Time Base Modulation: a New Method of Watermarking Audio and Images 

This page contains unmolested and watermarked data as described in the accompanying paper.  

Below are sound and image files that have been very slightly altered to encode small amounts of information. Each sound file is 10 seconds long and they have been randomly ordered. Can you determine any differences between them?  Click here to hide which files were watermarked.

watermarked Mozart A watermarked
original Mozart B original
original Beatles A original
watermarked Beatles B watermarked
watermarked Beatles C watermarked
original Raiders A original
watermarked Raiders B watermarked

Reasons why this use of other people's music doesn't constitute copyright infringement.

I've used a similar technique to encode some information in the following picture. Can you tell which is modified and which is the original? Again, click here to hide the original and the watermarked indications.


Lena A

original

 Lena A

watermarked



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