| An Approach to Hide Secret Speech Information |
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| 作者姓名： | 吴志军 段海新 李星 |
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| 作者单位： | Network Research Center Tsinghua Univ. Beijing 100084 China，Tianjin Key Lab. for Advanced Signal Processing Civil Aviation Univ. of China Tianjin 300300，Network Research Center Tsinghua Univ. Beijing 100084 China，Network Research Center Tsinghua Univ. Beijing 100084 China |
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| 基金项目： | NationalNaturalScienceFoundationofChina(Nos.60203004,6027209),NationalBasicResearchProgramofChina(973Program)(No.2003CB314805),ChinaPost-doctoriaResearchFoundation(No.2005037060),andResearchStart-upFoudationofCAUC(No.05QD11Q) |
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| 摘 要： | Introduction Informationhidingasacommunicationprob-lem1]canbeadoptedtoprotectthesecurityofme-dia(signal)andchannelofcommunication.Media securityisrelativetocopyrightprotectionofdigital media,i.e.watermarking.Channelsecurityasso-ciateswithsecurecommunication.Mostresearch todaylayparticularstressontheformer,whilelit-tleattentionispaidtothelatter.Thispaperisfo-cusedonthesecurityofcommunicationchannel,proposesanapproachofreal-timespeechsecure communicationbasedonthetechniqueinformation hiding.Th…
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| 关 键 词： | 隐藏方法 信息 分析 合成 预报 |
| 文章编号： | 1007-1172（2006）02-0134-06 |
| 收稿时间： | 2005-10-10 |
An Approach to Hide Secret Speech Information |
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| WU Zhi-jun,DUAN Hai-xin,LI Xing.An Approach to Hide Secret Speech Information[J].Journal of Shanghai Jiaotong university,2006,11(2):134-139. |
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| Authors: | WU Zhi-jun DUAN Hai-xin LI Xing |
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| Abstract: | This paper presented an approach to hide secret speech information in code excited linear prediction (CELP)-based speech coding scheme by adopting the analysis-by-synthesis (ABS)-based algorithm of speech information hiding and extracting for the purpose of secure speech communication. The secret speech is coded in 2.4 Kb/s mixed excitation linear prediction (MELP), which is embedded in CELP type public speech. The ABS algorithm adopts speech synthesizer in speech coder. Speech embedding and coding are synchronous, i.e. a fusion of speech information data of public and secret. The experiment of embedding 2.4 Kb/s MELP secret speech in G.728 scheme coded public speech transmitted via public switched telephone network (PSTN) shows that the proposed approach satisfies the requirements of information hiding, meets the secure communication speech quality constraints, and achieves high hiding capacity of average 3.2 Kb/s with an excellent speech quality and complicating speakers' recognition. |
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| Keywords: | information hiding analysis-by-synthesis (ABS) code excited linear prediction(CELP) embed extract |
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