3.9 Distortion (handset and headset MS)
3GPP43.050Release 17Transmission planning aspects of the speech service in the GSM Public Land Mobile Network (PLMN) systemTS
The requirements for sending and receiving distortion shall be as specified in [49] 3GPP TS 26.131.
For a dual mode GSM/3GPP telephone compliance shall be checked according to the procedures described in [50], 3GPP TS 26.132.
For a single mode GSM MS conformance to the requirement on receiving distortion shall be checked according to the procedures described in [51] 3GPP TS 51.010. Conformance to the requirement on sending distortion shall be checked according to either the procedure described in [51] 3GPP TS 51.010 or the procedure described in [50] 3GPP TS 26.132.
3.9.1 Gain variation, sending
The requirement on gain variation, sending is applicable to single mode GSM MS only.
The gain variation relative to the gain for ARL shall remain within the limits given in table 6. For intermediate levels, the same limits for gain variation apply.
Table 6: Variation of gain with input level, sending
|
Sending level dB relative to ARL |
Upper limit (dB) |
Lower limit (dB) |
|
13 |
0,5 |
‑0,5 |
|
0 |
0,5 |
‑0,5 |
|
‑20 |
0,5 |
‑0,5 |
|
‑20 |
0,5 |
‑2 |
|
‑30 |
0,5 |
‑2 |
|
‑30 |
1 |
‑ |
|
‑40 |
1 |
‑ |
|
‑40 |
2 |
‑ |
|
‑45 |
2 |
‑ |
Compliance of the gain variation in the sending direction shall be checked by the test described in annex C, subclause C.5.1.
3.9.2 G ain variation, receiving
The requirement on gain variation, sending is applicable to single mode GSM MS only.
The gain variation relative to the gain at an input level of –10 dBm0, shall be within the limits given in table 8. For intermediate levels, the same limits for gain variation apply. The requirement is valid for sound pressures up to +10 dBPa. For sound pressures exceeding +10 dBPa at the ERP there is no lower limit requirement.
Table 8: Variation of gain with input level, receiving
|
Receiving level at the digital interface (dBm0) |
Upper limit (dB) |
Lower limit (dB) |
|
+3 |
0,5 |
‑0,5 |
|
‑10 |
0,5 |
‑0,5 |
|
‑40 |
0,5 |
‑0,5 |
|
‑40 |
1 |
‑1 |
|
‑50 |
1 |
‑1 |
|
‑50 |
2 |
‑2 |
Compliance of the gain variation in the receiving direction shall be checked by the test described in annex C, subclause C.5.2.