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Above all, it is convenient to add dB values instead of multiplying linear values, as the logarithmic target allows. The logarithmic target Bel is convenient for reducing the span width of the numerical values and the number of digits for the measured values specified. The decibel (dB) scale is logarithmic, meaning that an increase of roughly 3 dB is equivalent to doubling the pressure, expressed in Pascals. Initially, the device Bel was introduced to obtain a logarithmic target of electrical energy or power levels in the telephone technology. The dB is ten times greater than the Bel number.ĭecibel is a convenience measurement unit It is practical but not necessary. The relationship can be described as W2 / W1, where the value of W2 is the actual measurement value that interests us and W1 serves as a fixed reference. The resulting sound pressure level in octave 1, 2, 6, 7 and 8 is low compared with octave band (4,5 og 3) and can be neglected. The unit of measurement Bel describes the (base 10) logarithmic value of a ratio between two sizes of the same dimension. Now add the decibel level from the next device in field number two and press "calculator" to find the decibel level of all devices.ĭecibel is a dimensionless unit of measure and is indicated as dB. The Decibel Calculator shows the addition and subtraction of dB values in the usual acoustic range of 0 to 200 dB. I0: The reference sound intensity, typically the threshold of hearing. I: The sound intensity you want to measure. The formula for calculating the decibel is as follows: Decibel (dB)10log10(I0I) Where: Decibel (dB): The unit for expressing sound intensity. Info: The result 0 dB was calculated from 50 dB and 60.4 dB, which was copied to the first field. The decibel (dB) is a logarithmic unit used to express the ratio of two intensities.