Direct Information from
http://www.dolby.com
Dolby Digital EX
Dolby Digital Surround EX
Taken from
www.yamaha.co.jp
Dolby Digital EX:
Dolby's latest surround format, this is Dolby Digital with an added center rear channel. The rear center channel is actually matrixed into the two rear channels, and is extracted upon playback. (Formerly called Dolby Digital Surround EX, or Dolby Digital Matrix 6.1.)
...so DD EX = DD Surround EX ...and EX is just matrix-encoded flag and nothing more.
Conclusion, if you want to encode to DD EX you
only need 5+1 ch, 'cause DD EX sound mix is
not encoded as
true 6.1 audio. In DD EX capable encoder select: "Digital Surround EX encoded". Depending on your decoder(if it's EX certified) and speaker configuration (6.1 or 7.1) you will get EX 6.1 or EX 7.1 surround, respectivelly, during playback.
Even if a cinema is not equipped with the extra Surround EX speakers in the rear, the information intended for it will be played through the traditional left and right surround channels - so always keep DD_encoder's option "Digital Surround EX encoded" selected, in order to get additional psycoacoustic-sound info.
Stereo to 6.1 upmixing is only useful if you have DTS-ES Discrete or Dolby Digtial Plus or Dolby TrueHD.
Stereo to 7.1 - Dolby Digtial Plus or Dolby TrueHD.
btw, DVD Architect 4.0 gave me
Dolby Digital AC3 pro