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In Reply to: Trey Anastasio - Shine (DD) only 16/48 ??? (!) posted by AudiophileBob on November 5, 2005 at 06:29:16:
And cut by about 3-6dB. Some other folks were saying that it being 'quieter on the DVD side' means it is 'uncompressed' - not so. just seems to be normalized to -6dB on most of these DualDisc titles.
Follow Ups:
Your supposition is sorta hard for me to follow.
I doubt that the master was 16/44.1, so why upsample to 48 ?Sample rate would affect bandwidth spectrum, not headroom, so compression ratio would likely be the same because of the common word-length. Unless there's some other factor that I'm not aware of.
Why knock off 6db of headroom for DVD-V ? The DVD-V DACs all do 24 bit.The compression on this album and Fletcher-Munson eq would seem to be some of the highest that I've ever heard. Again, unless there's some other factor that I don't know of. (Maybe an exciter ?)
I feel that this was a concious decision based on content and aural
palette.I'm learning something new about this digital audio thing everyday.
My ears are telling me that the 16/48 side is cleaner, especially on the top-end.
Could be a placebo.
> > why upsample to 48 ? < <Because the minimum specification for LPCM on DVD-V is 16/48.
Thanks for confirming the 16/48 content on the DVD-V side.What I meant about the upsampling was that I doubted that the master was 16/44.1, but who knows ?
But that doesn't mean it didn't go 48-44.1-48. Most post-production practices on mass-produced albums would scare you.As Racerguy said, the only reason it is 48khz is because the DVD-V minimum spec is 48khz.
Look at a post I made earlier where I analyzed both sides of a "Enhanced LPCM" DualDisc. If you want, I can do a spectrum of both, too; i'm almost positive they will both roll off at 22050, not 24000.
The 3-6dB cut that I've seen on most DVD-V sides (versus the CD side) make me believe that the DVD-V LPCM track was derived from the RBCD/CDDA track, not the other way around.
Unless the 48/16 track cut by 3-6dB *IS* the first stage, and the sound is just 'boosted' by 3-6dB on the CD side. In either case: you get 48khz that isn't really 48khz one way, or 16 bit that isn't really 16 bit, the other. (14-15 bits actualized after a 3-6dB drop.)
... and you did say the rolloff was 22.05, which is proof enough for me.The 3-6dB cut is because of a video post processing standard to avoid clipping in some broadcast equipment. I can't remember the actual standard, but i think you are never allowed to exceed -1dB, and strongly recommended to stay under -3dB.
I wish they have this rule for CDs - it would avoid 0dBFS+ mastering errors.
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