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Level is the logarithmic ratio of two power or two field quantities, provided the denominator is a fixed value of a reference quantity of the same dimension as the numerator [8]. Decibel (dB) is again used as the unit. The value of the reference quantity should always be specified when giving numerical values of levels. According to IEC 27-3 [9] the reference quantity in parentheses can follow the dB symbol to obtain an abbreviated form. If the numerical value of the reference quantity equals ...
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