ITU P.831:1998
ITU P.831:1998 Subjective Performance Evaluation Of Network Echo Cancellers Covers procedures for conducting subjective performance evaluations of network echo cancellers.
Table of Contents
1General1.1Scope
1.2References
1.3Termsanddefinitions
1.4Abbreviations
1.5Conventions
2Overviewofsubjectivetestingproceduresfor
EchoCancellers
2.1Conversationaltest
2.2Talking-and-listeningtest
2.3Third-Partylisteningtests
3Generalconsiderationsforsubjectiveevaluationof
echocancellers
3.1Echocancellerparameterstoevaluate
3.2Testequipmentandcalibration
3.3Selectionofsubjects
3.4Analysisofresults
4Conversationtests
4.1Purpose
4.1.1Advantages
4.1.2Disadvantages
4.2Testdesign,set-upandprocedure
4.2.1Testdesignandcircuitconditions
4.2.2Referenceconditions
4.2.3Task
4.2.4Opinionscalesandquestionnaires
5Talking-and-listeningtest
5.1Purpose
5.2Parameters
5.3Set-up
5.4Descriptionoftestprocedure
5.4.1Initialconvergence
5.4.2Steadystateconditions
5.5Advantages
5.6Disadvantages
5.7Referenceconditions
5.8Precautions
6Third-partylisteningTestA
6.1Purpose
6.2Parameters
6.3Set-up
6.4Recordingprocedurefororiginalsourcematerial
6.5Recordingprocedureforlisteningtestmaterial
6.6Descriptionofthelisteningtestprocedure
6.6.1Playback
6.6.2Subjects
6.7Advantages
6.8Disadvantages
6.9Referenceconditions
6.10Precautions
7Third-partylisteningTestB
7.1Purpose
7.2Impairmentstoevaluate
7.3Set-up
7.4Advantages
7.5Disadvantages
7.6Referenceconditions
7.7Precautions
7.8Descriptionoftestprocedure
7.8.1Recording
7.9Evaluation
7.9.1Playback
7.9.2Subjects
AnnexA-Questionnairesforuseinconversationaltests
A.1Introduction
A.2Samplequestions
AppendixI-Exampletestconditionsforechocanceller
evaluations