scope:

This Recommendation specifies the use of the head and torso simulator (HATS) for hands-free (including speakerphone, loudspeaking and headset functions) and handset terminal testing. It applies for subjective tests, e.g., as described in [ITU-T P.832] or for objective measurements as described in, for example, [ITU-T P.340]. The test positions, equalizations and calibration are specified. The binaural test conditions are also considered. Test methods for both send and receive characteristics testing are specified.

For the applications described in this Recommendation, the HATS consists of a head mounted on a torso that extends to the waist. The head is equipped with two artificial ears according to [ITU-T P.57] and with a mouth simulator. The HATS is specified physically as well as acoustically, in [ITU-T P.58].