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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]
A peak meter is a type of measuring instrument that visually indicates the instantaneous level of an audio signal that is passing through it (a sound level meter). In sound reproduction , the meter, whether peak or not, is usually meant to correspond to the perceived loudness of a particular signal.
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Alcohol measurements are units of measurement for determining amounts of beverage alcohol.Alcohol concentration in beverages is commonly expressed as alcohol by volume (ABV), ranging from less than 0.1% in fruit juices to up to 98% in rare cases of spirits.
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A noise dosimeter (American) or noise dosemeter (British) is a specialized sound level meter intended specifically to measure the noise exposure of a person integrated over a period of time; usually to comply with Health and Safety regulations such as the Occupational Safety and Health (OSHA) 29 CFR 1910.95 Occupational Noise Exposure Standard ...
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Decibel measurement is highly dependent on distance from the source of the sound; if this is not given, the sound level reported is of limited use. Also, sound level may be metered on several ways: average, maximum level (with the sound level meter set to Fast, Slow, Impulse, or Peak), etc. In addition, there are several decibel scales.