ITU-T P.57 2011 Edition, December 1, 2011
Published By:International Telecommunications Union -Telecommunication Standardization Sector (ITU-T)
This Recommendation specifies the artificial ears for telephonometric use. Three types are recommended, covering the different transducers, types, sizes and technologies.
The methods of use of the artificial ears are outside the scope of this Recommendation; however, some general rules are provided about the application force and the positioning of transducers.