适用于广播信道的时频调制音频隐藏算法

广播信道中包含大量音频信息,给音频信息隐藏应用提供了广阔空间,但在广播信道上缺乏行之有效的音频隐藏算法.针对上述问题提出了一种时频调制音频信息隐藏算法,时频调制技术具有较强的抗信道干扰特性,在广播信道上具有很强的适用性.该算法在音频载体中嵌入一定幅度的时频调制信息序列,用时频调制信息序列在不同时隙和频点的排列组合来表示秘密信息,通过控制时频调制信息序列的幅度将秘密信息隐藏到载体音频中,不被人耳所察觉.实验结果表明,该算法可应用在不同的调频FM广播信道上,并可保持96%以上的信息恢复率.

Audio information hiding algorithm based on Time-Frequency modulation method applied in broadcast channel

A lot of audio information is contained in Broadcast channel, which provides a broad space for information hiding application, but effective audio hiding algorithm rarely shows up. In view of the above problems, a kind of Time-Frequency modulated audio information hiding algorithm is put forward. Time-Frequency modulation technology possesses strong interference-robusted characteristics, which results in its strong applicability in the broadcast channel. In the algorithm, certain range of Time-Frequency modulation information sequence is embedded in the audio carrier, secret information is represented by the permutation and combination of different time slots and frequency points of the Time-Frequency modulation information sequence. By controlling the amplitude of the Time-Frequency modulation information sequence, the secret information is hidden into the audio carrier, which is not detected by the human ear. The experimental results show that the proposed algorithm can be applied to different FM broadcast channels, and can maintain the information recovery rate of over 96%.