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Content for  TS 26.131  Word version:  18.1.0

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5.8 Distortion  5.8.1 Sending distortion (excluding electrical interface UE)  5.8.2 Receiving (excluding electrical interface UE)  5.8.3 Sending distortion (electrical interface UE)  5.8.4 Receiving distortion (electrical interface UE)  5.10 Information on other parameters (not normative)  5.11 Sending performance in the presence of ambient noise  5.11.1 General  5.11.2 Connections with handset UE  5.11.3 Connections with Handheld hands-free UE  5.11.4 Connections with electrical interface UE 
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5.8  Distortion  p. 26

5.8.1  Sending distortion (excluding electrical interface UE)  p. 26

The sending part shall meet the following distortion requirements:
Distortion shall be measured between the MRP and the SS audio output (output of the reference speech decoder of the SS). The ratio of signal-to-total distortion power measured with the proper noise weighting (see Table 4 of ITU-T Recommendation G.223 [12]) shall be above the limits given in Table 7.
Sending level
(dBPa at the MRP)		 Sending Ratio (dB)
530
035
-4,735
-1033
-1530
-2027
Limits for intermediate levels are found by drawing straight lines between the breaking points in Table 7 on a linear (dB signal level) - linear (dB ratio) scale.
Compliance of the sending distortion shall be checked by the test described in TS 26.132.
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5.8.2  Receiving (excluding electrical interface UE)  p. 27

The receiving part between the SS audio input (input of the reference speech encoder of the SS) and the applicable acoustic measurement point (DRP with diffuse-field correction for handset and headset modes; free field correction for hands-free modes) shall meet the requirements in this clause at the nominal setting of the volume control:
The ratio of signal to total distortion power measured with the proper noise weighting (see Table 4 of ITU-T Recommendation G.223 [12]) shall be above the limits given in Table 8 when the sound pressure at the applicable acoustic measurement point is up to 10 dBPa. For a sound pressure ≥ 10 dBPa at the applicable acoustic measurement point there is no distortion requirement.
Frequency (Hz) Receiving level at the digital interface (dBm0) Receiving ratio at nominal volume setting (dB) Receiving ratio at maximum volume setting (dB)
315-1620
408-1628
510-1628
816-1628
1 020025,5
-331,2
-1033,5
-1633,5
-2033
-3030,5
-40 (*)22,5 (*)
-45 (*)17,5 (*)
NOTE:
(*) For levels -40 and -45 dBm0 a lower signal-to-total distortion ratio may not be possible, and hence would not be regarded as a failing result. However, the obtained results would be reported.
Limits for intermediate levels are found by drawing straight lines between the breaking points in the Table on a linear (dB signal level) - linear (dB ratio) scale.
Compliance of the receiving distortion shall be checked by the appropriate test method in TS 26.132.
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5.8.3  Sending distortion (electrical interface UE) |R17|  p. 27

The sending part shall meet the following distortion requirements:
Distortion shall be measured at the output of the electrical reference interface. The ratio of signal-to-total distortion power measured with the proper noise weighting (see Table 4 of ITU-T Recommendation G.223 [12]) shall be above the limits given in Table 8a1 for electrical interface UE with analogue connection and Table 8a2 for electrical interface UE with digital connection.
Sending level
(dBV at at the output of the electrical reference interface)		 Sending Ratio (dB)
-5030
-5535
-6035
-6533
-7030
-7527
Sending level
(dBm0 at at the output of the electrical reference interface)		 Sending Ratio (dB)
-630
-1135
-1635
-2133
-2630
-3127
Limits for intermediate levels are found by drawing straight lines between the breaking points in Table 8a1 and Table 8a2 on a linear (dB signal level) - linear (dB ratio) scale.
Compliance of the sending distortion shall be checked by the test described in TS 26.132.
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5.8.4  Receiving distortion (electrical interface UE) |R17|  p. 28

The receiving part between the SS audio input (input of the reference speech encoder of the SS) and applicable electric measurement point (input to the electrical reference interface) shall meet the requirements in this clause at the nominal setting of the volume control:
The ratio of signal to total distortion power measured with the proper noise weighting (see Table 4 of ITU-T Recommendation G.223 [12]) shall be above the limits given in Table 8b.
Frequency (Hz) Receiving level at the digital interface (dBm0) Receiving ratio at nominal volume setting (dB) Receiving ratio at maximum volume setting (dB)
315-1620
408-1628
510-1628
816-1628
1 020025,5
-331,2
-1033,5
-1633,5
-2033
-3030,5
-40 (*)22,5 (*)
-45 (*)17,5 (*)
NOTE:
(*) For levels -40 and -45 dBm0 a lower signal-to-total distortion ratio may not be possible, and hence would not be regarded as a failing result. However, the obtained results would be reported.
Limits for intermediate levels are found by drawing straight lines between the breaking points in the Table 8b on a linear (dB signal level) - linear (dB ratio) scale.
Compliance of the receiving distortion shall be checked by the appropriate test method in TS 26.132.
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5.9  Void

5.10  Information on other parameters (not normative)  p. 29

Information about additional parameters relevant to speech quality, e.g., for terminals where signal processing is used, can be found in ITU-T Recommendations P.340, P.501 and P.502.

5.11  Sending performance in the presence of ambient noise |R11|  p. 29

5.11.1  General  p. 29

For sending, in handset mode, the UE shall reduce the ambient noise picked up by the microphone(s) without significantly degrading the quality of the speech signal.

5.11.2  Connections with handset UE  p. 29

The UE shall comply with the following requirements:
S-MOS-LQOn
  • The average of S-MOS-LQOn scores across all test conditions shall be ≥ 3.0
  • As a performance objective, the average of the S-MOS-LQOn scores across all test conditions should be ≥ 3.5
N-MOS-LQOn
  • The average of the N-MOS-LQOn scores across all test conditions shall be ≥ 2.3
  • As a performance objective, the average of N-MOS-LQOn scores across all test conditions should be ≥ 3.0
G-MOS-LQOn
  • No requirement.
Compliance shall be checked by the relevant tests described in TS 26.132.
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5.11.3  Connections with Handheld hands-free UE |R13|  p. 30

It is recommended that the UE meets the following performance objectives:
S-MOS-LQOn
  • The average of S-MOS-LQOn scores across all five test conditions should be ≥ 3.3
N-MOS-LQOn
  • The average of N-MOS-LQOn scores across all test conditions should be ≥ 2.2
G-MOS-LQOn
  • No performance objective.
Compliance shall be checked by the relevant tests described in TS 26.132.

5.11.4  Connections with electrical interface UE |R17|  p. 30

The UE shall comply with the following requirements:
S-MOS-LQOn
  • The average of S-MOS-LQOn scores across all test conditions shall be ≥ 3.0
  • As a performance objective, the average of the S-MOS-LQOn scores across all test conditions should be ≥ 3.5
N-MOS-LQOn
  • The average of the N-MOS-LQOn scores across all test conditions shall be ≥ 2.3
  • As a performance objective, the average of N-MOS-LQOn scores across all test conditions should be ≥ 3.0
G-MOS-LQOn
  • No performance objective.
Compliance shall be checked by the relevant tests described in TS 26.132.
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