Dolby Laboratories DP570

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measure2.

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

Postproduct ion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