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4 Dolby
®
DP570 Multichannel Audio Tool User’s Manual
Overview Main Applications
TheCat.No.548AnalogOptionCardprovidesananalogmonitorsectionandsome
additionalfeaturestoeaseinterfacingtoexistingmixingandmonitoringenvironments.
Thisoptionalanalogmonitorsectionprovidesfeaturesincludingmultiple
speaker‐configurationoutputs,amastervolumecontrol,speakertrimcontrols,andan
inputforaconsolesolo
bus.
1.4 Main Applications
TheDP570canbesuccessfullydeployedwhereverthereisaneedtomonitorthequalityof
digitalaudio,andtoreviewexistingmetadata.Itiscurrentlymostcommonintwo
applications:
•DVDmastering
• CreationandbroadcastofDTVcontent
1.4.1 Use in DVD Mastering
ADVDauthoristypicallypreparingmixedaudioforwritingtotheDVD:generating
metadata,verifyinglevels,andauditioningdownmixes.Thisprocessisdescribedindetail
inUsingtheDP570inDVDMasteringonpage 43.
1.4.2 Use in Digital Television
Here’sanexampleoftheprocessflowinDTV:
Inabroadcasttruckparkedoutsideafootballstadium,theprogrammixerchoosesthe
appropriatemetadatafortheaudioprogrambeingcreated.Theresultingaudioprogram,
togetherwithmetadata,isencodedasDolbyEdataandsenttothetelevisionstationvia
fiber,microwave,orothertransmissionlink.ThisprocessisdiscussedindetailinUsingthe
DP570inLiveRemoteBroadcastonpage 47.
Atthereceivingendofthistransmission,theDolbyEstreamisdecodedbacktobaseband
audioandmetadata.Theaudio programandthemetadataaremonitored,altered,or
re‐createdasotherelementsoftheprogramareaddedinpreparationforbroadcast.This
processisdiscussedindetailinUsingtheDP570inPostproductiononpage 53.
Thisnewaudioprogram/metadatapair,reencodedasDolbyEdata,leavesthe
postproductionstudioandpassesthroughthetelevisionstationtoMasterControl,
where
manyincomingDolbyEstreamsareonceagaindecodedbacktotheirindividualbaseband
digitalaudio/metadataprograms.Theaudioprogram/metadatapairthatisselectedtoair
issenttothetransmission DolbyDigitalencoder,whichencodestheincomingaudio
programaccordingtothemetadatastreamassociatedwithit,therebysimplifying
the
transmissionprocess.ThisprocessisdiscussedindetailinUsingtheDP570inMaster
Controlonpage 57.
Finally,theDolbyDigitalsignalisdecodedintheconsumer’shome,withmetadata
providingtheinformationforthatdecodingprocess.Throughtheuseofmetadata, the
mixerinthetruckhasbeenable
tocontrolthehomedecoderforthesportingevent,while
segmentssuchasnewsbreaks,commercials,andstationIDsaresimilarlydecoded,each
usingitsownmetadata.