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公开(公告)号：EP1356598B1
公开(公告)日：2012-05-30
申请号：EP01273323.4
申请日：2001-12-18
发明人： BRUEKERS, Alphons, A., M., L. , HAITSMA, Jaap, A. , VAN DER VEEN, Minne , KALKER, Antonius, A., C., M.
IPC分类号： H03M13/47
摘要： The invention relates to a method of checking the correct operation of a signal transformation wherein an input signal is transformed into an output signal. The method comprises: deriving a first robust feature from the input signal; deriving a second robust feature from the output signal; comparing said first and second robust features; in case of sufficient similarity, concluding a correct operation of said signal transformation, and in case of insufficient similarity, concluding a false operation of said signal transformation. In a special embodiment, the method is applied wherein the first robust feature is embedded in the input signal through watermark technology, the thus obtained signal being transmitted to a receiver so as to retrieve an output signal corresponding to said input signal.
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公开(公告)号：EP1062732B1
公开(公告)日：2012-05-02
申请号：EP99965560.8
申请日：1999-12-24
CPC分类号： H03M7/00 , G10L19/008 , G10L19/04 , H03M7/30
摘要： For 'Super Audio CD' (SACD) the DSD signals are losslessly coded, using framing, prediction and entropy coding. Besides the efficiently encoded signals, a large number of parameters, i.e. the side-information, has to be stored on the SACD too. The side information comprises the prediction filter coefficients and the probability table which have been used for encoding, and which should be transmitted to the decoder. The smaller the storage capacity that is required for the side-information, the better the overall coding gain is. Therefore coding techniques are applied to the side-information too so as to compress the amount of data of the side information. The frames can be segmented, each segment having its own set of filter coefficients and probability table.
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公开(公告)号：EP2263226A1
公开(公告)日：2010-12-22
申请号：EP09727873.3
申请日：2009-03-24
发明人： ZHOU, Xiaoming , LEMMENS, Paul, M., C. , BRUEKERS, Alphons, A., M., L. , TOKMAKOFF, Andrew, A. , HART DE RUIJTER-BEKKER, Evelijne, M. , PRONK, Serverius, P., P.
IPC分类号： G09B11/00
CPC分类号： G09B11/00 , G06T13/205 , G06T13/40
摘要： The invention relates to a method for modifying a representation based upon a user instruction and a system for producing a modified representation by said method. Conventional drawing systems, such as pen and paper and writing tablets, require a reasonable degree of drawing skill which not all users possess. Additionally, these conventional systems produce static drawings. The method of the invention comprises receiving a representation from a first user, associating the representation with an input object classification, receiving an instruction from a second user, associating the instruction with an animation classification, determining a modification of the representation using the input object classification and the animation classification, and modifying the representation using the modification. When the first user provides a representation of something, for example a character in a story, it is identified to a certain degree by associating it with an object classification. In other words, the best possible match is determined. As the second user imagines a story involving the representation, dynamic elements of the story are exhibited in one or more communication forms such as writing, speech, gestures, facial expressions. By deriving an instruction from these signals, the representation may be modified, or animated, to illustrate the dynamic element in the story. This improves the feedback to the users, and increases the enjoyment of the users.
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公开(公告)号：EP1958374B1
公开(公告)日：2009-03-25
申请号：EP06831950.8
申请日：2006-11-27
IPC分类号： H04L9/32
CPC分类号： H04L9/3234 , H04L9/3278
摘要： The present invention relates to a method and a device (104) for authenticating a plurality of physical tokens (101, 102, 103). A basic idea of the invention is to supply a sequence of interconnected devices (108, 109, 110), each device comprising a physical token (101, 102, 103), with a challenge of the respective physical token created during enrollment of said respective physical token, wherein the sequence of interconnected devices is arranged such that a data set supplied to the sequence is cryptographically processed with a response of a token comprised in a device and passed on to a token comprised in a subsequent device which further cryptographically processes the processed data set with its response until a response of a final physical token has been used to further cryptographically process the data set. Then, the data set which has been cryptographically processed with the responses of the tokens in the sequence is received and used together with the data set itself and data associated with the response of the respective token to authenticate the sequence of physical tokens.
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公开(公告)号：EP1668632A1
公开(公告)日：2006-06-14
申请号：EP04769915.2
申请日：2004-09-01
CPC分类号： H04N1/32149 , G06T1/005 , G06T2201/0065 , G10L19/018 , H04N2201/3236 , H04N2201/328
摘要： The invention concerns a method and apparatus for embedding and detecting watermarks in a digital host signal. In the embedding method a watermark sequence of length Lw/N bits carrying predetermined information is generated and then up-sampled by a factor N (preferably N=2). At intermediate sampling points of the up-sampled sequence a modified version of the watermark sequence (in preferred arrangements the negative thereof) is inserted to form a compound watermark sequence of length Lw. The compound watermark sequence is then combined with the host signal to watermark the host signal. The invention finds particular advantage in that the need for a spectral whitening stage in the detector is done away with.
