Abstract: This paper proposes a kind of speech hiding algorithm based on wavelet transform.It embeds a speech as the secret message into a digital audio signal in order to transmit secret message under the camouflage of the audio signal or protect the audio product by using the speech signature as a mark.The method described in this paper makes use of the Human Auditory System（HAS） characteristics and the wavelet to compress the speech signature，so it increases the capacity.A proper parameter and some wavelet coefficients of the cover audio signal are selected to embed information.The experimental results show that the algorithm can hide high capacity of date imperceptibly and it is robust to routine operations on digital signal.

Key words: information hiding, wavelet transform, embedded quantity

摘要： 提出了一种基于小波变换的语音隐藏方法，把一段语音作为秘密信息嵌入一段数字音频信号中，其目的是用音频信号作伪装来传递秘密的语音信息或把语音信息作为一种标记来保护音频作品。这种方法根据人类听觉系统的特点，利用小波对语音信号进行压缩，增加了数据的嵌入量。载体音频信号小波变换后，选择部分小波系数用适当的嵌入参数嵌入信息。实验表明该算法的隐蔽性好，隐藏的数据量大，对常见的信号处理操作具有较强的稳健性，符合掩蔽通信的要求。

关键词: 信息隐藏, 小波变换, 嵌入量