Dolby Laboratories DP570 4.8 Setting Dynamic Range Control

Setting Dynamic Range Control
Dolby® DP570 Multichannel Audio Tool User’s Manual 31
Figure4‐7
Tomeasuredialoguelevelusingtheremotesoftware,usethecontrolsshowninFigure4‐4
forthesesteps:
1. UsetheChannelSelectcontroltochooseachannelorchannelstomeasure.The
choicesare:Left,Right,Stereo,Center,andAll.
2. Playtheaudioclip.
TheDP570beginsmeasuringtheleveloftheaudioclip.Thesoftwaredisplayofthe
measuredlevelvarieswidelyatfirst,butthemeasurementisanaveragelevelover
timesothedisplaystabilizesastheclipcontinues.
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,
Note: Themeasurementfunctionusedinthefollowingproceduresisdesignedto
measuredialogueonly.Programswithoutdialogue,suchasanall‐musicprogram,
stillrequireacarefulsettingofthedialoguelevelparameter.Whensettingthe
parameterforsuchcontent,itisusefultocomparetheprogramtothelevelofother
programs.Thegoalistoallowtheconsumertoswitchtoyourprogramwithout
havingtoadjustthevolumecontrol.
Note: Iftheinputaudiolevelregistersbelow–31dBFS,theAcceptbuttonisdisabled,as
thosevaluesarenotvalidsettingsforthedialoguelevelparameter.Below
–40 dBFS,thefront‐paneldisplayreadsLOW.Ineithercase,itisbesttoraisethe
sourceaudiolevelandremeasuretheselectedaudioclip.
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.