共查询到19条相似文献,搜索用时 546 毫秒
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语音回声隐藏技术及分析 总被引:3,自引:0,他引:3
将信息隐藏技术用于实现语音安全通信,对语音安全通信的一种新方法——语音回声隐藏技术进行了分析和研究,给出了实现该技术的系统方案,并进行仿真和分析,从人耳听觉特性具体要求的角度具体讨论该系统的实现细节。 相似文献
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为了在不影响语音通信效果的前提下,在语音通信的同时实现传输有用的隐藏数据,提出了一种在发射端采用改进的回声隐藏算法嵌入隐藏数据,而在接收端采用倒谱算法检测原始语音信号和隐藏数据的方法,能够解决一般传输中可靠性差、误码率高的问题.最后构建了以Sun Spot为核心的硬件平台系统,借助Spot的无线传感器、ARM920T、CC2420无线通讯器件和创新的Squawk JAVA虚拟机,通过JAVA语言编程和嵌入技术实现语音信号的采集、隐藏数据的嵌入、混合信号的同步传输和信号的检测还原等功能.实验证明了改进回声算法的有效性和系统的可行性,该系统为工业应用提供参考. 相似文献
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In recent years, information hiding techniques have attracted increased attention owing to the growing demand for the ability
to exchange large amounts of information. In addition, hiding information in compressed messages is very practical in improving
transmission efficiency and saving large amounts of storage space. However, the damage caused by hiding data in compressed
messages reduces image quality more than the damage caused by hiding data in uncompressed messages. Hence, this paper proposes
a data hiding scheme based on side-match prediction and declustering techniques for vector quantization (VQ) compressed images.
The appropriate side-match prediction not only embeds secret information into the VQ index but also reverses the original
compressed index. In addition, the capacity for secret information can be varied adaptively depending on the requirements
of different applications. As experimental results indicate, the proposed scheme indeed outperforms previous work in hiding
capacity and in the image quality of stego-images. 相似文献
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文中利用椭圆曲线密码体制密钥短,安全性高的特点,并运用小波分析技术,将加密通信和信息隐藏相结合,提出基于椭圆曲线密码体制与小波分析的秘密信息隐藏方案。文中对方案各部分进行了详细介绍,并给出信息隐藏的效果图。 相似文献
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LPC parameters substitution for speech information hiding 总被引:1,自引:0,他引:1
Information hiding techniques adopted in secret communication should meet the requirements of high hiding capacity, real-time and high robustness. For the purpose of real-time speech secure communication, an information hiding algorithm based on the analysis-by-synthesis (ABS) speech coding scheme is presented in this article. This algorithm substitutes secret speech data bits for linear predictive coefficients (LPCs) in linear predictive coding (LPC). Statistics show that the change of voiced signal track is slow and the codebook for LPCs vector is large in ABS coding scheme. Therefore, a new concept, filter similarity, is proposed to determine the LPC parameters for substituting with secret speech information, and to generate multi-codebook for saving storage space to store secret speech information. To achieve the best effects of information hiding, a dynamic threshold is built to make an optimal trade-off among hiding-capacity, security, robustness, transparence and real time. Experiments show that the proposed approach meets the requirements of information hiding and secret communication speech quality. The test results indicate that this approach reaches high hiding capacity with an excellent speech quality and complicating speakers'recognition. 相似文献
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阐述了信息隐藏技术的基本原理、信息隐藏系统的一般模型和设计要求,分析了信息隐藏技术的两个主要分支——隐写术和数字水印对性能指标的不同要求,探讨了以数字图像作为载体的隐藏算法的实现方法,以及信息隐藏技术在通信保密和版权保护等方面的应用。 相似文献
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数字图像信息隐藏技术研究 总被引:2,自引:0,他引:2
阐述了信息隐藏的基本概念及其与信息加密的区别,给出了用数字图像作为掩护媒体的信息隐藏算法,为了提高信息隐藏的安全性,引入了混沌序列对秘密信息进行加密的方法,实验结果表明,算法很好的实现了信息隐藏功能。 相似文献
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Lossless data hiding can restore the original status of cover media after embedded secret data are extracted. In 2010, Wang et al. proposed a lossless data hiding scheme which hides secret data in vector quantization (VQ) indices, but the encoding strategies adopted by their scheme expand the final codestream. This paper designs four embedding and encoding strategies to improve Wang et al.'s scheme. The experiment result of the proposed scheme compared with that of the Wang et al.'s scheme reduces the bit rates of the final codestream by 4.6% and raises the payload by 1.09% on average. 相似文献