sound pressure level

3.09  sound pressure level. Ten times the base-ten logarithm of the ratio of a time-mean-square sound-pressure signal, in a stated frequency band, for a stated averaging time duration, to the square of the reference value for sound pressure level....

sound power level

3.07  sound power level. Ten times the logarithm to the base ten of the ratio of a given sound power, in a stated frequency band, to the reference value for sound power.  ...

decibel

3.03 decibel. Unit of the level of a power or power-like quantity when the base of the logarithm is the tenth root of ten. Unit symbol, dB....

bel

3.02 bel. Unit of the level of a power or power-like quantity when the base of the logarithm is ten. Unit symbol, B.

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