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High Quality Audio Watermarking using Spread Spectrum and Psychoacoustic Model  

Noh Jin-Soo (Dept. of Electronic Engineering, Chosun University)
Rhee Kang-Hyeon (Dept. of Electronic Engineering, Chosun University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea CI / v.43, no.5, 2006 , pp. 48-56 More about this Journal
Abstract
In this paper, we proposed the high quality audio watermarking algorithm using MDCT/IMDCT (Modified DCT/Inverse Modified DCT) with psychoacoustic model. Generally, a digital audio watermark is embedding the frequency domain after frequency transform of the digital audio data but the digital audio quality is affected by watermarking. In our scheme, the digital audio data is spread with PN((Pseudo Noise) code and then audio watermark is embedded in MDCT processing that refers psychoacoustic model. In MDCT processing, according to the shape of filter bank output, the block switching selects a window sequence that has 256, 1,024 or 2,048 points interval for high quality audio. The author confirm that when watermark weight ${\alpha}$ is 2.5 below, the detection ratio of watermark is a satisfied to SDMI's(Secure Digital Music Initiative) recommendation 50% above and SM is $50{\sim}68dB$ range with mainly 4 kind of attacks(Compression, Cropping, FFT and Echo).
Keywords
Audio Watermarking; Psychoacoustic Model; MDCT; IMDCT;
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