Support User Manuals

Dolby Laboratories DP570 Stereo System User Manual

Open as PDF

of 127

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.

D.7.1 Preferred Stereo Downmix Mode

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

Surround Phase

Shift Setting

Enabled

Disabled

Table D-21 Preferred Stereo Downmix Mode Setting

Preferred Stereo Downmix

Mode Setting

NotIndicated

Lt/RtPreferred

Lo/RoPreferred

previous next