A Guide to Dolby Metadata Extended Bitstream Information Parameters
Dolby® DP570 Multichannel Audio Tool User’s Manual 103
D.7.5 Lo/Ro Surround Downmix Level
ThisparameterindicatesthelevelshiftappliedtotheSurroundchannelswhen
downmixingtoanLo/Rooutput.WhenExtendedBSIparametersareactive,thisparameter
replacestheSurroundDownmixLevelparameterintheuniversalparameters.
D.7.6 Surround EX Mode
ThisparameterisusedtoidentifytheencodedaudioasmaterialencodedinSurround
EXTM.ThisparameterisonlyusediftheencodedaudiohastwoSurroundchannels.An
amplifierorreceiverwithDolbyDigitalSurroundEXdecodingcanusethisparameteras
aflagtoswitchthedecodingonoroffautomatically.Thebehaviorissimilartothatofthe
DolbySurroundModeparameter.
1.000(0.0dB)
0.841(–1.5dB)
0.707(–3.0dB)
0.595(–4.5dB)
0.500(–6.0dB)
0.000(–999dB)
Table D-25 Lo/Ro Surround Downmix Level Settings

Lo/Ro Surround Downmix

Level Setting
0.841(–1.5dB)
0.707(–3.0dB)
0.595(–4.5dB)
0.500(–6.0dB)
0.000(–999dB)
Table D-26 Surround EX Mode

Surround EX Mode

NotIndicated
NotSurroundEX
DolbySurroundEX
Table D-24 Lo/Ro Center Downmix Level Setting

Lo/Ro Center Downmix

Level Setting