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]

2025年3月21日 · 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.

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.

2021年10月5日 · To help measure the different levels of sound and deem which ones are safe and harmful, experts use a nonlinear scale to describe the intensity of sound waves conveniently. This scale is known as the decibel scale and uses units called decibels (dB). Simply put, the greater the decibel level, the louder the sound. Source: Echo Barrier.

The decibel scale is a logarithmic scale used to quantify the intensity of a sound or the power level of an electrical signal by comparing it to a given level on a logarithmic scale. This scale is a convenient tool because it can represent very large or small values in a manageable format.

2023年9月7日 · A decibel is a measure of sound intensity and amplitude using the decibel (dB) scale. The amplitude of a sound depends on its loudness.

2024年11月6日 · A decibel (dB) is a unit of measurement for sound levels, also known as amplitude or volume. It is measured on a logarithmic scale, increasing exponentially. Every increase of 10 dB on the decibel scale is equal to a 10-fold increase in sound pressure level.

Decibel is the unit of sound. Its symbol is ‘dB’. We can define decibel as. A unit of measurement used to express the ratio of one value of a power or field quantity to another on a logarithmic scale, the logarithmic quantity being called the power level or field level, respectively.

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.

5 天之前 · What is the dB Scale? The dB scale is used to show the ratio of two different levels of intensity, such as the sound wave power, as opposed to a reference power. Here is the formula used to calculate this ratio: 10 log (P2 / P1) dB. To understand how to calculate dB, let’s take a simple example into consideration.