Content for TS 26.131 Word version: 18.1.0

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6.4 Sensitivity/frequency characteristics 6.4.1 Handset and headset UE sending 6.4.2 Handset and headset UE receiving
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6.4 Sensitivity/frequency characteristics p. 41

In general it is recommended for all configurations to have a flat sending frequency response.

6.4.1 Handset and headset UE sending p. 41

The sensitivity/frequency characteristics shall be as follows:

The sending sensitivity frequency response, measured either from the mouth reference point (MRP) to the digital interface or from the MRP to the SS audio output (digital output of the reference speech decoder of the SS), shall be within a mask, which can be drawn between the points given in Table 9. The mask is drawn with straight lines between the breaking points in Table 1 on a logarithmic (frequency) - linear (dB sensitivity) scale.

Table 9: Handset and headset sending sensitivity/frequency mask

Send sensitivity/frequency response Frequency (Hz)	Upper limit (dB)	Lower limit (dB)
100	0
200	5	-5
5 000	5	-5
6 300	5	-10
8 000	5
NOTE: All sensitivity values are expressed in dB on an arbitrary scale.

Copy of original 3GPP image for 3GPP TS 26.131, Fig. 9: Handset and headset sending sensitivity/frequency mask

Figure 9: Handset and headset sending sensitivity/frequency mask
(⇒ copy of original 3GPP image)

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

6.4.2 Handset and headset UE receiving p. 42

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 10 on a logarithmic (frequency) - linear (dB sensitivity) scale.

Table 10: Handset and headset receiving sensitivity/frequency mask

Frequency (Hz)	Upper limit (dB) 8 ± 2 N	Lower limit (dB) 8 ± 2 N
100	6
200	6	-10
300	6	-6
1 000	6	-6
2 000	8	-6
5 000	8	-6
6 300	8	-12
8 000	8
NOTE: All sensitivity values are expressed in dB on an arbitrary scale.

Copy of original 3GPP image for 3GPP TS 26.131, Fig. 10: Handset and headset receiving sensitivity/frequency mask

Figure 10: Handset and headset receiving sensitivity/frequency mask
(⇒ copy of original 3GPP image)

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