Development of Audio Watermark Technology to be Extracted Contactlessly by Cell Phone

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  • Modegi Toshio
    Media Technology Research Center, Dai Nippon Printing Co., Ltd.

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  • 携帯電話で非接触抽出可能な音楽電子透かし技術の開発
  • ケイタイ デンワ デ ヒセッショク チュウシュツ カノウ ナ オンガク デンシ スカシ ギジュツ ノ カイハツ

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We have proposed a novel audio watermarking technology, which embeds a set of bitstream data by changing two-channel stereo locations of lower frequency components in an embedding target audio signal. This method features nearly lossless embedding, robustness against lossy data compression or analogue conversion, and enables contactless asynchronous detection of embedded watermarks through speaker and microphone devices without the original audio signals.<br>Then, we propose several extended monaural embedding methods, which embed data by changing level balances between two sets of lower frequency components, which are divided by either frequency or temporal dimensions. In these level changes, we remove lower frequency components of the left channel signal and add the removed components to the corresponding components of the right channel of given stereo signal in order to support also nearly lossless embedding. These methods enable watermark detection from only the left channel signal by a single monaural microphone, and we have confirmed detection capability by a cell phone.<br>In this paper, we describe abstracts of our proposed watermark embedding and extracting algorithms, experimental results of watermark extraction precision.

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