安裝中文字典英文字典辭典工具!
安裝中文字典英文字典辭典工具!
|
- Decibel - Wikipedia
The decibel (symbol: dB) is a relative unit of measurement equal to one tenth of a bel (B) It expresses the ratio of two values of a power or root-power quantity on a logarithmic scale Two signals whose levels differ by one decibel have a power ratio of 10 1 10 (approximately 1 26) or root-power ratio of 10 1 20 (approximately 1 12) [1] [2]
- Decibel (dB) | Definition, Formula, Facts | Britannica
decibel (dB), unit for expressing the ratio between two physical quantities, usually amounts of acoustic or electric power, or for measuring the relative loudness of sounds One decibel (0 1 bel) equals 10 times the common logarithm of the power ratio
- What Are Decibels, and How Are They Measured? | HowStuffWorks
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 human ear can hear everything from your fingertip brushing lightly over your skin to a loud jet engine
- Levels Of Noise In Decibels (dB) Level Comparison Chart
To express levels of sound meaningfully in numbers that are more manageable, a logarithmic scale is used, rather than a linear one This scale is the decibel scale A noise level chart showing examples of sounds with dB levels ranging from 0 to 180 decibels
- What is a decibel (dB)? - RapidTables. com
Decibel (Symbol: dB) is a logarithmic unit that indicates ratio or gain Decibel is used to indicate the level of acoustic waves and electronic signals The logarithmic scale can describe very big or very small numbers with shorter notation
- What is Decibel? - BYJUS
The decibel (dB) is a unit that expresses the ratio of two values of a physical quantity, often power or intensity One decibel is one-tenth of one bel, a unit named in honour of Alexander Graham Bell
- How To Understand The Unit Of Decibels (Simple explanation)
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
- How to Calculate dB (Decibels) — Explained with Formula - OneSDR
dB (decibel) is a logarithmic unit used to compare two power or voltage levels It’s not an absolute number — it’s a ratio You use it to express how much stronger or weaker one signal is compared to another Here are the two main formulas used to calculate dB, depending on whether you’re comparing power or voltage: You go from 1 mW to 10 mW:
|
|
|