
Dolby® DP570 Multichannel Audio Tool User’s Manual 57
Chapter 8
Using the DP570 in MasterControlDolby®Eencodingiscommonlyusedtodistributemultichannelaudiofromanetwork
centertomultipleaffiliatestations,usuallyviasatelliteoropticalfiber.TheDP570provides
quickandaccurateemulationofmultiplelisteningenvironmentsduringDolbyE
encoding.
8.1 Connecting the DP570
Figure8‐1showsatypicalsetupforthis application,wheremastercontrolrequirements
dictatethataudioswitchingoccursdiscretely,andthattheaudiomustbeencodedintoa
DolbyEsignalpriortotransmission.ThesourceaudioisaDolbyEstream,eitherplayed
outfromaVTRorserver,orreceivedlivethroughanIRD.Thestreamisprocessedbythe
DP572,providingdiscretesignalstothemastercontrolswitcherinputs.Theswitcher
outputissenttotheDP571forDolbyEencoding,andalsototheDP570formonitoringand
metadatamodification.
Note:Inthisexample,themetadataoutputfromtheDP572decoderispassedthroughthe
mastercontrolswitcherviaaseriallayer.The“air”serialoutputisconnectedtothe
DP571andthe“preview”outputsofthemastercontrolswitchertotheDP570.
Morethantwometadatastreamscanbeswitchedifnecessary.TheDP571output
thengetsmultiplexedwithvideointheMPEGtransportstreamandsentfor
distribution.