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Dolby Laboratories DP570 Stereo System User Manual

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DP570 Multichannel Audio Tool User’s Manual

A Guide to Dolby Metadata Metadata Overview

DolbyEisaprofessionaltechnologyusedforbroadcastapplications,suchasprogram

originationanddistribution;theDolbyEbitstreamcarriestheentiremetadataparameter

set.DolbyDigital,usedforconsumerapplications,suchastransmissiontothehomeorfor

DVDauthoring,employsasubsetofthefullmetadataparameterset

calledDolbyDigital

metadata;theDolbyDigitalbitstreamcarriesonlythoseparametersnecessaryforproper

decodingbytheconsumer.

Metadataisfirstinsertedduringprogramcreationormastering,andiscarriedthrough

transmissioninabroadcastapplicationordirectlyontoaDVD.Themetadataprovides

controloverhowtheencodedbitstream

istreatedateachsteponthewaytotheconsumer’s

decoder.

Thiscontrol,however,requirestheproducertosetthemetadataparameterscorrectly,since

theyaffectimportantaspectsoftheaudio—andcanseriouslycompromisethefinal

productifsetimproperly.Althoughmostmetadataparametersaretransparentto

consumers,certain

parametersaffecttheoutputofahomedecoder,suchasdownmixing

foraspecificspeakerconfiguration,orwhentheconsumerchoosesDynamicRange

Controltoavoiddisturbingfamilyandneighbors.

Figure D‐1showsa5.1+2ProgramConfig,consistingofa5.1‐channelprogramand a

two‐channelsecondaryaudio

program(SAP).

Figure D-1 Metadata Flow from Production to Consumer

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