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    • 1. 发明申请
    • Method and apparatus for transmitting watermark data bits using a spread spectrum, and for regaining watermark data bits embedded in a spread spectrum
    • 用于使用扩展频谱发送水印数据位的方法和装置,以及用于恢复嵌入在扩展频谱中的水印数据位
    • US20070116324A1
    • 2007-05-24
    • US10582031
    • 2004-09-13
    • Peter BaumWalter Voessing
    • Peter BaumWalter Voessing
    • G06K9/00
    • H04H20/31G10L19/018G11B20/00891H04H2201/50
    • Spread spectrum technology and the related inserted or added information signal can be used for implementing watermarking digital audio signals. A known processing for retrieving at receiver or decoder side the watermark signal information bit from the spread spectrum is convolving the received or replayed spectrum with a spreading function that is time-inverse with respect to the original spreading function. The pseudo noise sequences are modulated one or more carrier frequencies which are inserted at one or more frequency bands into the spectrum of an audio signal. The watermark signal decoder checks the frequency bands occupied by such carriers. According to the invention, the frequency band occupation information is signalled in advance, i.e. is trans-mitted already together with the frame data for the current frame, such that the watermark signal decoder knows before processing the following audio signal frame which carrier frequency or frequencies are occupied and must be used for the corresponding carrier demodulation, and which carrier frequencies need not be checked and demodulated.
    • 扩展频谱技术和相关的插入或添加信息信号可用于实现水印数字音频信号。 在接收机或解码​​器侧检索来自扩频的水印信号信息比特的已知处理是用接收或重放的频谱与相对于原始扩展函数的时间反相的扩展函数进行卷积。 伪噪声序列被调制为在一个或多个频带插入到音频信号的频谱中的一个或多个载波频率。 水印信号解码器检查这些载波占据的频带。 根据本发明,提前发信号通知频带占用信息,即与当前帧的帧数据一起发送,使得水印信号解码器在处理以下音频信号帧之前知道哪个载波频率或频率 被占用,必须用于相应的载波解调,哪些载波频率不需要检查和解调。
    • 2. 发明申请
    • Method and apparatus for encoding symbols carrying payload data for watermarking an audio or video signal, and method and apparatus for decoding symbols carrying payload data of a watermarked audio or video signal
    • 用于编码携带用于对音频或视频信号进行加水印的有效载荷数据的符号的符号的方法和装置,以及用于解码承载带有水印的音频或视频信号的有效载荷数据的符号的方法和装置
    • US20060212710A1
    • 2006-09-21
    • US11376530
    • 2006-03-15
    • Peter BaumWalter Voessing
    • Peter BaumWalter Voessing
    • H04L9/00
    • G06T1/005G06T1/0028G06T2201/0065G06T2201/0202
    • Watermark information (denoted WM) consists of several symbols which are embedded continuously in an audio or a video signal. At decoder site the WM is regained using correlation of the received signal with an m-sequence if Spread Spectrum is used. In some watermark technology the watermark information is transmitted asynchronously, i.e. it is continuously tested whether or not WM can be embedded imperceptible within the audio or video signals. Only if this is true a WM frame is transmitted. But a WM frame consists of some tens of symbols, each carrying one or more bits which are transmitted synchronously. That means, if the period in which the WM can be embedded is shorter than the frame length, some symbols cannot be recovered at receiver side. According to the invention, each WM symbol carries an ID item in addition to its normal payload, and it is already tested in the encoder whether or not the signal is good enough so that the embedded symbol can be recovered at decoder side. If true, it is embedded. If not true, no WM is embedded for the length of one symbol and the test is repeated for the following symbol. The sequence of IDs is known at the encoder which can therefore detect using the ID whether or not a symbol has been skipped.
    • 水印信息(表示为WM)由连续嵌入音频或视频信号的几个符号组成。 在解码器位置,如果使用扩频,则使用接收信号与m序列的相关性来重新获得WM。 在一些水印技术中,水印信息是异步发送的,即连续测试WM是否可以在音频或视频信号内嵌入不可察觉的信号。 只有这样,才发送WM帧。 但是WM帧由几十个符号组成,每个符号携带一个或多个同步传输的位。 这意味着,如果可嵌入WM的周期短于帧长度,则在接收机侧无法恢复某些符号。 根据本发明,每个WM符号除了其正常有效载荷之外还携带ID项目,并且已经在编码器中测试了信号是否足够好,使得嵌入符号可以在解码器侧被恢复。 如果是,它是嵌入的。 如果不是真的,则不会为一个符号的长度嵌入WM,并为以下符号重复测试。 ID的序列在编码器处是已知的,因此可以使用ID来检测符号是否被跳过。
    • 3. 发明申请
    • Method and apparatus for transmitting watermark data bits using a spread spectrum, and for regaining watermark data bits embedded in a spread spectrum
    • 用于使用扩展频谱发送水印数据位的方法和装置,以及用于恢复嵌入在扩展频谱中的水印数据位
    • US20070136595A1
    • 2007-06-14
    • US10581771
    • 2004-09-13
    • Peter BaumWalter Voessing
    • Peter BaumWalter Voessing
    • H04L9/00
    • H04H20/31G10L19/018G11B20/00891H04H2201/50
    • Spread spectrum technology and the related inserted or added information signal can be used for implementing watermarking digital audio signals. A known processing for retrieving at receiver or decoder side the watermark signal information bit from the spread spectrum is convolving the received or replayed spectrum with a spreading function that is time-inverse with respect to the original spreading function. If BPSK modulation was used for applying the spread spectrum function, the output is a peak at the middle of the sequence of correlation values, the sign of such peak representing the value of the desired watermark signal information bit. According to the invention, in order to cope with echo distortions, two or more orthogonal spreading sequences are used at encoder side with the original or encoded audio signal in baseband. When applying the corresponding time-inverse orthogonal spreading sequences at decoder side, echoes that are longer than each one of spreading sequence's lengths can be fully removed. The spreading sequences applied can be modified at decoder side according to estimated echo delay values.
    • 扩展频谱技术和相关的插入或添加信息信号可用于实现水印数字音频信号。 在接收机或解码​​器侧检索来自扩频的水印信号信息比特的已知处理是用接收或重放的频谱与相对于原始扩展函数的时间反相的扩展函数进行卷积。 如果使用BPSK调制来应用扩频函数,则输出是相关值序列中间的峰值,这种峰值的符号表示所需水印信号信息位的值。 根据本发明,为了应对回波失真,在编码器侧使用原始或编码的音频信号在基带中的两个或更多个正交扩频序列。 当在解码器侧应用相应的时间 - 逆正交扩频序列时,可以完全去除比扩展序列长度中的每一个更长的回波。 可以根据估计的回波延迟值在解码器侧修改所应用的扩展序列。