| Definition: | the final difference in decibels, when the sound articulation levels have been reduced to 80 %, between the attenuation in the reference system for the determination of AEN and that in a given telephone system, during articulation tests made in a given direction alternately on each system within increasing values of line attenuation
NOTE – The AEN method is described in the CCITT Recommendation P12 from the Volume V of the Yellow Book, 1981.
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