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Dolby Laboratories DP570 Stereo System User Manual

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DP570 Multichannel Audio Tool User’s Manual 57

Chapter 8

Using the DP570 in Master

Control

Dolby

®

Eencodingiscommonlyusedtodistributemultichannelaudiofromanetwork

centertomultipl e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.

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