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公开(公告)号：EP1588352A1
公开(公告)日：2005-10-26
申请号：EP04701657.1
申请日：2004-01-13
CPC分类号： H04N19/467 , G10L19/018 , G11B20/00086
摘要： The invention relates to methods, devices, a system of devices and a signal where additional information is embedded in media content. The system includes a device (10) providing additional information (O, D) in a signal (y) having media content, comprising a first mapping unit (14) mapping the amplitude values of the media content onto first new values, and a multiplexing unit (16) inserting the additional information into the mapped media content. The system also includes a device (12) for receiving additional information (O, D) in a signal (y) having media content, comprising a demultiplexing unit (22) arranged to receive a signal including media content (xQ) the amplitude values of which have been mapped onto first new values together with additional embedded information (O, D), and remove the additional information from the mapped media content. The invention allows insertion of watermarks into media content such as audio.
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公开(公告)号：EP1466495A1
公开(公告)日：2004-10-13
申请号：EP02781631.3
申请日：2002-12-09
IPC分类号： H04Q9/00
CPC分类号： H04Q9/00
摘要： System for performing telemetric measurements, comprising a plurality of mobile communication devices (100), each communication device (100) being provided with at least one sensor (110) and a sensor control section (120) for performing measurements, a cellular communication network structure for the mobile communication devices, a server provided with communication means for receiving measurement data from the plurality of mobile communication devices (100), and for sending measurement instructions to respective sensor control sections (120) of the mobile communication devices (100) wherein the sensor control sections (120) are programmable by the server.
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公开(公告)号：EP1423914A2
公开(公告)日：2004-06-02
申请号：EP01984761.5
申请日：2001-11-22
IPC分类号： H03H1/00
CPC分类号： G11B20/00007 , G10L19/04
摘要： A filtering method is proposed wherein first several filtering steps (I-III,IV-VI) are made. Each step (I-III,IV-VI) includes: generating a filtered signal (I,IV), rounding this filtered signal (II,V) to a certain accuracy and combining (III,VI) the rounded signal with the input signal, whereby a filter error is obtained. The filtered signals are combined (VII) to a first filtered signal that is rounded (VIII) and combined (IX) with the input signal, whereby a coded signal is obtained. This allows to adapt the rounding step (II,V) and the combining step (III,VI) in each filtering step to the specific filter design. Thereby limit cycles are reduced, the first filtered signal is available for further processes and the rounding can be inverted in the reverse process. Further a filter method for the reverse process, filter devices (1,10) able to perform these methods and devices (20,30,40,50,60) containing such devices are provided.
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公开(公告)号：EP1359755A1
公开(公告)日：2003-11-05
申请号：EP03101752.8
申请日：1997-03-03
IPC分类号： H04N7/00
CPC分类号： H03M7/42
摘要： The invention relates to the coding of digital information signal blocks comprising representation symbols, such as sampled values, by means of an adaptive variable-length coding, such as Huffman coding. The JPEG Standard also utilizes adaptive Huffman coding but the coding in accordance with this standard is inefficient when a comparatively large number of Huffman coding tables are to be transmitted. According to the invention, in the case of a small number of representation symbols per information signal block, the probabilities of occurrence of each of the representation symbols are transmitted together with the variable-length-coded representation symbols, a similar (de)coding table being generated both in the encoder and in the decoder on the basis of said probabilities. In the case of a larger number of representation symbols per information signal block information about the number of code words of each length and/or the maximum code length in each series of variable-length-coded representation symbols is added to this series. By means of this information the decoder can unambiguously generate a coding table. The invention provides a substantial reduction of the number of bits required for specifying the Huffman code tables.
摘要翻译： 本发明涉及通过诸如霍夫曼编码之类的自适应可变长度编码的包括诸如采样值的表示符号的数字信息信号块的编码。 JPEG标准还使用自适应霍夫曼编码，但是当要发送相对大量的霍夫曼编码表时，根据该标准的编码是低效的。 根据本发明，在每个信息信号块具有少量表示符号的情况下，每个表示符号的出现概率与可变长度编码的表示符号一起发送，类似的（de）编码表 基于所述概率在编码器和解码器中同时生成。 在每个信息信号块的更多数量的表示符号的情况下，将关于每个长度的每个长度编码表示符号的每个系列中的每个长度的码字的数量和/或最大码长度添加到该系列中。 通过该信息，解码器可以明确地生成编码表。 本发明提供了用于指定霍夫曼码表所需的比特数量的显着减少。
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