4Dolby® DP570 Multichannel Audio Tool User’s Manual
Overview
TheCat.No.548AnalogOutputCardprovidesananalogmonitorsectionandsome
additionalfeaturestoeaseinterfacingtoexistingmixingandmonitoringenvironments.
Thisoptionalanalogmonitorsectionprovidesfeaturesincludingmultiple
speaker‐configurationoutputs,amastervolumecontrol,speakertrimcontrols,andan
inputforaconsolesolobus.
1.4 Main Applications
TheDP570canbesuccessfullydeployedwhereverthereisaneedtomonitorthequalityof
digitalaudio,andtoreviewexistingmetadata.Itiscurrentlymostcommonintwo
applications:
•DVDmastering
• CreationandbroadcastofDTVcontent

1.4.1 Use in DVD Mastering

ADVDauthoristypicallypreparingmixedaudioforwritingtotheDVD:generating
metadata,verifyinglevels,andauditioningdownmixes.Thisprocessisdescribedindetail
inChapter 5.

1.4.2 Use in Digital Television

Here’sanexampleoftheprocessflowinDTV:
Inabroadcasttruckparkedoutsideafootballstadium,theprogrammixerchoosesthe
appropriatemetadatafortheaudioprogrambeingcreated.Theresultingaudioprogram,
togetherwithmetadata,isencodedasDolbyEdataandsenttothetelevisionstationvia
fiber,microwave,orothertransmissionlink.Thisprocessisdiscussedindetailin
Chapter 6.
Atthereceivingendofthistransmission,theDolbyEstreamisdecodedbacktobaseband
audioandmetadata.Theaudioprogramandthemetadataaremonitored,altered,or
re‐createdasotherelementsoftheprogramareaddedinpreparationforbroadcast.This
processisdiscussedindetailinChapter7.
Thisnewaudioprogram/metadatapair,reencodedasDolbyEdata,leavesthe
postproductionstudioandpassesthroughthetelevisionstationtoMasterControl,where
manyincomingDolbyEstreamsareonceagaindecodedbacktotheirindividualbaseband
digitalaudio/metadataprograms.Theaudioprogram/metadatapairthatisselectedtoair
issenttothetransmissionDolbyDigitalencoder,whichencodestheincomingaudio
programaccordingtothemetadatastreamassociatedwithit,therebysimplifyingthe
transmissionprocess.ThisprocessisdiscussedindetailinChapter8.
Finally,theDolbyDigitalsignalisdecodedintheconsumer’shome,withmetadata
providingtheinformationforthatdecodingprocess.Throughtheuseofmetadata,the
mixerinthetruckhasbeenabletocontrolthehomedecoderforthesportingevent,while
segmentssuchasnewsbreaks,commercials,andstationIDsaresimilarlydecoded,each
usingitsownmetadata.