Thread: Blue Ray Disc could damage SACD & DVD-A

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Post by SurroundGod January 5, 2005 (21 of 23)
If you look at Blu-Ray's current (unratified) audio specifications there is NO mention of DSD at any resolution... at all.

The last I heard it was a locked 27 Megabits/sec (up to) for an audio stream and 8 channel discrete 24/192 Linear PCM as the maximum output. Uncompressed.

At the moment lossless compression (if used in Blu-Ray) means DTS-HD, which is unproven compared to MLP. The claim is that it holds a backwards compatible DTS 5.1 lossy core and then extention files with lossless information and a wide variety of discrete channel capabilities for DTS-HD decoders. Supposedly, it combines the two streams together to create the lossless output. How it can do this and also get rid of the spurious problems of lossy compression and a fixed 6 channel core, I don't know.

It may be that Sony and their partners are planning to replace SA-CD's with Blu-Ray audio discs, and then again their sites may be more on HD video and having audio as a side thing, or keep SA-CD as the audiophile niche.

Then yet again, perhaps they have something else planned for the audio-only sector of the market with a completely different set of specs., yet still using their Blu-Ray discs.

Dan

Post by jdaniel@jps.net January 5, 2005 (22 of 23)
Whatever happens with blu-ray, Sony warns it wont be available for a couple of years.

Post by mdt January 6, 2005 (23 of 23)
SurroundGod said:

If you look at Blu-Ray's current (unratified) audio specifications there is NO mention of DSD at any resolution... at all.

The last I heard it was a locked 27 Megabits/sec (up to) for an audio stream and 8 channel discrete 24/192 Linear PCM as the maximum output. Uncompressed.

At the moment lossless compression (if used in Blu-Ray) means DTS-HD, which is unproven compared to MLP. The claim is that it holds a backwards compatible DTS 5.1 lossy core and then extention files with lossless information and a wide variety of discrete channel capabilities for DTS-HD decoders. Supposedly, it combines the two streams together to create the lossless output. How it can do this and also get rid of the spurious problems of lossy compression and a fixed 6 channel core, I don't know.

It may be that Sony and their partners are planning to replace SA-CD's with Blu-Ray audio discs, and then again their sites may be more on HD video and having audio as a side thing, or keep SA-CD as the audiophile niche.

Then yet again, perhaps they have something else planned for the audio-only sector of the market with a completely different set of specs., yet still using their Blu-Ray discs.

Dan

I see blue ray as the carrier for HD video following DVD-V, just like SA-CD (or DVD-A for those who cant let it)is the hi res audio sucessor to CD audio.

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