In article , Glenn
Richards wrote:
Eiron wrote:

Someone has managed to reverse-engineer HDCD encoding:
http://www.srcf.ucam.org/~cjk32/hdcd

Yup, saw this - decent guy that wrote it, also sent me the source code
so I could build it on NetBSD (which I use for ripping). Compiled
cleanly and works great.

I've not yet checked the above URL. Does what you say mean the source code
isn't at that location? If I wanted to experiment, I'd also have to
recompile for the OS I use, so would need the source. Is it plain ANSI 'C',
or what?

Slainte,

Jim

--
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"Eiron" wrote in message
...

hdcd -o newtrack.wav track1.wav


IT WORKS!

Thanks for all your help.

I've tried it out on the only HDCD disc in my collection, a "Best of Dire
Straights" CD. I've yet to find a track where the dynamic range after
decoding is any greater than that straight from the disc. I haven't decoded
then all yet but, to be honest, I'm not expecting the other tracks to be any
different. All that the decoder does is to drop the level by around 3dB. So
what was the point of making this an HDCD disc, or is it all just marketing?

David.

Jim Lesurf wrote:
In article , Glenn
Richards wrote:

Eiron wrote:


Someone has managed to reverse-engineer HDCD encoding:
http://www.srcf.ucam.org/~cjk32/hdcd


Yup, saw this - decent guy that wrote it, also sent me the source code
so I could build it on NetBSD (which I use for ripping). Compiled
cleanly and works great.


I've not yet checked the above URL. Does what you say mean the source code
isn't at that location? If I wanted to experiment, I'd also have to
recompile for the OS I use, so would need the source. Is it plain ANSI 'C',
or what?

Slainte,

Jim


Yes, I was trying to find some source for this. Has anyone found any?

Given that I am messing with CPLDs to manipulate the i2s stream into dac
chips at the moment (not sure how I got there from building stuff with
triodes), it would be interesting to see if it could be translated into
VHDL.

--
Nick

"David Looser" wrote in
message
"Eiron" wrote in message
...

hdcd -o newtrack.wav track1.wav

IT WORKS!

Thanks for all your help.

I've tried it out on the only HDCD disc in my collection,
a "Best of Dire Straights" CD. I've yet to find a track
where the dynamic range after decoding is any greater
than that straight from the disc.

This is 100% in accordance with investigations by many others. There remains
no evidence of a commercial recording in any format that cannot be properly
coded and decoded from the standard CD format. The CD format is not a
practical limit to the dynamic range of real-world musical recordings. Such
practical limitations to musical dynamic range as do exist, are due to other
areas of the production chain than the CD audio delivery format.

I haven't decoded then
all yet but, to be honest, I'm not expecting the other
tracks to be any different. All that the decoder does is
to drop the level by around 3dB. So what was the point of
making this an HDCD disc, or is it all just marketing?

It was all marketing hype all along.

One significant differences is that the marketing hype extended into the
pages of the JAES. There is at least one JAES article allegedly proving the
existence of practical benefits for the HDCD format.