![]() In acoustics, the decibel is used as an absolute indicator of sound power per unit area. The main effect of this adjustment is that low and very high frequencies are given less weight than on the standard decibel scale.Ĭompared with dB, A-weighted measurements underestimate the perceived loudness, annoyance factor, and stress-inducing capability of noises with low frequency components, especially at moderate and high volumes of noise. In electronics and communications, the decibel (abbreviated as dB, and also as db and DB) is a logarithmic expression of the ratio between two signal power, voltage, or current levels. Measurements in dBA, or dB(A) as it is sometimes written, are decibel scale readings that have been adjusted in an attempt to take into account the varying sensitivity of the human ear to different frequencies of sound. The abbreviation for a deciBel is dB - the capital B is used to denote. You will often see noise levels given in dBA (A-weighted sound levels) instead of dB. The deciBel, dB or deci-Bel is actually a tenth of a Bel - a unit that is seldom used. For this reason, sound levels in the low frequency end of the spectrum are reduced as the human ear is less sensitive at low audio frequencies than at high audio frequencies. Other Resources: We have 70 other meanings of dBr in our Acronym Attic. This definition appears very frequently and is found in the following Acronym Finder categories: Information technology (IT) and computers. Although dB is commonly used when referring to measuring sound, humans do not hear all frequencies equally. dBr stands for Decibel (reference value) Suggest new definition. However, the B and C weights are only valid for pure signals (signals with a single frequency).Ī dBA is a weighted scale for judging loudness that corresponds to the hearing threshold of the human ear. The blue curve shows the gain for a type A weighting. The reference quantity remains the same 20 µPa and the units are still dB SPL, but each value has a different gain depending on the frequency in order to better represent human auditory perception. Indeed, the ear of a healthy person is more sensitive to frequencies between 2 and 5 kHz. For example, in electronics decibels are used to describe the gain of amplifiers or attenuation of a signal in cables. However, the human ear does not perceive all frequencies in the same way. dB (decibel) a dimensionless logarithmic unit, which is used to express ratios of two arbitrary values of the same physical quantity. But what an inconsistent mess this is Followers of the CamelCase school of thought obviously have difficulty deciding how to handle abbreviations. Thus, the reference quantity is the smallest pressure change detectable by the ear (hearing threshold), 20 µPa in air, which corresponds to 0 dB SPL. In acoustics, sound is a change in pressure relative to atmospheric pressure. For example, dBm means that the reference variable is the milliwatt dBV, the volt. In many cases, dBs are followed by a suffix to define a reference variable. Moreover, dB allows a realistic modelling of human auditory perception, since the ear reacts to relative changes in noise level. First of all, a dB (decibel) is a ratio between two quantities that has been reported on a logarithmic scale.
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