[microsound] ::: The AntiPiracy Remix :::

[TeZ <tez@xxxxxxxxxxxxxxxx>]

http://www.newscientist.com/article.ns?id=mg18524897.100

The AntiPiracy Remix

How would you react if the voice of a record-company boss boomed through 
your speakers and berated you for pirating music? You may find out, if 
the music industry decides to adopt an invention by Mark Bocko and 
Zeljko Ignjatovic of New York city.

With help from the US Air Force Research Laboratory, the inventors found 
they could bury around 20 kilobits of speech data in a song without 
affecting how it sounds (US patent application 2005/0033579). Their 
technique exploits the fact that the tones of a musical instrument are 
made up of a complex pattern of randomly phased harmonics.
By forcing a few of these harmonics to move in and out of phase with a 
chosen reference, they can be made to convey a digital message. These 
phase shifts are so small they are imperceptible to the ear. But a 
software decoder, which could be built into MP3 players or file-sharing 
applications, detects the phase shifts and turns them into speech.

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I find it incredible!
:::TeZ:::



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