Two-channel time-frequency audio watermarking
Hertanto, Richard Nathaniel
Foo, Say Wei
Date of Issue2007
IEEE International Conference on Information, Communications and Signal Processing (6th : 2007 : Singapore)
School of Electrical and Electronic Engineering
The time-frequency audio watermarking scheme  operates by removing and adding samples to the frequency spectrum of the audio signals (compression-expansion) as a way to embed watermarks. The watermarks so embedded are identified by comparing the waveforms of the original and the watermarked signals. For a single channel signal, the compression-expansion represents one binary symbol and the unchanged frames in between are taken as the other binary symbol. For audio signals with two channels such as stereo music, a method is proposed in this paper so that compressionexpansion in the two channels are used to represent different binary symbols In addition, some modifications to the original scheme  are also presented.
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