[SurroundSound] Re: PS3 SACD rips

Sorry for the long delay, my internet service was taken out by
Hurricane Irene.

Also sorry for the top post but I'm doing it for context, and pardon
the off topic tangent of subject.

On Aug 29, 2:21 am, Hardlok Cafe <hard...@gmail.com> wrote:

> @Joe A -- Your statement "Therefore it is not interchangeable between
> domains and is more akin to a lossy conversion than it is to up/
> downsampling in the same domain of PCM."
> May I ask, is this a definitive conclusion in some AES paper or
> something? I find it hard to understand that converting between two
> completely different methods of recording (and the digital formats
> that store the information) would be akin to a lossy conversion.

If you are familiar with video processing, there is a good analogy
that comes to mind -- color spaces. In video processing things are
usually expressed in some variety of the YUV color space -- although
native computer image processing is done in the RGB color space and in
the print world it's the CMYK color space.

This may not be the most appropriate analogy but I think it will help
make my case.

YUV and RGB images are not (losslessly) interchangeable and
information is lost going from RGB->YUV. They are two different
conceptual domains, two ways of recording the same information.

YUV saves bandwidth by eliminating color information, taking advantage
of the fact that the human eye is more sensitive to detail than it is
to color; it gained widespread use first in the analog world for color
broadcasts and persists in today's digital video signal processing.

Which brings me back to my original point -- DSD and PCM are different
domains of audio signal processing, as RGB and YUV are in the video
realm, and doing conversions between these domains is not
interchangeable and not analogous to up/down-sampling within a single
domain.

AES is an encyrption standard, by the way...

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