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Dolby Laboratories DP570 Stereo System User Manual

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DP570 Multichannel Audio Tool User’s Manual

A Guide to Dolby Metadata Parameter Definitions

Dialogue Level

TheDialogueLevelparameterisdiscussedinDialogueLevelonpage 86.

Channel Mode

Thisparameter(alsoknownasAudioCodingmode)indicatestheactivechannelswithinthe

encodedbitstreamandaffectsboththeencoderandconsumerdecoder.Thisparameter

instructstheencoderwhichinputstouseforthisparticularprogram;ittellsthedecoder

whatchannelsarepresentinthisprogramsothe

decodercandelivertheaudiotothe

correctspeakers.

ThesettingisdescribedasX/Y,whereXisthenumberoffrontchannels(Left,Center,

Right)andYthenumberofrear(Surround)channels.

TheavailabilityofcertainchannelmodesdependsontheDolbyDigitalencoderdatarate

andwhetherthe

LFEchannelispresent.Forexample,youcan’thaveamonostreamwith

anLFEchannel(1.1)ora3/2streamat96kbps.Appropriatedataratesareshowninthe

definitionofeachsetting.

LFE Channel

ThestatusoftheLFEChannelparameterindicatestoaDolbyDigitalencoderwhetheran

LFEChannelispresentwithinthebitstream.ChannelmodedetermineswhethertheLFE

Note:ThepresenceoftheLFEchannelisindicatedbyatheLFEChannelparameter.

Table D-4 Channel Mode Definition and Data Rates

Channel Mode

Setting

Definition and Data

Rate

1+1 Dualmono(notvalidfor

DTVbroadcastorDVD

production)

1/0Mono Fr om56kbps,usually96

kbps

2/0Stereo From96kbps,usually192

kbps

3/0 From256kbps

2/1 From256kbps

3/1 From320kbps

2/2 From320kbps

3/2 From384kbps,often448

kbps

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