- Dolby Multichannel Audio Tool User's Manual

Typical Tasks
Dolby
®
DP570 Multichannel Audio Tool User’s Manual 57
Figure8‐3 
Figure 8-2 Typical Downmix Options
Or,ifaviewercomplainsabouttheaudioqualityonamonotelevisionwhenviewinga5.1
program,theMCoperatorcanquicklyselectMonointheDownmixsection,andRFto
emulatetheviewerʹslisteningconditions.
8.2.2 Monitoring Dialogue Level
Whenchangingprogramsorchannels,refertothedialoguelevelindicatorstoverifythat
thedialoguelevelvaluesetinthesoftware—thegreennumbersinFigure 8‐3—andthe
measuredvalueofspeech—theyellownumbersinFigure 8‐3—match±2dB.
Figure8‐4 ‐
Figure 8-3 Dialogue Level Controls
Ifthedialoguelevelvaluedoesn’tmatch,werecommendadjustingtheoverallaudiolevel
untilitdoes.
Inmostcasesshort‐termmeasurementsarebestastheyprovideameasurementovera10‐
secondperiodofprogramaudioanddonotaveragethemeasurementoveralongperiod
oftime.For
moreinformationonthemeasurementmodes,seeMeasuringtheAverage
LoudnessofIdentifiedClipsonpage 28.
Note: Asingleprogrammusthaveasingledialoguelevelvalue,andthisvalueshouldnot
changewithintheprogram.Adjustaudiolevelstomatchthedialoguelevelif
necessary,ratherthantheotherwayaround.