In article , Signal
wrote:
"Jim Lesurf" emitted :
I've also been interested by Oohashi's reports. However they strike me
as questionable news for SACD given the high amount of ultrasonic
'hash' that DSD tends to require. Haven't been able to decide if his
work is 'good news' or 'bad news' for SACD...
Interesting point Jim.
Have you heard SACD?
No, afraid not. So I can't make any comments on the sound quality as such.
However FWIW I have spent some time looking at the details of DSD/SACD, and
also have exchanged discussions with a couple of the people at Philips. I
do have some technical concerns about it which are slightly different to
those voiced by Lip****z and others, but may be related to them.
One problem is that the specific details of the 'ADC' (DSD modulator) which
Philips/Sony recommend/use are proprietary, yet I have found some 'quirks'
of the published examples. Since they refuse to publish the details of
their modulators I can't assess if they have the 'quirks' I have
encountered with openly published examples.[1]
I am inherently wary of systems that have proprietary and confidental
details which affect the behaviour. I also feel this is a problem in
information terms. You can only convert 'data' into 'information' if you
have complete and unabiguous information on how the data was produced.
I've been meaning to write an article on this for HFN sometime. However I
haven't yet been able to:
1) Get it into a form short and simple enough for magazine publication as
the 'background' to some of the things I found takes some explaining.
2) Satisfied myself that SACD won't just die - thus making 'techical'
articles on this about as relevant as one on Elcaset. :-)
For all I know, though, SACD may give excellent results in terms of audible
quality. All real systems have their limitations and snags.
[1] I may borrow a player for assessment sometime. However to do a proper
assessement of the points I have found I'd need to be able to create my own
SACDs as well as have some carefully specified ones from Philips/Sony. This
is rather problematic at present.
Slainte,
Jim
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