Support User Manuals

Dolby Laboratories DP570 Stereo System User Manual

Open as PDF

of 127

Using the DP570 Features Measuring and Setting the Dialogue Level

Dolby

®

DP570 Multichannel Audio Tool User’s Manual 31

characterswithdifferentvocalqualities.Inprogramswithoutdialogue,suchasamusic

concert,sectionsofaveragelevelneedtobeidentified.

Withrepresentativeaudioclipsidentified,youcanusetheDP570tosetthedialoguelevel

parameter.Youcanuseeitherthesoftwareinterfaceorthefront‐panelbuttons;for

this

operationwedescribeusingthesoftwareinterfacefirst.

4.7.2 Measuring the Average Loudness of Identified Clips

ThemeasurementfeaturecompliesfullywithIEC60804(2000 ‐10):Integrating‐Averaging

SoundLevelMeters(Leq(A))andincludestheadditionoftwodistinctmeasurementmodes

relatingtothemeasurementperioditself:infiniteandshort‐term.Thissectiondescribesthe 

behaviorofbothmodes.

IMPORTANT NOTE REGARDING MEASUREMENT ACCURACY:

Leq(A)‐basedmeasurementsaremostaccuratewhentheycoversignalswithsimilar

spectra,suchasdialogue;themoresimilarthespectra,themoreaccuratethemeasurement.

ThisiswhywerecommendtheuseofLeq(A)measurementstoprovisionthedialoguelevel

valuewithinDolbyEandDolbyDigitalbitstreams.TheDP570

measurementfeaturewill

yieldbestresultswhentheoperatormeasuresportionsoftheprogramthatcontainonly

minimalnondialoguematerial.

Using Infinite Measurements

InfinitemeasurementmodeconformstothespecificationsofIEC60804(2000‐10).Inthis

mode,thecalculatedvalueisthelong‐termA‐weightedlevel,Leq(A),integratedoverthe

entireperiodsincethemeasurementwaslastreset.

Infinitemodeistypicallyusedtomeasuretheentiredurationoftheprogram,or

several

longsectionsofaprogram,tofindthelong‐termA‐weightedlevel.SinceDialogue

IntelligenceisavailableonlyintheDolbyLM100BroadcastLoudnessMeter,wesuggest

usingthefollowingstepstoobtainanestimatedLeq(A)valuefortheentireprogram:

1. Reviewtheprogram,notingthelocationsofseveral

representativesectionswhere

dialogueispresent.

2. Cuethebeginningofthefirstselectedsegment.

3. ClickResettoclearpastmeasurements.

4. Measurethefirstsegment,thenclickPausetopausemeasurement.

5. Cuethesecondsegment.

6. ClickPauseagaintoresumemeasurement.

7. Continueinthisfashion,pausingmeasurementbetweenselectedsegmentsuntilthe

programis

completed.

Note:Thesechangesharmonizeboththecoremeasurementalgorithmandthe

measurementmodesbetweentheDP570andtheDolbyLM100Broadcast

LoudnessMeter.DialogueIntelligence™,however,isavailableonlyintheLM100.

previous next