL meter (sound pressure level meter) was not Alexander Graham Bell, but it were the engineers of Bell Telephone Company, New Jersey

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16y ago

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