Dolby Laboratories DP570 4.8 Setting Dynamic Range Control, 4.9 Holding Metadata

34 Dolby® DP570 Multichannel Audio Tool User’s Manual
Using the DP570 Features Setting Dynamic Range Control
3. ThedefaultmeasurementmodeisInfinite.ClicktheInfiniteorShortTerm buttonto
movebackandforthbetweenthemodes.
Thesoftwaredisplaystheleveloftheaudioclip.Thislevelisdisplayeduntilyoustart
anewmeasurementorchangemodes.
4. Repeatthesestepswitheachaudioclipselected.TheDP570shouldreturnsimilar
valuesforeachoftheclips.Ifthevariationbetweentheclipsis4dBorless,selecta
valueforthedialoguelevelparameterwithinthatrangethatbestindicatesthe
averageleveloftheprogramcontent.Atanytime,tousethemeasurementlevel
displayedonthesoftware,clickAccept,andthedialoguelevelparameterissetatthat
level.Tosetthedialoguelevelparametermanually,clickanddragtheDialogueLevel
Setslidertothesettingyouwant.
4.8 Setting Dynamic Range Control
Youcanchoosedynamicrangecontrol(DRC)profilesforRFandLinemodes.Usethe
emulatortomonitortheeffectsofeachprofilesettingontheprogramcontentandselectthe
profilethatbestsuitsthematerialineachmode.BothRFandLinemodescanbesettoany
ofthefollowingprofiles:None,FilmStandard,FilmLight,MusicStandard,MusicLight,
andSpeech.Eachprofileisasetofcompressionparameterssuchasratio,attack,and
release.
Fordetailedinformation,seeDynamicRangeControlProfilesonpage89.
TheCustomadjustmentontheemulatorallowsyoutosimulateaconsumerdecoderwith
theabilitytovarytheamountofDRCapplied.ThisvariationistotheLinemodeprofile
youhaveselected.Likeallemulatorcontrols,itdoesnotaffectthemetadataorrouter
outputstreams.
Tomodifythedefaultprofileintheremotesoftware,usethedrop‐downlistsandcheck
boxesontheDynamicRangemetadatatab.
4.9 Holding Metadata
TheMetadataHoldbuttonshowninFigure 4‐6allowsyoutorepeattheselectedmetadata
foraslongasyoulike.Whenyoupressit,theDP570“holds”themetadataforthecurrent
frameandrepeatsitineachframeuntilyouclickthebuttonagaintoturnthefeatureoff.
Figure 4-6 Metadata Hold Button
Tip:IftheDP570measuresmorethana4dBdifferenceintheaudioclips,reconsiderthe
clipsyouhavechosen,recallingthattheseclipsshouldrepresentnormalspeech
levelinyourcontent.
Tip:Remembertosetthedialoguelevelparameterproperlybeforemakingjudgments
aboutDRC.