Dolby Laboratories DP570 Audio Production Information , Mixing Level, Room Type, Copyright Bit

Parameter Definitions
Dolby® DP570 Multichannel Audio Tool User’s Manual 97
Audio Production Information
Thisparameterindicateswhetherthemixinglevelandroomtypevaluesarevalid.Ye s
indicatesthatareceiveroramplifiercanusethesevalues.No indicatesthatthesevaluesare
invalid.Inpractice,onlyhigh‐endconsumerequipmentimplementsthesefeatures.
Mixing Level
TheMixingLevelparameterdescribesthepeakSPLduringthefinalmixingsessionatthe
studiooronthedubbingstage.Theparameterallowsaconsumer’samplifiertosetits
volumecontroltomatchthatofthemixingroom.Thiscontroloperatesinadditiontothe
dialoguelevelcontrol,andisbestthoughtofasthefinalvolumesettingontheconsumer’s
equipment.ThisvaluecanbedeterminedbymeasuringtheSPLofpinknoiseatstudio
referencelevelandthenaddingtheamountofdigitalheadroomabovethatlevel.For
example,if85dBequatestoareferencelevelof–20dBFS;themixinglevelis85+20,or
105 dB.
Room Type
TheRoomTypeparameterdescribestheequalizationusedduringthefinalmixingsession
atthestudiooronthedubbingstage.Alargeroomisadubbingstagewiththeindustry
standardX‐curveequalization;asmallroomhasflatequalization.Thisparameterallows
anamplifiertobesettothesameequalizationasthatheardinthefinalmixing
environment.
Copyright Bit
ThisparameterindicateswhethertheencodedDolbyDigitalbitstreamiscopyright
protected.IthasnoeffectonDolbyDigitaldecodersanditspurposeispurelytoprovide
information.
Table D-11 Audio Production Information Settings and Definitions
Audio Production
Information Setting Definition
Yes MixingLevelandRoomTypeparametersarevalid.
No MixingLevelandRoomTypeparametersareinvalid
andshouldbeignored.
Table D-12 Mixing Level Settings
Mixing Level
80to111dBin1dBincrements
Table D-13 Room Type Settings
Room Type
NotIndicated
Large
Small
Table D-14 Copyright Bit Settings
Copyright Bit
Yes
No