On Sun, 17 Apr 2005 00:59:32 +0200, François Yves Le Gal
wrote:

On Sat, 16 Apr 2005 17:32:42 -0400, "Arny Krueger" wrote:

Which is a posting of Audio Engineering Society Convention Paper 5395:

It's a preprint, not a paper.

BTW, it's a deeply revised version, correcting the numerous errors of
preprint 5188 presented at AES 109 (August 2000), which should never have
been accepted IMO.

As I recall, AES discussions of this topic caused Sony to eventually
admit that their professional SACD encoders don't actually use DSD to
directly digitize analog signals for recording purposes.

You don't recall correctly: DSD Wide was already widely deployed and well
known in pro circles since 1999 or so. DSD Wide *is* DSD.

Please stop this continued *lying* about DSD Wide.

DSD Wide is a 64x oversampled 8-bit system, functionally identical to
PCM as implemented by dCS and others. The *whole* of DSD's claimed
technical advantage was rooted in it being *single bit*. Since DSD
Wide is *not* single-bit, then it shows *no* technical advantage over
conventional PCM. Indeed, it's more accurately described as PCM
Narrow, not DSD Wide.

That's one of the reasons why Lip****z and Vanderkooy rewrote their
presentation. They had stated in 5188 that: "In contrast [to DSD] multibit
sigma-delta converters, which output linear PCM code (here, multibit refers
to five or so bits in the converter), are in principle infinitely
perfectible". DSD Wide is an 8-bit form of sigma-delta.

Exactly - and therefore *nothing* to do with DSD proper, whatever the
marketing jerks decided to call it. The adoption of DSD Wide in the
recording chain completely destroys Sony's claims for SACD.

BTW, Thorpe, Bental et al. presented "DSD-Wide. A Practical Implementation
for Professional Audio" at the same AES 110, preprint 5377. While Nuijten
and Reefman refuted most of Lip****z and Vanderkooy's remaining arguments in
"Why Direct Stream Digital (DSD) is the best choice as a digital audio
format", 5396, where they showed that "1-bit DSD signals can be dithered
properly, so the resulting dithered DSD stream does not contain audible
artifacts in a band from 0-100~kHz".

OK, proper dither isn't perfect dither, but DSD works.

Which is why Sony stopped using it? BWAHAHAHAHA!
--

Stewart Pinkerton | Music is Art - Audio is Engineering