ITU-T J.145 (03 2001) (英) Measurement and control

INTERNATIONALTELECOMMUNICATIONUNIONITU-TJ.145TELECOMMUNICATIONSTANDARDIZATIONSECTOROFITU(03/2001)SERIESJ:CABLENETWORKSANDTRANSMISSIONOFTELEVISION,SOUNDPROGRAMMEANDOTHERMULTIMEDIASIGNALSMeasurementofthequalityofserviceMeasurementandcontrolofthequalityofserviceforsoundtransmissionovercontributionanddistributionnetworksITU-TRecommendationJ.145(FormerlyCCITTRecommendation)ITU-TJ-SERIESRECOMMENDATIONSCABLENETWORKSANDTRANSMISSIONOFTELEVISION,SOUNDPROGRAMMEANDOTHERMULTIMEDIASIGNALSGeneralRecommendationsJ.1–J.9Generalspecificationsforanaloguesound-programmetransmissionJ.10–J.19Performancecharacteristicsofanaloguesound-programmecircuitsJ.20–J.29Equipmentandlinesusedforanaloguesound-programmecircuitsJ.30–J.39Digitalencodersforanaloguesound-programmesignalsJ.40–J.49Digitaltransmissionofsound-programmesignalsJ.50–J.59CircuitsforanaloguetelevisiontransmissionJ.60–J.69Analoguetelevisiontransmissionovermetalliclinesandinterconnectionwithradio-relaylinksJ.70–J.79DigitaltransmissionoftelevisionsignalsJ.80–J.89AncillarydigitalservicesfortelevisiontransmissionJ.90–J.99OperationalrequirementsandmethodsfortelevisiontransmissionJ.100–J.109InteractivesystemsfordigitaltelevisiondistributionJ.110–J.129TransportofMPEG-2signalsonpacketisednetworksJ.130–J.139MeasurementofthequalityofserviceJ.140–J.149DigitaltelevisiondistributionthroughlocalsubscribernetworksJ.150–J.159IPCablecomJ.160–J.179MiscellaneousJ.180–J.199ApplicationforInteractiveDigitalTelevisionJ.200–J.209Forfurtherdetails,pleaserefertothelistofITU-TRecommendations.ITU-TJ.145(03/2001)iITU-TRecommendationJ.145MeasurementandcontrolofthequalityofserviceforsoundtransmissionovercontributionanddistributionnetworksSummaryThisRecommendationspecifiestheparametersandthemethodsforthemeasurementandcontroloftheQoSfordigitalsoundtransmissiononcontributionanddistributionnetworks.SourceITU-TRecommendationJ.145waspreparedbyITU-TStudyGroup9(2001-2004)andapprovedundertheWTSAResolution1procedureon9March2001.iiITU-TJ.145(03/2001)FOREWORDTheInternationalTelecommunicationUnion(ITU)istheUnitedNationsspecializedagencyinthefieldoftelecommunications.TheITUTelecommunicationStandardizationSector(ITU-T)isapermanentorganofITU.ITU-Tisresponsibleforstudyingtechnical,operatingandtariffquestionsandissuingRecommendationsonthemwithaviewtostandardizingtelecommunicationsonaworldwidebasis.TheWorldTelecommunicationStandardizationAssembly(WTSA),whichmeetseveryfouryears,establishesthetopicsforstudybytheITU-Tstudygroupswhich,inturn,produceRecommendationsonthesetopics.TheapprovalofITU-TRecommendationsiscoveredbytheprocedurelaiddowninWTSAResolution1.InsomeareasofinformationtechnologywhichfallwithinITU-T'spurview,thenecessarystandardsarepreparedonacollaborativebasiswithISOandIEC.NOTEInthisRecommendation,theexpressionAdministrationisusedforconcisenesstoindicatebothatelecommunicationadministrationandarecognizedoperatingagency.INTELLECTUALPROPERTYRIGHTSITUdrawsattentiontothepossibilitythatthepracticeorimplementationofthisRecommendationmayinvolvetheuseofaclaimedIntellectualPropertyRight.ITUtakesnopositionconcerningtheevidence,validityorapplicabilityofclaimedIntellectualPropertyRights,whetherassertedbyITUmembersorothersoutsideoftheRecommendationdevelopmentprocess.AsofthedateofapprovalofthisRecommendation,ITUhadnotreceivednoticeofintellectualproperty,protectedbypatents,whichmayberequiredtoimplementthisRecommendation.However,implementorsarecautionedthatthismaynotrepresentthelatestinformationandarethereforestronglyurgedtoconsulttheTSBpatentdatabase.ITU2001Allrightsreserved.Nopartofthispublicationmaybereproducedorutilizedinanyformorbyanymeans,electronicormechanical,includingphotocopyingandmicrofilm,withoutpermissioninwritingfromITU.ITU-TJ.145(03/2001)iiiCONTENTSPage1Scope...........................................................................................................................12References...................................................................................................................13Termsanddefinitions.................................................................................................24Abbreviations..............................................................................................................25QualityofService(QoS):Parameters,measurementandcontrol..............................35.1Subjectiveassessmentofaudioquality......................................................................35.2Objectivemeasurementofaudioquality....................................................................35.3Networkrelatedaudioqualityparameters..................................................................45.4Generalnetworkparameters.......................................................................................4ivITU-TJ.145(03/2001)IntroductionDigitalaudiotransmissionwithorwithoutcompressionrequiresnewmethodsformeasurementandcontroloftheoverallQualityofService(QoS).Thesemethodsaredividedintofourparts:–subjectiveassessmentofaudioquality;–objectivemeasurementofaudioquality;–n