user manual

98 Dolby
®
DP570 Multichannel Audio Tool User’s Manual
A Guide to Dolby Metadata Parameter Definitions
Audio Production Information
Thisparameterindicateswhetherthemixinglevelandroomtypevaluesarevalid.Yes
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allow s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.
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 Setting
Mixing Level Setting
80to111dBin1dBincrements
Table D-13 Room Type Setting
Room Type Setting
NotIndicated
Large
Small