7.4.7 Electrical interface UE sending
26.1313GPPRelease 18RequirementsTerminal acoustic characteristics for telephonyTS
The sensitivity/frequency characteristics shall be as follows:
The sending sensitivity frequency response measured at the electrical reference point shall be within a mask, which can be drawn between the points given in table 30a1.
The masks are drawn with straight lines between the breaking points in the tables on a logarithmic (frequency) – linear (dB sensitivity) scale.
Table 30a1: Handset and headset sending sensitivity/frequency requirement mask
|
Frequency (Hz) |
Upper limit |
Lower limit |
|
100 |
1 |
[-8] |
|
200 |
1 |
-5 |
|
1000 |
1 |
-5 |
|
3000 |
6 |
-3 |
|
5000 |
8 |
-3 |
|
12500 |
8 |
-3 |
|
16000 |
8 |
|
|
NOTE 1: All sensitivity values are expressed in dB on an arbitrary scale. |
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NOTE 2: The limit in bracket in the table is enforced but is under evaluation. |
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Figure 16a: Electrical interface sending sensitivity/frequency masks. The frequency response of the EVS codec operating as specified in TS 26.132 (super-wideband 24,4kbit/s, using the specified P.501 speech test signal), is plotted for reference, normalized to 0dB at 1kHz.
A UE operating in super-wideband mode shall pass the super-wideband requirements (i.e. when measured according to in 1/3rd octaves) as specified in Table 30a1, and shall also pass the wideband sensitivity/frequency characteristics requirements in the wideband range using the wideband measurement (i.e. measured in 1/12th octaves) as specified in Table 14a1.
Compliance shall be checked by the relevant test described in TS 26.132.