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.