April 12, 2009
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Description of EYM-Audio-Watermark 1.1.0
Watermark utility for WAV files
The EyM Audio Watermarking tools are shareware utilities that are offered "as is". They embed (resp. retrieve) a short data payload within (resp. from) 16-bit PCM audio wav files. The resulting watermarks have been shown to survive MP3 compression, down-sampling and even acoustic coupling (i.e. traveling through the air between a speaker and a microphone) without leading to noticeable degradation of the audio content.
Some people may qualify this approach as a blind watermark in the sense that it does not require access to the original audio content in order to retrieve the watermark payload.
These applications are free to try. In their demo mode, they should offer enough flexibility to perform a variety of performance tests so that you may assess whether or not they will work for your application before purchasing any license.
This shareware is intended to target small to medium size applications that may require an audio watermark. Although proof of ownership, tracking and copy deterrence might be the most popular applications of digital watermarks this shareware provides complete control over the nature of the data you might decide to embed in an audio recording. From the utilities point of view your payload is just a series of byte values.
This audio watermarking system is based on Spread Spectrum signaling techniques, a communication concept that has been widely used throughout at least three decades. Its application to embedding data within multimedia content can be traced back to academic papers published in the early 90s.
Maybe you have a confined watermarking application that doesn't justify the licensing cost of a sophisticated commercial system. Maybe your idea is at an early design stage and you wish to build a prototype or a proof of concept with minimal upfront investment. Maybe your application is so far off the beaten path that no audio watermark provider will give you the time of day. In any of these cases, a simple shareware solution might just be what you need.
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