ETSI - TS 103 801
Speech and multimedia Transmission Quality (STQ); Subjective test methodologies for the evaluation of echo control systems
|Publication Date:||1 November 2020|
The present document provides a framework for auditory testing of echo artefacts and double talk impairments that may occur in telecommunication devices of all kind.
The present document assesses degradations in end-to-end scenarios as perceived by the listener at the reference-side. Only degradations caused by the terminal located at the device-side are taken into account by the framework. Since the network delay between reference-side and device-side (and vice-versa) also has an impact on the DUT's signal processing and/or the listener's quality of experience, this parameter is included in the present document as well - any other degradations (e.g. packet-loss in one of the two directions) are out of scope.
Only DCR scales are supported in the auditory test, in particular for echo artefacts and double talk disturbances, which have the most impact on conversations (more may be added in the future). ACR scales e.g. speech distortion or overall quality are not considered for auditory testing.
Any instrumental model predicting results according to the introduced listening test design is out of scope.