5.4.2 Handset and headset UE receiving

26.1313GPPRelease 18RequirementsTerminal acoustic characteristics for telephonyTS

The sensitivity/frequency characteristics shall be as follows:

The receiving sensitivity frequency response, measured either from the digital interface to the DRP with diffuse-field correction or from the SS audio input (analogue or digital input of the reference speech encoder of the SS) to the DRP with diffuse-field correction shall be within a mask, which can be drawn with straight lines between the breaking points in table 2 on a logarithmic (frequency) – linear (dB sensitivity) scale.

Table 2: Handset and headset receiving sensitivity/frequency mask for 8N application force

Frequency (Hz)	Upper limit (dB) 8 ± 2 N	Lower limit (dB) 8 ± 2 N
100	6
300	6	-6
3 400	6	-6
4 000	6
NOTE 1: All sensitivity values are expressed in dB on an arbitrary scale NOTE 2: The basis for the target frequency responses in send and receive is the orthotelephonic reference response measured between 2 subjects 1 m apart under free-field conditions and assumes an ideal receive characteristic. Under these conditions the overall frequency response shows a rising slope. The present document no longer uses the ERP as the reference point for receive but the diffuse-field. With the concept of diffuse-field based receive measurements a rising slope for the overall frequency response is achieved by a flat target frequency response in send and a flat diffuse-field based receive frequency response.

Figure 2: Handset and headset receiving sensitivity/frequency mask for 8N application force

Compliance shall be checked by the relevant test described in TS 26.132.