ITU-T G.722 Annex A (03 1993) (英) Testing signal-to-total ……

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1、INTERNATIONALTELECOMMUNICATIONUNION)45 4'!NNEX!TELECOMMUNICATION(03/93)STANDARDIZATIONSECTOROFITU'%.%2!,!30%#43/&$)')4!,42!.3-)33)/.3934%-K(Z!5$)/ #/$).'7)4().KBITS!NNEX!4ESTINGSIGNAL TO TOTALDISTORTIONRATIOFORK(Z

2、AUDIO CODECSATKBITS2ECOMMENDATION'CONNECTEDBACK TO BACK)45 4Recommendation'!NNEX!(Previously“CCITTRecommendation”)FOREWORDTheITUTelecommunicationStandardizationSector(ITU-T)isapermanentorganoftheInternationalTelecom-municationUnion.

3、TheITU-Tisresponsibleforstudyingtechnical,operatingandtariffquestionsandissuingRecommendationsonthemwithaviewtostandardizingtelecommunicationsonaworldwidebasis.TheWorldTelecommunicationStandardizationConference(WTSC),whichmeetseveryfouryears,establishedthetopicsf

4、orstudybytheITU-TStudyGroupswhich,intheirturn,produceRecommendationsonthesetopics.ITU-TRecommendationG.722wasrevisedbytheITU-TStudyGroupXV(1988-1993)andwasapprovedbytheWTSC(Helsinki,March1-12,1993).___________________NOTES1AsaconsequenceofareformprocesswithintheI

5、nternationalTelecommunicationUnion(ITU),theCCITTceasedtoexistasof28February1993.Initsplace,theITUTelecommunicationStandardizationSector(ITU-T)wascreatedasof1March1993.Similarly,inthisreformprocess,theCCIRandtheIFRBhavebeenreplacedbytheRadiocommunicationSector.Ino

6、rdernottodelaypublicationofthisRecommendation,nochangehasbeenmadeinthetexttoreferencescontainingtheacronyms“CCITT,CCIRorIFRB”ortheirassociatedentitiessuchasPlenaryAssembly,Secretariat,etc.FutureeditionsofthisRecommendationwillcontaintheproperterminologyrelatedtot

7、henewITUstructure.2InthisRecommendation,theexpression“Administration”isusedforconcisenesstoindicatebothatelecommunicationadministrationandarecognizedoperatingagency.ãITU1993Allrightsreserved.Nopartofthispublicationmaybereproducedorutilizedinanyformorbyanymeans,el

8、ectronicormechanical,includingphotocopyingandmicrofilm,withoutpermissioninwritingfromtheITU.CONTENTSRecommendationG.722–AnnexA(03/93)PageAnnexA–Testingsignal-t