| the loss, expressed in decibels, which has to be introduced into a working standard in order to obtain in a given direction the same loudness as the telephone call being considered, the acoustical speech power emitted by the talker being the same in both cases
NOTE 1 – The relative equivalent is positive or negative according to whether it has been necessary for a loss to be added or removed from that standard.
NOTE 2 – The reference equivalent is approximately equal to the sum of the relative equivalent measured with respect to a working standard and of the reference equivalent of this working standard.
NOTE 3 – The relative equivalent is strictly defined by the measuring method described in the CCITT Recommendation P72 from the Volume V of the Red Book, 1985.
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