Dolby Laboratories DP570 D.7 Extended Bitstream Information Parameters

A Guide to Dolby Metadata Extended Bitstream Information Parameters

Dolby® DP570 Multichannel Audio Tool User’s Manual 101

Digitalprogramisdecodedto5.1channels,butitprovidesanLt/Rtoutputthatcanbe

decodedwithProLogictoL,C,R,S,ifdesired.

Otherwise,werecommendthatyouleavethisparameterenabledfornormalprogram

materialtoavoidproblemswithproblemswiththeanalogoutputsofset‐topboxes.

D.7 Extended Bitstream Information Parameters

Inresponsetorequestsfromcontentproducers,DolbyLaboratoriesmodifiedthe

definitionsofseveralmetadataparametersfromtheiroriginaldefinitionasdescribedin

ATSCdocumentA/52.Thereviseddefinitionsallowmoreinformationtobecarriedabout

theaudioprogramandalsoallowmorechoicesforstereodownmixing.Whenthe

metadataparameterscarriedinDolbyDigitalwerefirstdescribed,theyweregenerically

calledBitstreamInformation,orBSI.Werefertotheadditionalparameterdefinitionsas

ExtendedBSI.

Becausethereviseddefinitionsaffectmetadataparametersthatwerenotusedbythe

consumerdecoders,alldecoderswillbecompatiblewiththerevisedbitstream.Newer

decodersthatareprogrammedtodetectanddecodethenewparameterswillbeableto

implementthenewfeaturesExtendedBSIprovides.

Productsthatallowemulationoftheeffectsofmetadata,suchastheDP570,normallyhave

afeaturethatallowsemulationofanew(orcompliant)decoderoralegacydecoder.

ThisparameterallowstheproducertoselecteithertheLt/RtortheLo/Rodownmixina

consumerdecoderthathasstereooutputs.Consumerreceivers��areabletooverridethis

selection,butthisparameterprovidestheopportunityfora5.1‐channelsoundtracktoplay

inLo/Romodewithoutuserintervention.Thisisespeciallyusefulonmusicmaterial.

Note:Thisparametershouldalwaysbeturnedoffwhenyouareworkingwithsteady

statetonesfortestingpurposes;calibrationdiscsforexample.

Table D-20 Surround Phase Shift Setting

Enabled

Disabled

Table D-21 Preferred Stereo Downmix Mode Setting

NotIndicated

Lt/RtPreferred

Lo/RoPreferred