Real-world steganography

[Paul Krumviede]

--On Tuesday, 01 October, 2002 13:54 +1200 Peter Gutmann 
<pgut001 at cs.auckland.ac.nz> wrote:

> I recently came across a real-world use of steganography which hides extra
> data in the LSB of CD audio tracks to allow (according to the vendor) the
> equivalent of 20-bit samples instead of 16-bit and assorted other
> features. According to the vendors, "HDCD has been used in the recording
> of more than 5,000 CD titles, which include more than 250 Billboard Top
> 200 recordings and more than 175 GRAMMY nominations", so it's already
> fairly widely deployed.

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).

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.

-paul


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