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METHOD AND APPARATUS FOR WATERMARKING AN AUDIO OR VIDEO SIGNAL WITH WATERMARK DATA USING A SPREAD SPECTRUM

机译：利用扩展频谱用水印数据对音频或视频信号加水印的方法和装置

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摘要

Watermark information (denoted WM) consists of several symbols which are embedded continuously in an audio or a video signal using spread-spectrum. At decoder site the WM is regained using correlation of the received signal with an m-sequence. According to the invention, not only is the watermark made audio or video signal level dependent (PAS), but also the spreading sequence used for the watermark is made audio or video signal level dependent. This means that the same WM symbol is encoded by several different spreading sequences (NSS). The encoder tests (DEC), which one of these WM symbols or sequences can be retrieved best in a decoder, and embeds that selected spreading sequence WM in the audio or video signal to be watermarked. At decoder side all candidate WM spreading sequences are correlated with the received signal and the spreading sequence with the best match is chosen as the correct one.

机译：水印信息（表示为WM）由几个符号组成，这些符号使用扩频连续地嵌入音频或视频信号中。在解码器站点，使用接收信号与m序列的相关性重新获得WM。根据本发明，不仅使水印取决于音频或视频信号电平（PAS），而且使用于水印的扩展序列取决于音频或视频信号电平。这意味着相同的WM符号由几个不同的扩频序列（NSS）编码。编码器测试（DEC），可以在解码器中最好地检索到这些WM符号或序列中的哪一个，并将选择的扩展序列WM嵌入要加水印的音频或视频信号中。在解码器侧，将所有候选WM扩展序列与接收信号相关，并选择具有最佳匹配的扩展序列作为正确的扩展序列。

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公开/公告号IN2007DN08755A

专利类型
公开/公告日2008-06-27

原文格式PDF
申请/专利权人
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申请/专利号IN8755/DELNP/2007
发明设计人 PETER GEORG BAUM;WALTER VOESSING;
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申请日2007-11-14
分类号G10L19/00;
国家 IN
入库时间 2022-08-21 20:07:36

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