计算机工程 ›› 2013, Vol. 39 ›› Issue (2): 137-140.doi: 10.3969/j.issn.1000-3428.2013.02.027

• 安全技术 • 上一篇    下一篇

一种基于基音预测的信息隐藏算法

刘程浩 1a,1b,柏 森 1a,1b,黄永峰 2,阳 溢 1a,1b,李松斌 2   

  1. (1. 重庆通信学院 a. 应急通信重庆市重点实验室;b. 图像通信实验室,重庆 400035; 2. 清华大学电子工程系,北京 100084)
  • 收稿日期:2012-03-30 修回日期:2012-05-18 出版日期:2013-02-15 发布日期:2013-02-13
  • 作者简介:刘程浩(1984-),男,硕士研究生,主研方向:信息隐藏,数字水印;柏 森,教授;黄永峰,副教授、博士生导师;阳 溢,硕士研究生;李松斌,博士
  • 基金项目:
    国家自然科学基金资助项目(60970148)

An Information Hiding Algorithm Based on Pitch Prediction

LIU Cheng-hao 1a,1b, BAI Sen 1a,1b, HUANG Yong-feng 2, YANG Yi 1a,1b, LI Song-bin 2   

  1. (1a. Chongqing Key Laboratory of Emergency Communication; 1b. Image Communication Laboratory, Chongqing Communication Institute, Chongqing 400035, China; 2. Department of Electronic Engineering, Tsinghua University, Beijing 100084, China)
  • Received:2012-03-30 Revised:2012-05-18 Online:2013-02-15 Published:2013-02-13

摘要: 针对低速率语音编码问题,提出一种基于基音预测的信息隐藏算法。在基音预测编码过程中,采用控制基音闭环搜索的自适应码本搜索范围方法,实现秘密信息的嵌入,在进行语音压缩的同时完成信息隐藏。实验结果证明,该算法具有良好的隐蔽性,且计算复杂度较低。在编码标准G.729a中,秘密比特信息嵌入速率统计平均最高可达374.636 bit/s,PESQ恶化改变率在10.4%以内,检测正确率在66%左右。

关键词: 信息隐藏, 低速率语音编码, 基音预测, VoIP协议, 基音周期, 长时预测

Abstract: Information hiding algorithm based on pitch prediction for low bit-rate speech coding is presented. In the pitch prediction coding process, the searching range of adaptive codebook in the closed-loop pitch search is used to realize the secret information embedding. Information hiding and speech coding are synchronously implemented. The algorithm not only has better steganography performance, but also has lower computational complexity. In G.729a, the statistical average embedding bit-rate of secret information is up to 374.636 bit/s, the deterioration of Perceptual Evaluation of Speech Quality(PESQ) is less than 10.4% and testing accuracy is less than 66%.

Key words: information hiding, low bit rate speech coding, pitch prediction, Voice over Internet Protocol(VoIP), pitch period, Long Time Prediction(LTP)

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