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"The dream never dies, just the dreamer."
It looks to me like DTS's intent was that additional and/or replacement audio should blend seamlessly with the existing soundtrack; this text says that the replacement material is limited to 5.1. If a portion of a 7.1 DTS-HDMA playback was replaced by a 5.1 secondary audio, I don't think you could call that seamless! So it makes sense to limit the source BD track used to 5.1 lossless, if there is replacement/secondary audio to be inserted somewhere during playback of the movie...Quote:
Secondary and Sub-Audio with DTS Express
Compared to standard DVD, Blu-ray Disc and HD DVD formats deliver incredible interactive features. The new high-def players come equipped with an Ethernet port, delivering a whole world of content that can be streamed or downloaded over the Net. This streaming content can be seamlessly overlaid on the principle title without interrupting playback. Now, months after buying a movie or concert disc, you can receive feature updates such as directors' commentaries, extra scenes, and additional songs.
When these new entertainment features are streamed in, your player will actually mix the audio portion of the new content with the audio already on the disc. The new audio is called Secondary Audio on Blu-ray Disc and can be up to 5.1 channels; on HD DVD this is called Sub Audio and can be in 2.0 channels. DTS uses a system called DTS Express to deliver Secondary or Sub Audio to your player. The DTS Express stream is decoded by your player and then mixed with the Primary Audio, giving you an intensely great interactive surround experience.
The mixed audio can then be outputted to an AV Receiver as a LPCM digital stream over an HDMI [...] connection. [...]
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