dB is the abbreviation of English "decibel", where deci means one-tenth and Bel means "shell".
Decibel, decibel is one-tenth of a decibel. "Bel" is short for "Bell", a unit named after the brilliant scientist Alexander Graham Bell. Bell was granted a patent for the invention of the telephone in 1876, and made a huge breakthrough in the application and development of the telephone.
Bel is not a unit of the International System of Units (SIU), but the rules of the SIU require that the first letter of a unit symbol expressed in a person's name be capitalized, so one sees that the B in dB should be capitalized. Because "Bel" this unit is relatively large, the use of inconvenience, more commonly used is one-tenth of a Bel, that is, decibels.
Today, in the field of audio engineering and acoustics, engineers and sound engineers use the word dB almost every day. For example, "attenuate 1000Hz by 3dB", "push the fader up by 3dB" or "the sensitivity of this speaker is 98dB SPL", it can be said that dB is a ubiquitous unit in the audio industry. dB is a ubiquitous unit in the audio industry.
Introduction of decibel applications:
1. Acoustics: The decibel is used in acoustics to measure and compare the intensity and volume of sound. For example, decibels can be used to measure music volume, environmental noise, industrial noise and so on. Also, decibels can be used to assess auditory perception of sound, such as the degree of hearing loss.
2, communication: decibel is used to measure and compare the intensity of wireless signals, electrical signals, etc.. In wireless communications, decibels can be used to assess signal quality, signal transmission range and so on. In electronic engineering, decibels are also used to measure and compare signal power, gain, etc. in circuits.
3, environmental noise: decibels can be used to measure and assess the level of environmental noise to understand the impact of noise on human health and the environment. This is important for urban planning, transportation planning, industrial environmental monitoring and so on.
4, audio engineering: in audio engineering, decibels are used to measure and adjust the input and output levels of audio equipment. For example, it is used to control the sound level of concerts, concerts, theaters and other places to ensure the proper intensity of audio signals.
5, medical: decibels can be used to measure and assess the sound level of medical equipment, such as the noise level of medical instruments and equipment. At the same time, decibels are also used to assess the potential impact on human health for environmental noise.