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A Guide to Dolby Metadata Parameter Definitions

Dolby

®

DP570 Multichannel Audio Tool User’s Manual 95

Channelparametercanbeset.Youmusthaveatleastthreechannelstobeabletoaddan

LFEchannel.

Bitstream Mode

ThisparameterdescribestheaudioservicecontainedwithintheDolbyDigitalbitstream.

Acompleteaudioprogrammayconsistofamainaudioservice(acompletemixofallthe

programaudio),anassociatedaudioservicecomprisingacompletemix,oronemain

servicecombinedwithanassociatedservice.Toforma

completeaudioprogram,itmaybe

(butrarelyis)necessarytodecodebothamainserviceandanassociatedserviceusinga

maximumtotalbitrate of512kbps.RefertotheGuide totheUseoftheATSCDigi talTelevision

Standard,DocumentA/54forfurtherinformation.Althoughadetailed

descriptionofeach

optionfollows,inpractice,mostprogrammingusesthedefaultsetting,CompleteMain.An

exampleofanexceptiontothisruleisaspecialkaraokeDVD,oranemergencyservice

withindigitaltelevision.

Table D-5 LFE Channel Settings

LFE Channel Setting

Enabled

Disabled

Table D-6 itstream Mode Options

Bitstream Mode

Setting

Definition

CompleteMain(CM) CMflagsthebitstreamasthemainaudioservicefortheprogram

andindicatesthatallelementsarepresenttoformacompleteaudio

program.Currently,thisisthemostcommonsetting.TheCM

servicemaycontainfromone(mono)tosix(5.1)channels.

MainM&E(ME) Thebitstreamis

themainaudioservicefortheprogram,minusa

dialoguechannel.Thedialoguechannel,ifany,isintendedtobe

carriedbyanassociateddialogueservice.Differentdialogue

servicescanbeassociatedwithasingleMEservicetosupport

multiplelanguages.

Assc.VisualImp.(VI) Thisistypicallyasingle‐channelprogramintendedtoprovidea

narrativedescriptionofthepicturecontenttobedecodedalong

withthemainaudioservice.TheVIservicemayalsobeacomplete

mixofallprogramchannels,comprisinguptosixchannels.

Assc.HearImp.(HI) Thisistypicallyasingle‐channelprogramintendedtoconvey

audio

thathasbeenprocessedforincreasedintelligibilityanddecoded

alongwiththemainaudioservice.TheHIservicemayalsobea

completemixofallprogramchannels,comprisinguptosix

channels.

Assc.Dialogue(D) Thisistypicallyasingle‐channelprogramintendedtoprovidea

dialoguechannelforan

MEservice.IftheMEservicecontainsmore

thantwochannels,theDserviceislimitedtoonlyonechannel;ifthe

MEserviceistwochannels,theDservicecanbeastereopair.The

appropriatechannelsofeachservicearemixedtogether(requires

specialdecoders).

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