Dolby Laboratories DP570 Using Short-term Measurements

32 Dolby® DP570 Multichannel Audio Tool User’s Manual

Using the DP570 Features Measuring and Setting the Dialogue Level

Thisprocessallowsyoutoaccuratelyestimatetheaveragelevelofalloftheindividual

dialoguesections.1

Thetermrepresentativesectionindicatesashortersectionoftheprogrambeingmeasured

thatcontainsspokendialoguelevelsthatarerepresentativeofthespeechlevelsfound

throughouttheentireprogram.

Infinitemodeismostoftenusediningest,QC,andpostproductionapplicationswhere

audiometadataisbeingauthored,thewholepieceofcontentisavailable,andlevelscan

usuallybecontrolledand/oradjusted.Infinitemodeshouldbeusedinautomatedand

semi‐automatedapplications.

Using Short-term Measurements

Short‐termmeasurementmodedisplaystheLeq(A)measurementvalueforonlythe

previousten‐secondperiod.Forexample,thefirstmeasurementvalueisforthetime

intervalbetween0and10seconds,thenextbetween1and11seconds,nextbetween2and

12seconds,andsoforth.Figure 4‐5illustratesthesemeasurements.

Figure 4-5 Short-term Measurements

Sincetheshort‐termmeasurementconsidersonlythepreviousten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

1 The energy average of two or more quantities expressed on a decibel scale differs from the arithmetic average of

the quantities. The DP570 Pause feature allows the user to properly average measurements (in dB) across multiple

sections of programming.

Note:Inprogrammingthatincludesheavydynamicsprocessing,andthereforeasmaller

dynamicrange,theshorttermmaynotbeconsiderablymoredynamicthanthe

infinite.

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Measurement 10

Measurement 1

Measurement 2

Measurement 3