[microsound] sonic watermarking - not what you think

[Aaron Ximm <ghede@xxxxxxxx>]

Not imbedding DRM info in "inaudible" frequencies -- even weirder:

'An audio watermarking scheme, developed at Philips' labs in the
Netherlands, uses cards made from a polymer with a carefully distributed
pattern of impurities buried inside. When the card is placed into a
reader, a miniature loudspeaker injects sound into the material and a
miniature microphone picks up the signal that comes out the other side.'

Full article: http://www.newscientist.com/article.ns?id=dn8458

Suggests a whole new field, sonic tomography, as a counterpart to
phonography. :)

 aaron

  ghede@xxxxxxxx
  http://www.quietamerican.org

  |  quod omne animal post   |
  |  cogitum est triste...   |


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