power level

3.06  power level. Ten times the logarithm to the base ten of the ratio of a given power to the corresponding reference value. The reference value should be indicated. Unit, decibel...

frequency level

3.05  frequency level. Logarithm of the ratio of a given frequency to an appropriate reference value. The base of the logarithm and reference value should be indicated. Annotation 1          If the base of the...

neper

3.04  neper. Logarithmic unit for the amplitude ratio of two sinusoidal acoustic variables of the same kind, or for the ratio of a sinusoidal amplitude to a reference value of the same kind, when the logarithm is on the Napierian (natural) base e ≈...

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