Summary

Recommendation ITU-T P.58 specifies the electroacoustic characteristics of head and torso simulators (HATS) to be used for telephonometric measurements. Both the sound generation and sound pick‑up characteristics of these devices are specified.

This revision of Recommendation ITU-T P.58 concerns new distortion and output linearity requirements for the artificial mouth of the HATS (as for Recommendation ITU-T P.51) and describes the positioning on the HATS of the revised Type 3.2 and new Type 3.4 artificial ears.