- Dolby Multichannel Audio Tool User's Manual

Dolby
®
DP570 Multichannel Audio Tool User’s Manual 55
Chapter 8
Using the DP570 in
Master Control
Dolby
®
Eencodingiscommonlyusedtodistributemultichannelaudiofromanetwork
centertomultipleaffiliatestations,usuallyviasatelliteoropticalfiber.TheDP570provides
quickandaccurateemulationofmultiplelisteningenvironmentsduringDolbyE
encoding.
8.1 Connecting the DP570
Figure 8‐1showsatypicalsetupforthisapplication,wheremastercontrolrequirements
dictatethataudioswitchingoccursdiscretely,andthattheaudiomustbeencodedintoa
DolbyEsignalpriortotransmission.ThesourceaudioisaDolbyEstream,eitherplayed
outfromaVTRorserver,or
receivedlivethroughanIRD.Thestreamisprocessedbythe
DP572,providingdiscretesignalstothemastercontrolswitcherinputs.Theswitcher
outputissenttotheDP571forDolbyEencoding,andalsototheDP570formonitoringand
metadatamodification.
Note: Inthisexample,themetadataoutputfromtheDP572decoderispassedthroughthe
mastercontrolswitcherviaaseriallayer.The“air”serialoutputisconnectedtothe
DP571and the“preview”outputsofthemastercontrolswitchertothe DP570.More
thantwometadatastreamscanbeswitched
ifnecessary.TheDP571 outputthen
getsmultiplexedwithvideointheMPEGtransportstreamandsentfor
distribution.