| logarithmic ratio, expressed in decibels, of the available power of the given source to the power that the device delivers to a load impedance under specified operating conditions|
Note 1 to entry: Transducer attenuation is given by
Pa is the available power
PL is the power that device delivers to a load impedance
Note 2 to entry: This entry was numbered 561-03-20 in IEC 60050-561:1991.