Abstract
the review presents a digital audio watermarking technique operating in the frequency domain with two variants. This technique uses the Modified Discrete Cosine Transform (MDCT) to move to the frequency domain. To ensure more inaudibility, we exploited the proprieties of the psychoacoustic model 1 (PMH1) of MPEG1 encoder layer I in the first variant and those of psychoacoustic model 2 (PMH2) of MPEG1 encoder Layer III in the second alternative to search the places for insertion of the watermark. In both variants of the technique, the bits of the mark will be duplicated to increase the capacity of insertion then inserted into the least significant bit (LSB). For more reliability in the detection phase, we use an error correction code (Hamming) on the mark. Next, to analyze the performance of the proposed technique, we perform two comparative studies. In the first, we compare the proposed digital audio watermarking technique with her two variants and those achieved by Luigi Rosa and Rolf Brigola, ‘which we download the M-files of each’. The technique developed by Luigi Rosa operates in the frequency domain but using the Discrete Cosine Transform (DCT) as transformation and that proposed by Rolf Brigola uses the Fast Fourier Transform (FFT). We studied the robustness of each technique against different types of attacks such as compression / decompression MP3, stirmark audio attack and we evaluated the inaudibility by using an objective approach by calculating the SNR and the ODG notes given by PEAQ. The robustness of this technique is shown against different types of attacks. In the second, we prove the contribution of the proposed technique by comparing the payload data, imperceptibility and robustness against attack MP3 with others existing techniques in the literature
Highlights
Internet development and more generally the new means of communication oriented Western society into an era where digital takes a place increasingly important: Gradually digital cameras supplanting the old chemical film, DVD players replace VCRs as the Compact Discs were able to do with the disc vinyl.digital copies are perfect whereas before each generation of analogical copies introduced further degradation
For after what we have presented above and after an extensive literature review [6, 3, 7, 8, 9, 10] led us to choose the frequency domain as an area of insertion of the mark point of view robustness and inaudibility the idea of using Modified Discrete Cosine Transform (MDCT) [19] to the time-frequency mapping [11, 3, 8]
3) Detection, Elimination of duplication, Hamming decoding: from the secret key, which is an array containing the positions of the components that are below the masking curve sought by the psychoacoustic model 1 in the insertion process, we can detect the bits of the brand inserted in the samples corresponding to these positions
Summary
Internet development and more generally the new means of communication oriented Western society into an era where digital takes a place increasingly important: Gradually digital cameras supplanting the old chemical film, DVD players replace VCRs as the Compact Discs were able to do with the disc vinyl. Robustness: Being robust is equivalent to finding the inserted mark regardless of the changes that may infect the watermarked object. These changes are due to several types of treatments (attacks), as the passage in an analog channel resampling (print / SCANNING eg for images) compression with loss of information (such as JPEG compression [2] for images or MP3 to sounds), nonlinear distortions, additive channel noise. Insertion capacity (Ratio): This characteristic is important; it is the quantity of information that can be inserted into the original message It is called the payload or capacity of watermarking. Too little perceptible mark is not robust and, worse, could be wrongly detected
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