Audio watermarking: a way to stationnarize audio signals
Audio watermarking: a way to stationnarize audio signals
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DOI：
10.1109/tsp.2004.839899(410)53
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发表时间：
2005-02
影响因子：
5.4
通讯作者：
S. Larbi;Mériem Jaïdane
中科院分区：
文献类型：
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作者：
S. Larbi;Mériem Jaïdane
音频水印通常被用作多媒体版权保护工具或作为在音频信号中嵌入元数据的系统。在本文中，水印被视为进一步的音频处理系统的预处理步骤：水印信号不传递任何信息，而是用于修改音频信号的统计特性，特别是其非平稳性。然后添加嵌入的水印，以使宿主信号平稳化。实际上，嵌入的水印是分段平稳的，因此它修改了原始音频信号的平稳性。在某些音频处理领域，这一事实可用于改善对时变信号统计非常敏感的性能。本文分析了感知水印对音频信号平稳性的影响。这项研究是基于平稳性指数，它代表了信号的频谱特性的变化，使用时间-频率表示的措施。仿真结果与两种信号，人工信号和音频信号（语音和音乐），提出。水印和原始音频信号之间的平稳性指标的比较显示了显着的平稳性增强的水印信号，特别是瞬态攻击。
Audio watermarking is usually used as a multimedia copyright protection tool or as a system that embed metadata in audio signals. In this paper, watermarking is viewed as a preprocessing step for further audio processing systems: the watermark signal conveys no information, rather it is used to modify the statistical characteristics of an audio signal, in particular its nonstationarity. The embedded watermark is then added in order to stationnarize the host signal. Indeed, the embedded watermark is piecewise stationary, thus it modifies the stationarity of the original audio signal. In some audio processing fields, this fact can be used to improve performances that are very sensitive to time-variant signal statistics. This work presents an analysis of the perceptual watermarking impact on the stationarity of audio signals. The study is based on stationarity indices, which represent a measure of variations in spectral characteristics of signals, using time-frequency representations. Simulation results with two kinds of signals, artificial signals and audio signals (speech and music), are presented. Stationarity indices comparison between watermarked and original audio signals shows a significant stationarity enhancement of the watermarked signal, especially for transient attacks.