"deci-" refers to one tenth, and the unit is "bel", generally only decibels are used. Decibel is named after American inventor Alexander Graham Bell.
Decibel is a commonly used unit of measurement. Can be expressed as:
1, which represents the unit of the ratio of power quantity, and is equal to 10 multiplied by the common logarithm of the ratio of power intensity.
2. The unit for expressing the ratio of field quantity is equal to 20 times the common logarithm of the ratio of field strength to amplitude.
3. The unit of sound pressure level is approximately equal to the minimum division value of loudness difference that human ears can usually perceive.
Decibel originated from the measurement of long-distance telecommunications, and was widely used in the fields of electrician, radio, mechanics, shock vibration, mechanical power, acoustics and so on.
The above contents refer to Baidu Encyclopedia-decibel