- Dolby Multichannel Audio Tool User's Manual

30 Dolby
®
DP570 Multichannel Audio Tool User’s Manual
Using the DP570 Features
Figure4‐6 
Figure 4-5 Short-term Measurements
Sincetheshort‐termmeasurementconsidersonlytheprevious10secondsofprogram
material,themeasuredvaluecanbemuchmoredynamicthanthemeasuredvaluein
Infinitemode.
Thebenefitofshort‐termmeasurementisthatitallowstheoperatortoseeshort‐term
variationsinloudnesslevelwithina
program.Manyskilledaudiooperatorsprefertouse
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measure
2
.
Table 4‐2listsseveralexampleapplicationsforbothmeasurementmodes.
Note: Inprogrammingthatincludesheavydynamicsprocessing,andthereforeasmaller
dynamicrange,theshort‐termmeasurementmaynotbeconsiderablymore
dynamicthantheinfinite.
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10‐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Infinite
termmeasurementandthePausefunction.
Table 4-2 Measurement Mode Applications
Short-term Infinite
Livebroadcastevent Programingest
Postproductionand/ormixingwith
audioengineer
Postproduction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
:01 :02 :07 :08 :09 :11 :12 :13 :14 :16 :17 :18 :19
:00
:05
:10 :20
:03 :06 :04
:15
Measurement 10
Measurement 1
Measurement 2
Measurement 3