26.1323GPPRelease 18Speech and video telephony terminal acoustic test specificationTS
A suitable position shall be defined for each handset UE and documented in the test report. When using a handset UE, the handset is placed on HATS as described in ITU-T Recommendation P.64 Annex E .
The positioning for such handset UEs is defined in ITU-T Recommendation P.64 Annex D.5 and E.3 .
The criteria for determining the ECRP follows this order:
– At the manufacturer defined position (MECRP), if provided.
– If not, at the centre of the earpiece as defined in Annex E of ITU-T P.64, if the handset features a traditional earpiece.
– If not (handset provides a non-traditional earpiece, e.g., UE with vibrating display designed for sound radiation, with acoustic outlet at the top edge or non-visible outlet):
– A graphical user interface showing the location of optimal sound radiation, if provided.
– If not, through an objective determination procedure of ECRP as described in Annex H, if possible.
– If not, after a subjective determination by the test operator of the optimal holding position.
The position of the handset positioner fork positions and support pins shall also be documented by means of dz/dy coordinates according to the definitions in ITU-T Recommendation P.64 Annex D.5 and E.3 .
The artificial mouth shall conform to ITU-T Recommendation P.58 . The artificial ear shall conform to ITU-T Recommendation P.57 . Type 3.3 ear shall be used and positioned on HATS according to ITU-T Recommendation P.58 .
Position and calibration of HATS
The sending and receiving characteristics shall be tested with the HATS. It shall be indicated what application force was used. If not stated otherwise in TS 26.131, an application force of 8 ± 2 N shall be used.
The horizontal positioning of the HATS reference plane shall be guaranteed within ± 2º.