Robust blind extracting audio watermarking based on quadrature Phase Shift Keying and Improved Spread Spectrum

Xiaoyun Liang, Yueyang Chen, Yueting Shi, Xiangnan Li, Ziwen Ma
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引用次数: 2

Abstract

In this paper, a robust blind extracting audio watermarking scheme based on Improved Spread Spectrum (ISS) and Quadrature Phase Shift Keying (QPSK) is proposed. The frequency of direct spread spectrum sequence signal is reduced to limit its bandwidth, and then modulated to a higher frequency band with QPSK so as to lower the influence of watermarking to listener, meanwhile improve signal-noise ratio (SNR). The amplitude of watermarking to be embedded is determined by the correlation of spread spectrum (SS) sequence and the high frequency part of host audio signal. Experimental results show that the proposed scheme is more robust and transparent than traditional ISS watermarking.
基于正交相移键控和改进扩频的音频水印鲁棒盲提取
提出了一种基于改进扩频(ISS)和正交相移键控(QPSK)的鲁棒盲提取音频水印方案。通过降低直接扩频序列信号的频率来限制其带宽,然后通过QPSK调制到更高的频段,从而降低水印对听者的影响,同时提高信噪比。要嵌入的水印的幅度由扩频序列与主机音频信号高频部分的相关性决定。实验结果表明,该方案比传统的ISS水印具有更强的鲁棒性和透明性。
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