[11775] in cryptography@c2.net mail archive
Re: Real-world steganography
daemon@ATHENA.MIT.EDU (Jeremey Barrett)
Tue Oct 1 09:56:45 2002
Date: Mon, 30 Sep 2002 22:15:21 -0500
From: Jeremey Barrett <jeremey@rot26.com>
To: Paul Krumviede <pwk@acm.org>
Cc: Peter Gutmann <pgut001@cs.auckland.ac.nz>,
cryptography@wasabisystems.com, cypherpunks@lne.com
Paul Krumviede wrote:
| --On Tuesday, 01 October, 2002 13:54 +1200 Peter Gutmann
|
| maybe. i'm not sure how many players support it (my spectral D/A
| convertor does, but then some of the people at spectral seem to
| have invented HDCD). while the CDs i have that use it sound
| pretty good, i don't have any good way to compare them when
| played back over a non-HDCD capable convertor (i could hook
| up one of my computer CD drives, but that doesn't seem fair
| compared to the spectral transport-D/A combination).
|
The extra 4 bits add quite a bit, subjectively. I've compared the same
CD on the same system with an HDCD player and non-HDCD player.
| but when i do play such CDs on other gear, i don't notice any
| audible degradation, so it isn't obviously harmful.
|
| i've seen comments in reviews of professional CD mastering
| gear that there are other, seemingly preferred, technologies,
| although i've never found details of them.
|
The other formats of note are probably SACD and then DVD-Audio. SACD
is multichannel 16-bit/44.1kHz... so multichannel CD without additional
sample resolution (if I recall). SACD is not "backwards compatible"
though, whereas HDCD is.
DVD-Audio is really the way to go, though... 24-bit/96kHz multichannel
or up to 192kHz two-channel. Lots more bits, lots more samples. It makes
a huge difference on "pretty good or better" gear.
Regards,
Jeremey.
--
Jeremey Barrett [jeremey@rot26.com] Key: http://rot26.com/gpg.asc
GnuPG fingerprint: 716E C811 C6D9 2B31 685D 008F F715 EB88 52F6 3860
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