Audio watermarking for monitoring and copy protection
MULTIMEDIA '00 Proceedings of the 2000 ACM workshops on Multimedia
Robust Covert Communication over a Public Audio Channel Using Spread Spectrum
IHW '01 Proceedings of the 4th International Workshop on Information Hiding
Robust spread-spectrum audio watermarking
ICASSP '01 Proceedings of the Acoustics, Speech, and Signal Processing, 2001. on IEEE International Conference - Volume 03
An Audio Watermarking Technique That Is Robust Against Random Cropping
Computer Music Journal
Multiple Scrambling and Adaptive Synchronization for Audio Watermarking
IWDW '07 Proceedings of the 6th International Workshop on Digital Watermarking
Time-scale invariant audio watermarking based on the statistical features in time domain
IH'06 Proceedings of the 8th international conference on Information hiding
Statistical characteristic-based robust audio watermarking for resolving playback speed modification
Digital Signal Processing
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One of the problems for audio watermarks is robustness against signal processing causing de-synchronization of the pseudo-random sequences. To tackle the problem, we previously introduced an audio watermarking method using a two-dimensional pseudo-random array, which is robust against pitch shifting and random stretching to some extent. In this paper, we explain a modification to the detection algorithm to improve the robustness against excessive distortion. The method uses multiple pseudo-random arrays each of which is stretched assuming a certain amount of distortion. Since most of the detection process for the multiple arrays is shared, the additional computational cost is limited.