Specifying_Jitter_Performance

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1、AudioEngineeringSocietyConventionPaperPresentedatthe117thConvention2004October28–31SanFrancisco,CA,USASpecifyingtheJitterPerformanceofAudioComponents12ChrisTravisandPaulLesso1SonopsisLtd,Wotton-under-Edge,Gloucestershire,UK

2、K>2WolfsonMicroelectronicsplc,Edinburgh,UKABSTRACTThequestionofsample-clockqualityisaperennialonefordigitalaudioequipmentdesigners.Yetmostchipmakersprovideverylittleinformationaboutthejitterperformanceoftheirproducts.Conse

3、quently,equipmentdesignerssometimesgetburntbyjitterissues.Theincreasinguseofpacket-basedcommunicationsandclass-Damplificationwillthrowthesemattersintosharprelief.Thispaperreviewsvariouswaysofcharacterizingandquantifyingjitter,andrefinesseveralofthemfo

4、raudiopurposes.Italsoattemptstopresentacommon,unambiguousterminology.Thefocusincludeswidebandjitter,basebandjitter,jitterspectra,periodjitter,long-termjitterandjittersignatures.Commentsaremadeonjittertransferthroughphase-lockedloopsandonthejittersusce

5、ptibilityofaudioconverters.1INTRODUCTIONDetailscanbefoundat.Clockstickattheheartofeverydigitalaudioproduct.TheauthorsalsoinvitefeedbackonthepresentpaperJitteronclocksthatareappliedtoaudioconvertersbydirectemail.(analog-to-digita

6、landdigital-to-analog)candegradeaudioperformance.Tomakesenseofthissituation,2OVERVIEWdesignersneedaframeworkforthinkingaboutjitter.Tomakeprogress,theindustryneedssomegoodwaysTheemphasisinthispaperisonaudiosampleclocksofcharacterizingandquantifyingjitt

7、erperformance.andontheclockingchainsfromwhichtheyarederived.Italsoneedsacommonterminology.ThispaperaimsItisnotoninterface-specificaspectsofjitter.tocontributeinalloftheseareas.WehavechosentofocusatthisstageoncomponentsAtthetimeofwriting,anewprojecthas

8、beenproposed(e.g.chips)ratherthanequipment(e.g.mixingdesks).totheAESStandardsCommitteewiththeshorttitleProgresswiththeformerwillhopefullyspawnprogress'JitterPerformanceSpecification'.Itislikelytobewiththelatterinduecourse.allocatedtoAESSC-02-0