Doping and witness watermarking for audio processing

Overview & Synopsis

In the last years the research in the field of digital watermarking evolved toward non conventional watermarking applications, which we refer to as watermark aided audio processing. In this paper, we present some of our contributions to this new concept of watermarking for audio processing, namely doping watermark and witness watermark. The doping watermarking modifies the statistical characteristics of signals in order to satisfy particular conditions of algorithms or systems: it may stationarize, gaussianize a signal or make its characteristic function bandlimited. We further show that a watermark can be used as a channel witness, to reproduce channel distortions and hence facilitates channel identification.