In cases where the ratio is of a squared quantity, 1 dB equals 20 times the common logarithm of the ratio. dB - The decibel (dB) is the unit used to measure the magnitude or intensity of sound. Decibels are also used more generally to express the logarithmic ratio of two magnitudes of any unit, such as two electric voltages or currents (or analogous acoustic quantities). For example, a 60-dB, or 6-bel, sound, such as normal speech, is six powers of 10 (i.e., 10 6, or 1,000,000) times more intense than a barely detectable sound, such as a faint whisper, of 1 dB. In ordinary usage, specification of the intensity of a sound implies a comparison of the intensity of the sound with that of a sound just perceptible to the human ear. a unit for expressing the ratio of the magnitudes of two electric voltages or currents or analogous acoustic quantities equal to 20 times the common logarithm of the voltage or current ratio. Expressed as a formula, the intensity of a sound in decibels is 10 log 10 ( S 1/ S 2), where S 1 and S 2 are the intensity of the two sounds i.e., doubling the intensity of a sound means an increase of a little more than 3 dB. decibel: noun a unit for expressing the ratio of two amounts of electric or acoustic signal power equal to 10 times the common logarithm of this ratio. One decibel (0.1 bel) equals 10 times the common logarithm of the power ratio. SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!ĭecibel (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.Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.In the following chart, some sounds are expressed both linearly in µPa and logarithmically in dB. You can click on the demo button to learn the formula. Britannica Beyond We’ve created a new place where questions are at the center of learning. Sound pressure level, which is often abbreviated as SPL or Lp, in decibels (dB), can then be obtained using the following formula.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.
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