A subband excitation substitute based scheme for narrowband speech watermarking

Wei LIU; Ai-qun HU

doi:10.1631/FITEE.1601503

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A subband excitation substitute based scheme for narrowband speech watermarking

Regular Papers | Updated：2022-05-19

- A subband excitation substitute based scheme for narrowband speech watermarking
- 一种基于子带激励替换的窄带语音水印算法
- Frontiers of Information Technology & Electronic Engineering Vol. 18, Issue 5, Pages: 627-643(2017)
- Affiliations：
  
  School of Information Science and Engineering, Southeast University, Nanjing 210096, China
- Author bio：
  
  E-mail:weiliu@seu.edu.cn
  E-mail:aqhu@seu.edu.cn
- Funds：
- DOI：10.1631/FITEE.1601503
  CLC： TP309.2
- Received：26 August 2016，
  
  Accepted：03 March 2016，
  
  Published：2017-05
- Accepted：
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Wei LIU, Ai-qun HU. A subband excitation substitute based scheme for narrowband speech watermarking[J]. Frontiers of Information Technology & Electronic Engineering, 2017, 18(5): 627-643.
DOI：

Wei LIU, Ai-qun HU. A subband excitation substitute based scheme for narrowband speech watermarking[J]. Frontiers of Information Technology & Electronic Engineering, 2017, 18(5): 627-643. DOI： 10.1631/FITEE.1601503.

摘要

本文建议了一种新的窄带语音水印算法，该算法将部分语音信号替换为一个经过幅度调节和频谱成形的隐蔽信号。文中从理论上证明了若仅对一小部分载体语音作修改，则不但可以建立一个用于隐蔽通信的理想信道模型，而且还能确保隐藏信号的不可感知性和带水印信号的可懂度。在此基础上，文中建议了一个实际的系统模型。在嵌入器中，使用了能量规范化准则，使得通带水印信号的能量与原始通带语音激励信号的能量相等，然后使用合成滤波器来对该水印信号进行频谱成形。在提取器中，先用带通滤波器去除带外信号，然后用分析滤波器对失真进行补偿。实验结果显示，本文建议算法的数据速率可达400 bits/s，具有更佳的带宽效率，且有良好的不可感知性。此外，该算法对实际应用中的各种攻击也是顽健的。

Abstract

We propose a new narrowband speech watermarking scheme by replacing part of the speech with a scaled and spectrally shaped hidden signal. Theoretically

it is proved that if a small amount of host speech is modified

then not only an ideal channel model for hidden communication can be established

but also high imperceptibility and good intelligibility can be achieved. Furthermore

a practical system implementation is proposed. At the embedder

the power normalization criterion is first imposed on a passband watermark signal by forcing its power level to be the same as the original passband excitation of the cover speech

and a synthesis filter is then used to spectrally shape the scaled watermark signal. At the extractor

a bandpass filter is first used to get rid of the out-of-band signal

and an analysis filter is then employed to compensate for the distortion introduced by the synthesis filter. Experimental results show that the data rate is as high as 400 bits/s with better bandwidth efficiency

and good imperceptibility is achieved. Moreover

this method is robust against various attacks existing in real applications.

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references

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