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Join Date: Aug 1999
Location: Washington DC area
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Blu-ray specs require that any TrueHD track be accompanied by a legacy Dolby Digital track (usually 640 kbps in practice) for backwards compatibility. However, even though technically it's a separate DD track, the BD spec causes it to *act* like a "core" stream. For instance, the disc-packaging might only mention the Dolby TrueHD soundtrack and not the standard Dolby. Also, I'm not sure if the standard Dolby is made available as an option in the menu.... I think you might only see the TrueHD soundtrack option in the audio setup choices.
ALL BD players will stream the Standard Dolby "core" (core in quotes here) out the traditional coax/optical digital output for those with standard receivers. This is true even if your BD player can decode TrueHD and/or has HDMI 1.3. In other words, if you select the Dolby TrueHD soundtrack, you'll be able to hear the 5.1 Dolby Digital (probably at 640) out the SPDIF digital ouptut. That's automatic because the player knows you can't put TrueHD on an old-fashioned SPDIF digital cable.
If you have a built-in TrueHD decoder (like in the PS3) you should also be able to hear the Lossless TrueHD converted to 2.0 PCM via the SPDIF output, depending on your player settings.
1080p and lossless audio. EVERY BD should have them both.