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    • 1. 发明公开
    • Watermark signal provider and method for providing a watermark signal
    • Wasserzeichensignalversorger und Verfahren zur Bereitstellung eines Wasserzeichensignals
    • EP2362382A1
    • 2011-08-31
    • EP10154948.3
    • 2010-02-26
    • Fraunhofer-Gesellschaft zur Förderung der Angewandten Forschung e.V.
    • Wabnik, StefanGrill, BernhardEberlein, ErnstDel Galdo, GiovanniKrägeloh, StefanZitzmann, ReinhardBliem, TobiasBorsum, JulianeBreiling, MarcoPickel, JörgGreevenbosch, Bert
    • G10L19/00
    • G10L19/018
    • A watermark signal provider for providing a watermark signal in dependence on a time frequency-domain representation of watermark data, in which the time-frequency-domain representation comprises values associated to frequency subbands and bit intervals, the watermark signal provider comprises a time-frequency-domain waveform provider to provide time-domain waveforms for a plurality of frequency subbands, based on the time-frequency-domain representation of the watermark data. The time-frequency-domain waveform provider is configured to map a given value of the time-frequency-domain representation onto a bit shaping function. A temporal extension of the bit shaping function is longer than the bit interval associated to the given value of the time-frequency-domain representation, such that there is a temporal overlap between bit shaped functions provided for temporally subsequent values of the time-frequency-domain representation of the same frequency subband. A time-domain waveform of a given frequency subband contains a plurality of bit shaped functions provided for temporally subsequent values of the time-frequency-domain representation of the same frequency band. The water mark signal provider further comprises a time-domain waveform combiner, to combine the provided time-domain waveforms for the plurality of frequencies of the time-frequency-domain provider to derive the watermark signal.
    • 一种水印信号提供器,用于根据水印数据的时间频域表示提供水印信号,其中时间 - 频域表示包括与频率子带和比特间隔相关联的值,水印信号提供器包括时间频率 - 域波形提供器,以基于水印数据的时域表示来提供多个频率子带的时域波形。 时域波形提供器被配置为将时间 - 频域表示的给定值映射到位整形功能。 比特整形函数的时间扩展长于与时 - 频域表示的给定值相关联的比特间隔,使得在时间 - 频域 - 时域表示的时间上随后的值提供的比特形状函数之间存在时间重叠, 相同频率子带的域表示。 给定频率子带的时域波形包含为相同频带的时间 - 频域表示的时间上后续值提供的多个位形函数。 水印信号提供器还包括时域波形组合器,以组合提供的时频域提供者的多个频率的时域波形以导出水印信号。
    • 7. 发明公开
    • Watermark signal provision and watermark embedding
    • Wasserzeichensignalversorger und Wasserzeicheneinbettung
    • EP2362385A1
    • 2011-08-31
    • EP10154956.6
    • 2010-02-26
    • Fraunhofer-Gesellschaft zur Förderung der Angewandten Forschung e.V.
    • Wabnik, StefanGrill, BernhardEberlein, ErnstDel Galdo, GiovanniKrägeloh, StefanZitzmann, ReinhardBliem, TobiasBorsum, JulianeBreiling, MarcoPickel, JörgGreevenbosch, Bert
    • G10L19/00
    • G10L19/018H04H20/14H04H60/29H04H60/33
    • A watermark signal provider (2400) for providing a watermark signal (2440) suitable for being hidden in an audio signal (2430) when the watermark signal is added to the audio signal, such that the watermark signal represents watermark data (2450), is described. The watermark signal provider comprises a psychoacoustical processor (2410) for determining a masking threshold of the audio signal; and a modulator (2420) for generating the watermark signal from a superposition of sample-shaping functions spaced apart from each other at a sample time interval (T b ) of a time-discrete representation of the watermark data, each sample-shaping function being amplitude-weighted with a respective sample of the time-discrete representation, multiplied by a respective amplitude weight depending on the masking threshold, the modulator being configured such that the sample time interval is shorter than a time extension of the sample-shaping functions; and the respective amplitude weight also depends on samples of the time-discrete representation neighboring the respective sample in time.
    • 一种水印信号提供器(2400),用于当将水印信号添加到音频信号时提供适于隐藏在音频信号(2430)中的水印信号(2440),使得水印信号表示水印数据(2450),是 描述。 水印信号提供器包括用于确定音频信号的掩蔽阈值的心理声学处理器(2410) 以及调制器(2420),用于在水印数据的时间离散表示的采样时间间隔(T b)处从彼此间隔开的采样整形功能的叠加产生水印信号,每个采样整形功能是 用时间离散表示的相应样本进行幅度加权,乘以相应的根据掩蔽阈值的幅度权重,调制器被配置为使得采样时间间隔短于样本整形函数的时间延长; 并且相应的振幅权重也取决于在时间上与相应样本相邻的时间离散表示的样本。