An audio digital watermarking algorithm based on wavelet for air channel

Using technology of wavelet decomposition and energy calculation, an audio digital watermarking algorithm was proposed. The proposed algorithm chooses mid-frequency wavelet coefficients to calculate the energy. Through the method of energy´s comparison and adjustment, the watermarking information and synchronization signal were embedded into the original audio carrier with large capacity. Experimental results indicate that the proposed algorithm has a good hidden effect and an excellent robustness. Furthermore, it can be applied into air-channel transmission situation with low bit error ratio.