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%.
