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This bit doesn't make any sense to me...
You'll also be able to download "Super HD" songs—tunes remastered in DVD Audio or SACD in 5.1 surround or 2.0 stereo with sample rates at 11,000 kbps.
"Remastered in DVD or SACD"???????????
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Post by Claude February 1, 2008 (3 of 6)
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threerandot said:
Are we going to see Super Audio CD and DVD-Audio downloads?
Please no more format war. Let's just call them hi-rez downloads ;-)
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Post by hok007 February 1, 2008 (4 of 6)
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FunkyMonkey said:
"Remastered in DVD or SACD"???????????
The press release states: "MusicGiants also offers Super HD downloads (as in re-mastered DVD Audio or SACDs available in either 5.1 surround sound or 2.0 stereo) which play at sample rates up to 11,000 kbps"
I take this to mean that they will be remastering *from* DVD-A or SACD *into* some sort of WMA-style format that streams at 11,000 kbps. In other words, they're going to port DVD-A and SACD source material into a third format. There's no indication whether this will be a lossless process or involve down-conversion (lossy) of some sort. I would imagine the latter.
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Post by Livy February 1, 2008 (5 of 6)
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hok007 said:
The press release states: "MusicGiants also offers Super HD downloads (as in re-mastered DVD Audio or SACDs available in either 5.1 surround sound or 2.0 stereo) which play at sample rates up to 11,000 kbps"
I take this to mean that they will be remastering *from* DVD-A or SACD *into* some sort of WMA-style format that streams at 11,000 kbps. In other words, they're going to port DVD-A and SACD source material into a third format. There's no indication whether this will be a lossless process or involve down-conversion (lossy) of some sort. I would imagine the latter.
Interesting, as I believe normal CD's have a bit rate of about 1200 kbps, could SA-CD be that much higher?
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Livy said:
Interesting, as I believe normal CD's have a bit rate of about 1200 kbps, could SA-CD be that much higher?
They definitely could. After all the sampling rate is 64x higher than CD (though admittedly on the other hand the 'resolution' is lower).
11,000 kbps, that's about 11 Mbps, which is close to the maximum bitrate of DVD-Video. Since both SACD and DVD are based on a 4.7GB format disc that makes sense at first sight.
Now let's see:
SACD with 2.8 MHz sampling rate at 1-bit resolution per channel would give about 5.6 Mbps transfer rate for stereo and 16.8 Mbps transfer rate for multichannel, though DST with a (lossless) compression of about 50% would reduce that to 8.4 Mbps.
The calculation for DVD-Audio is a bit more complicated due to the many combinations possible, but probably they kept the same limit of 10.88 Mbps that was agreed for DVD-Video.
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