![]() Loudness is a measure of sound intensity taking frequency into account, and is called a A-weighted decibel, dB(A), or a phon. Take the sound scale shown in pressure in Figure 1: Figure 1: Pressure scale of sound has a wide range of numbers ranging from many zeros after the decimal place to whole numbers. Sound pressures converted to the decibel scale are called sound pressure levels, abbreviated Lp. It divides all other sound pressures by this amount when calculating the decibel value. 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. The decibel scale for sound pressures uses as the reference pressure the lowest noise that the healthy young person can hear (0.00002 Pa). By using decibels, it can be easier to compare different values. 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. If youre in a hurry: Here is what this article will show you about decibels: A decibel classifies the sound pressure level of a sound source in everyday life. This is a standard threshold, but it also depends on frequency. The decibel is not a traditional unit of measure - it is a logarithmic ratio between two numbers. Another more common way to express sound intensity is the decibel scale. Sounds below 10 dB are difficult for some and impossible for others to hear, while anything over 110 dB is uncomfortably loud for nearly anyone. It is equivalent to the average power per unit area. Because decibels increase exponentially, we only need a scale of less than 200 dB to describe any sound you can think of. The intensity of a sound wave is measured as the rate at which it transports energy per unit area. Many regulatory noise limits are specified in terms of A-weighted decibels, or dBA, which is adjusted so that low and very high frequencies of sound are given less weight - as perceived by human ears. This scale is referred to as the decibel scale. The logarithmic decibel scale measures sound base on human hearing. Seven drawn pages constitute a visual support to explain the origin and history of the decibel, together with examples from acoustics and other domains on the use of logarithmic scales and classical decibel calculations. For those looking to gain a deeper understanding of how audio works, whether to make better-informed decisions or simply for the sake of curiosity, its useful to lay down some ground rules that govern how audio systems behave relating to loudness and the decibel. ![]() \)s o is the reference pressure which is 20 micropascals or 0 dB, and s is the observed sound pressure.The human ear has a standard sound threshold of 120 dB, which expressed logarithmically is around 10 12. The decibel (dB) is the unit used to measure the intensity of a sound. The Decibel (dB) Scale & Audio Rules 101.
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