| 摘要 |
<p num="1"><br/><br/><br/>Method of embedding a digital watermark in a useful signal, wherein a <br/>watermark bit sequence is embedded into the frequency domain of the useful <br/>signal using adaptive frequency modulation of two given frequencies by <br/>tracking amplitudes of the chosen frequencies of the original signal and <br/>modifying them according to the current bit of watermark bit sequence.<br/>
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