A Robust Audio Watermarking in Cepstrum Domain Composed of Sample's Relation Dependent Embedding and Computationally Simple Extraction Phase

Watermark bits embedded in audio signals considering the sample’s relative state in a frame may\udstrengthen the attack-invariant features of audio watermarking algorithm. In this work, we propose to\udembed watermarks in an audio signal considering the relation between the mean values of consecutive\udgroups of samples which shows robustness by overcoming common watermarking challenges. Here, we\uddivide the host audio signal into equal-sized non-overlapping frames which in turn is split into four equalsized\udnon-overlapping sub-frames. After, transforming these sub-frames in cepstrum domain we finally use\udthe relation between the differences of first two sub-frames and last two sub-frames to embed watermarks.\udDepending on the watermark bit (either 0 or 1) to be embed, our embedding technique either interchange\udor update the differences between these groups of samples by distorting the sample values in sub-frames\udselectively. Thus, watermarks are embedded by making a little or no distortion of the sub-frames which\udhelps our scheme to be imperceptible in nature. Moreover, use of such embedding technique lead our\udwatermarking scheme to a computationally less complex extraction method. Simulation results also justify\udour claim of the proposed scheme to be both robust and imperceptible