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TS 26.131 (SA4)
Terminal acoustic characteristics for telephony – Requirements

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(P) V14.1.0    2017/06    77 p.
(P) V13.4.0    2017/06    73 p.
(P) V12.5.0    2016/03    67 p.
(P) V11.3.0    2013/12    41 p.
(P) V10.5.0    2013/12    36 p.
(P) V9.5.0    2013/12    30 p.
(P) V8.3.0    2011/04    29 p.
(P) V7.1.0    2007/12    27 p.
(P) V6.1.0    2007/03    27 p.
(P) V5.2.0    2002/09    27 p.
(P) V4.2.0    2002/09    18 p.
(P) V3.4.0    2002/09    18 p.

Rapporteur:  Mr. Usai, Paolino
See also:  –

This TS is applicable to any terminal capable of supporting narrow-band or wideband telephony, either as a stand-alone service or as the telephony component of a multimedia service. This TS specifies minimum performance requirements for the acoustic characteristics of 3G terminals when used to provide narrow-band or wideband telephony.

The set of minimum performance requirements enables a guaranteed level of speech quality while taking possible physical limits of the terminal design into account. Some performance objectives are also defined, if such design limits can be overcome. Care must be taken in applying performance objectives in isolation, not to degrade overall end-user speech quality.


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1   Scope [R3]   PDF-p. 8
2   References [R3]
3   Definitions, symbols and abbreviations [R3]   PDF-p. 9
4   Interfaces [R3]   PDF-p. 10
5   Narrowband telephony transmission performance [R3]   PDF-p. 11
5.1   Applicability
5.2   Overall loss/loudness ratings
5.3   Idle channel noise (handset and headset UE)
5.4   Sensitivity/frequency characteristics
5.5   Sidetone characteristics (handset and headset UE)   PDF-p. 19
5.6   Stability loss   PDF-p. 20
5.7   Acoustic echo control
5.8   Distortion
5.9   Void
5.10   Information on other parameters (not normative)   PDF-p. 23
5.11   Sending performance in the presence of ambient noise [R11]
5.12   Delay [R11]   PDF-p. 24
5.13   Echo control characteristics [R11]
5.14   Clock accuracy [R14]
5.15   Jitter buffer management behaviour [R14]   PDF-p. 28

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