An air channel digital audio watermarking algorithm based on DCT domain

This article put forward a robust digital audio watermarking algorithm oriented air channel based on DCT transformation, innovatively introducing Barker code as synchronization code sequence and completing the watermark embedding through quantitatively modifying DCT coefficients of adjacently low-frequency bands. This algorithm based on adjacent frequency band energy ratio, can specifically resist the phenomenon of energy attenuation in airborne transmission and effectively counteract background noise and echo interference in air channel; also it has great robustness, especially to random attacks shear, cropping MP3 compression attacks and conventional signal processing attacks. Meanwhile the watermark detection does not require the original audio which achieves blind watermarking extraction. Experimental results show that the proposed algorithm has acoustically good imperceptibility, relatively large embedding capacity and robustness in terms of air channel.