In order to protect audio files, we propose in this paper a new integration scheme for blind audio file watermarking. The goal is to find a compromise between capacity and imperceptibility in order to hide as much data as possible while minimizing file degradation. This integration scheme is implemented in the three insertion domains: spatial, frequency and multi-resolution domains. For the spatial-domain integration, the mark is inserted directly into the data samples. For the frequency-domain integration, a Discrete Cosine Transform is applied to the audio frames; after the thresholding and quantification step, the watermark is inserted into the Discrete Cosine Transform coefficients to obtain the watermarked file. For the multi-resolution-domain insertion, a single-level Discrete Wavelet Transform is applied using the scaling low-pass filter and wavelet high-pass filter. The watermark integration is then performed using the obtained AC coefficients. The proposed concealment process combines three values to integrate two bits and only one may be modified, which reduces the probability of change unlike other approaches. This implies less modification and therefore less distortion of the host file; this explains the good Signal-to-Noise Ratio obtained of more than 59dB for the spatial-domain integration and therefore a reasonable imperceptibility. An evaluation of the watermark’s robustness demonstrates that the proposed schemes generate reasonably robust watermarked samples against various attacks with a high-quality watermark with normalized cross-correlation greater than 0.9 for the three insertion domains.

中文翻译：

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音频文件保护的空间和频率方法

为了保护音频文件，我们在本文中提出了一种新的盲音频文件水印集成方案。目标是在容量和不可感知性之间找到折衷方案，以便在尽可能减少文件退化的同时隐藏尽可能多的数据。这种集成方案在三个插入域中实现：空间域、频率域和多分辨率域。对于空间域集成，标记直接插入到数据样本中。对于频域集成，对音频帧应用离散余弦变换；在阈值化和量化步骤之后，将水印插入离散余弦变换系数中以获得水印文件。对于多分辨率域插入，使用缩放低通滤波器和小波高通滤波器应用单级离散小波变换。然后使用获得的 AC 系数执行水印积分。所提出的隐藏过程结合三个值来整合两个位，并且只能修改一个，这与其他方法不同，这降低了更改的概率。这意味着更少的修改，因此对主机文件的失真更少；这解释了获得超过 59 的良好信噪比 这意味着更少的修改，因此对主机文件的失真更少；这解释了获得超过 59 的良好信噪比 这意味着更少的修改，因此对主机文件的失真更少；这解释了获得超过 59 的良好信噪比dB 用于空间域集成，因此具有合理的不可感知性。对水印鲁棒性的评估表明，所提出的方案针对各种攻击生成了相当鲁棒的水印样本，具有高质量水印，三个插入域的归一化互相关大于 0.9。