Dolby Laboratories DP570

Using the DP570 Features Measuring and Setting the Dialogue Level

Dolby® DP570 Multichannel Audio Tool User’s Manual 33

theshort‐termmeasurement,astheyfindtheinformationonnear‐termdynamicstobe

veryusefulwhenmixingorproducingaprogram.Theseoperatorsarecapableof

managingoverallprogramloudnessbycontinuouslyreadingandinterpretingthe

short‐termmeasure2.

Table 4 ‐2listsseveralexampleapplicationsforbothmeasurementmodes.

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,Leq(A),sothedisplaystabilizesastheclipcontinues.

2 We do not recommend averaging multiple short-term measurements, either arithmetically or by summing the

anti-logs, to come up with a long-term average, since each of the short-term measurement values is valid only for

the previous ten-second period. Consider a situation where the operator takes a 60-second measurement in

Short-term mode. The measurement value displayed at the end of the period represents only the time interval from

second 50 to second 60, not the entire minute. Instead, use the Infinite term measure and Pause function.

Table 4-2 Measurement Mode Applications

Short-term Infinite

Livebroadcastevent Programingest

Postprodu ctionand/ormixingwith

audioengineer

Postprodu ctionto��checkconformancewith

deliveryrequirements,includingdialogue

normalizationvalue

Qualitycontrol:measuringshort‐term

programdynamics

Qualitycontrol:measuringoverallprogram

fornormalizationand/ordialogue

normalizationprovisioningpurposes

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re‐measuretheselectedaudioclip.