Abstract: This paper proposes a digital secure speech secrete transmission scheme based on Audio-On-Demand(AOD) platform. G.729A coding algorithm is used for secure speech. The bitstream from coder is embedded into open audio files using an improved LSB algorithm, and is put out on the network. Then the client can play back the security speech from the system. Tests show that the quality of cover-audio is improved by the proposed algorithm and the scheme has better transparency to aimed attackers.

Key words: information hiding, speech coding, Audio-On-Demand(AOD)

摘要： 提出一种基于音频点播系统的保密语音隐秘传输实现方案。采用ITU G.729A编码算法对保密语音低码率压缩编码，将保密语音码流通过改进LSB数据隐藏算法嵌入到公开音频中，利用音频点播平台发布到网络上，通过客户端点播实现保密语音提取和回放。测试数据结果表明，通过改进算法，载体音频的感知质量得到了提高，同时也表明该方案对于恶意攻击者具有更好的隐蔽性。

关键词: 信息隐藏, 语音编码, 音频点播

CLC Number: 

• TP309