Universal Mobile Telecommunications System (UMTS); LTE; Terminal acoustic characteristics for telephony; Requirements (V14.0.0; 3GPP TS 26.131 version 14.0.0 Release 14)
The present document is applicable to any terminal capable of supporting narrowband@ wideband@ super-wideband or fullband telephony@ either as a stand-alone service or as the telephony component of a multimedia service. The present document specifies minimum performance requirements for the acoustic characteristics of 3G and LTE terminals when used to provide narrowband@ wideband@ super-wideband or fullband 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.