Research of Improved Echo Data Hiding: Audio Watermarking Based on Reverberation

Reverberation is one of the most heavily used effects in music. A new watermarking method based on reverberation theory is proposed in this paper. The embed process same as the process that adds reverberation to recordings in music studio to make it sound quite natural like in a real concert hall. The watermark are embedded by convoluting the original audio signal and a room impulse response that obtained by image method. The parameters for calculating the room impulse response are used as secret key that must be used in the decoding process to ensure security. When decoding, homomorphic deconvolution method is used to separate the kernel function from the cepstrum of the watermarked audio signal, and then take cross-correlation with the delay sequence of room impulse response to get watermark by searching the peak.