Self-Authentication of Audio Signals by Chirp Coding

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Provided by: Dublin Institute of Technology
Topic: Security
Format: PDF
In this paper, the authors discusses a new approach to 'Watermarking' digital signals using linear frequency modulated or 'Chirp' coding. The principles underlying this approach are based on the use of a matched filter to provide a reconstruction of a chirped code that is uniquely robust in the case of signals with very low signal-to-noise ratios. Chirp coding for authenticating data is generic in the sense that it can be used for a range of data types and applications (the authentication of speech and audio signals, for example). The theoretical and computational aspects of the matched filter and the properties of a chirp are revisited to provide the essential background to the method.
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