대한전자공학회:학술대회논문집 (Proceedings of the IEEK Conference)
- 대한전자공학회 2003년도 컴퓨터소사이어티 추계학술대회논문집
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- Pages.7-10
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- 2003
Modification of Polar Echo Kernel for Performance Improvement of Audio Watermarking
- Kim, Siho (School of Electronic & Electrical Engineering, Kyungpook National University) ;
- Hongseok Kwon (School of Electronic & Electrical Engineering, Kyungpook National University) ;
- Keunsung Bae (School of Electronic & Electrical Engineering, Kyungpook National University)
- 발행 : 2003.11.01
초록
In this paper, we present a new echo kernel, which is a modification of polar echo kernel. to improve the detection performance and robustness against attacks. Polar echo kernel may take advantage of large detection margin from the polarity of inserted echo signal, but its poor frequency response in low frequency band degrades sound quality. To solve this problem, we applied bipolar echo pulses to the polar echo kernel. Using the proposed echo kernel the distributions of autocepstrum peaks fur data ‘0’ and ‘1’ are located more distant and improvement of detection performance is achieved. It also makes the low frequency band flat so that the timbre difference in the polar echo kernel can be removed to reproduce the imperceptible sound qualify. Informal listening tests as well as robustness test against attacks were performed to evaluate the proposed echo kernel. Experimental results demonstrated the superiority of the proposed echo kernel to both conventional unipolar and polar echo kernels
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