ITU P.840:2003
ITU P.840:2003 Subjective Listening Test Method For Evaluating Circuit Multiplication Equipment Describes a subjective listening test method which can be used to evaluate the speech quality of Circuit Multiplication Equipment (CME).
Table of Contents
1Scope1.1Purpose
1.2Testphilosophy
2References
3Definitions
4Abbreviations
5Sourcerecordings
5.1Apparatusandenvironment
5.2Speechmaterial
5.3Procedure
5.4Calibrationsignalsandspeechlevels
6Simulatingsystemload
6.1Requirementsforagenericvoiceloadsimulator
6.2Determiningloadcapacityoftestedsystems
6.3Controllingloadappliedtotestedsystems
7Processingofthespeech
8Testdesign
8.1TestNo.1-Effectofappliedload
8.2TestNo.2-EffectofdigitalerrorsintheDCME
controlchannel
9Listeningtestprocedure
10Analysisofresults
AnnexA-Descriptionofcircuitmultiplicationequipment
A.1Definitions
A.2DigitalSpeechInterpolation(DSI)
A.3Speechdetection
A.4CMEload
A.5Overloadstrategies
A.6Silencereconstructionmethods
A.7Circuitversuspacketmode
A.8Packetreconstruction
AnnexB-Speechmaterialusedtoconstructspeechsequences
AnnexC-Instructionsontheuseofalimitednumberof
sentences
AppendixI-Guidanceforconversationtests