A Guide to Dolby Metadata Metadata Overview
Dolby® DP570 Multichannel Audio Tool User’s Manual 85
Therearetwofunctionalclassificationsofmetadata:
Professional—TheseparametersarecarriedonlyintheDolbyEbitstream.Theyareused
toautomaticallyconfigureadownstreamDolbyDigitalencoder,allowingmaximum
controlbythecontentproduceroverhowtheencodedbitstreamistreatedateachstepon
thewaytotheconsumer’sdecoder.
ConsumerTheseparametersarecarriedinboththeDolbyEandtheDolbyDigital
bitstream.Theconsumer’sDolbyDigitaldecoderusestheseparameterstocreatethebest
possibleaudioprogrampossibleoneachconsumer’splaybacksystem.Consumer
parametersincludetheDRCvalues,whichareultimatelyenabledbytheenduser ’s
selection,asdiscussedinDynamicRangeControlonpage88.
Bothtypesofmetadatacanbeexamined,modified,orpassedthroughduringencoding.
Tabl e D1liststheactivemetadataparametersandindicateswhethertheparameteris
ProfessionalorConsumer.
Table D-1 Profession and Consumer Metadata Types
Metadata Parameter Professional Consumer
ProgramConfiguration x
ProgramDescriptionText x
DialogueLevel x
ChannelMode x
LFEChannel x
BitstreamMode x
LineModeCompression x
RFModeCompression x
RFOvermodulationProtection x
CenterDownmixLevel x
SurroundDownmixLevel x
DolbySurroundMode x
AudioProductionInformation x
MixLevel x
RoomType x
CopyrightBit x
OriginalBitstream x
PreferredStereoDownmixax
Lt/RtCenterDownmixLevelax
Lt/RtSurroundDownmixLevelax
Lo/RoCenterDownmixLevelax
Lo/RoSurroundDownmixLevelax
DolbySurroundEXModeax
A/DConverterTypeax
DCFilter x