ITU-T P.805-2007(E) Subjective evaluation of conversational quality

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1、InternationalTelecommunicationUnionITU-TP.805TELECOMMUNICATION(04/2007)STANDARDIZATIONSECTOROFITUSERIESP:TELEPHONETRANSMISSIONQUALITY,TELEPHONEINSTALLATIONS,LOCALLINENETWORKSMethodsforobjectiveandsubjectiveassessmentofqualitySubjectiveevaluationofconversationalqu

2、alityITU-TRecommendationP.805ITU-TP-SERIESRECOMMENDATIONSTELEPHONETRANSMISSIONQUALITY,TELEPHONEINSTALLATIONS,LOCALLINENETWORKSVocabularyandeffectsoftransmissionparametersoncustomeropinionoftransmissionqualitySeriesP.10Subscribers'linesandsetsSeriesP.30P.300Transm

3、issionstandardsSeriesP.40ObjectivemeasuringapparatusSeriesP.50P.500Objectiveelectro-acousticalmeasurementsSeriesP.60MeasurementsrelatedtospeechloudnessSeriesP.70MethodsforobjectiveandsubjectiveassessmentofqualitySeriesP.80P.800Audiovisualqualityinmultimediaservic

4、esSeriesP.900TransmissionperformanceandQoSaspectsofIPend-pointsSeriesP.1000Forfurtherdetails,pleaserefertothelistofITU-TRecommendations.ITU-TRecommendationP.805SubjectiveevaluationofconversationalqualitySummaryITU-TRecommendationP.805describesmethodsandprocedures

5、forconductingconversationteststoevaluatecommunicationquality.Themethodologyusesexamplesofscenarios,ratingscalesandanalysisprocedurestoestimatethesubjectivequalityoftelecommunicationservices.Conversationtestsallowthesimulationofmorerealisticsituationsclosetotheact

6、ualserviceconditionsexperiencedbytelephonecustomers.Inaddition,conversationtestsaredesignedtoassesstheeffectsofimpairmentsthatcancausedifficultywhileconversing(suchasdelay,packetloss,echo,interruptions,noise,clipping,etc.),andmaybeusedtostudyoverallsystemeffectso

7、rspecificdegradationsaswell.SourceITU-TRecommendationP.805wasapprovedon22April2007byITU-TStudyGroup12(2005-2008)undertheITU-TRecommendationA.8procedure.ITU-TRec.P.805(04/2007)iFOREWORDTheInternationalTelecommunicationUnion(ITU)istheUnitedNationsspecializedagencyi

8、nthefieldoftelecommunications.TheITUTelecommunicationStandardizationSector(ITU-T)isapermanentorganofITU.ITU-Tisresponsibleforstudyingtechnical,operatingandtari