6.4.4 Desktop hands-free UE receiving
26.1313GPPRelease 18RequirementsTerminal acoustic characteristics for telephonyTS
The receiving sensitivity frequency response from the SS audio input (analogue or digital input of the reference speech encoder of the SS) to the free-field shall be as follows:
The receiving sensitivity frequency response shall be within the mask which can be drawn with straight lines between the breaking points in table 12 on a logarithmic (frequency) – linear (dB sensitivity) scale.
Table 12: Desktop hands-free receiving sensitivity/frequency mask
|
Frequency (Hz) |
Upper limit (dB) |
Lower limit (dB) |
|---|---|---|
|
125 |
8 |
|
|
200 |
8 |
-12 |
|
250 |
8 |
-9 |
|
315 |
7 |
-6 |
|
400 |
6 |
-6 |
|
5 000 |
6 |
-6 |
|
6 300 Hz |
6 |
-9 |
|
8 000 Hz |
6 |
- |
|
NOTE: The limits for intermediate frequencies lie on a straight line drawn between the given values on a linear (dB) – logarithmic (Hz) scale. All sensitivity values are expressed in dB on an arbitrary scale. |
||
Figure 12: Desktop hands-free receiving sensitivity/frequency mask
It is recommended as a performance objective that the receiving sensitivity frequency response be within the mask which can be drawn with straight lines between the breaking points in table 12.a on a logarithmic (frequency) – linear (dB sensitivity) scale.
Table 12a: Performance objective for desktop hands-free receiving sensitivity/frequency response
|
Frequency (Hz) |
Upper limit (dB) |
Lower limit (dB) |
|
100 |
0 |
|
|
200 |
0 |
-18 |
|
250 |
0 |
-15 |
|
315 |
0 |
-12 |
|
6 300 |
0 |
-12 |
|
8 000 |
0 |
Figure 12a: Performance objective for desktop and vehicle-mounted hands-free receiving sensitivity/frequency response
Compliance shall be checked by the relevant test described in TS 26.132.