Abstract: This invention relates to a device and a method of generating a first and a second fingerprint (102,104) usable for synchronization of at least two signals (101,103) and corresponding method and device for synchronizing two or more signals. A fingerprint pair is generated on the basis of a segment of a first signal e.g. an audio signal and of a segment of a second signal e.g. a video signal at each synchronization time point. The generated fingerprint pair(s) are stored in a database (203) and communicated or distributed to a synchronization device (303). During synchronization, fingerprint(s) of the audio signal and fingerprint(s) of the video signal to be synchronized are generated and matched against fingerprints in the database. When a match is found, the fingerprints also determine the synchronization time point, which is used to synchronize the two signals. In this way, a simple, reliable and efficient way of synchronizing at least two signals is obtained.

Abstract: The invention relates to a system and method for updating a neighbour cell list of a wireless access node. User terminals to be to be transferred from a first wireless access node of a first wireless access network to a second wireless access node of a second wireless access network are detected. From the first wireless access node, one or more of the detected user terminals are requested to report cell information of a plurality of wireless access nodes of at least one of the first wireless access network and the second wireless access network. The cell information is received from the one or more of the detected user terminals and at least one of the first neighbour cell list and the second neighbour cell list is updated using the received cell information.

Abstract: The invention relates to cooperation between first and second wireless access networks that can be used to obtain energy reduction for or traffic routing within the overall telecommunications infrastructure while still enabling acceptable network coverage and satisfactory performance by the telecommunications infrastructure as a whole. The cooperation refers to the fact that the wireless access networks provide duplicate coverage in a particular area when both wireless access networks are active, and that traffic can be switched between the cooperating networks in order to temporarily adjust (e.g. switch off) resources of one or the wireless access networks. In this manner, energy reduction and/or traffic routing can be obtained under the constraint that sufficient service coverage and capacity remains at an acceptable quality.

Abstract: The invention relates to a method for use in a packet-switched communication system, the method comprising: sending a first packet from a source node to a destination node, the first packet containing a first set of data bits; sending a second packet from the source node to the destination node, the second packet containing a second set of data bits; wherein, in the event that the first set of data bits cannot be successfully decoded in the destination node, the second packet further comprises a first set of error correction bits for the first set of data bits.

Abstract: A device is configured to perform a method that detects a trigger marker for an action corresponding to a segment of a multimedia signal. A fingerprint is generated based on the segment of the multimedia signal at a trigger time point. The generated fingerprint is stored in a database and communicated to the device. During playback of the multimedia signal, fingerprints of segments of the multimedia signal are generated and matched against fingerprints in the database. When a match is found, one or more associated actions for the segment are retrieved by the device. The trigger time point may be determined as a time point near or at the segment of the multimedia signal with the matched fingerprint. In this way, trigger markers for actions may be enabled without modifying the multimedia signal.

Abstract: This invention relates to a method and an arrangement for embedding a watermark pattern in an information signal. A method of embedding a watermark pattern in an information signal comprising the steps of determining a robust signature as a set of robust features in said information signal, creating a watermark pattern as a signature dependent function of a predefined basic watermark pattern and embedding said watermark pattern in said information signal. The invention also relates to a corresponding method and arrangement for detecting a watermark pattern in an information signal.

Abstract: This invention relates to a device and a method of relating one or more trigger actions with a multimedia signal and corresponding method and device for detecting one or more trigger actions in a multimedia signal. One fingerprint is generated on the basis of a segment of the multimedia signal at each trigger time point. The generated fingerprint(s) is stored in a database and communicated to playback devices. During playback fingerprints of the multimedia signal are generated and matched against fingerprints in the database. When a match is found, associated trigger actions is retrieved. The trigger time point is determined as a time point near or at a segment of the multimedia signal that caused a fingerprint to match. In this way, a simple and reliable way of detecting trigger markers for trigger actions is enabled without modifying the multimedia signal.

Abstract: This invention relates to a device and a method of generating a first and a second fingerprint (102,104) usable for synchronisation of at least two signals (101,103) and corresponding method and device for synchronising two or more signals. A fingerprint pair is generated on the basis of a segment of a first signal e.g. an audio signal and of a segment of a second signal e.g. a video signal at each synchronisation time point. The generated fingerprint pair(s) are stored in a database (203) and communicated or distributed to a synchronisation device (303). During synchronisation, fingerprint(s) of the audio signal and fingerprint(s) of the video signal to be synchronised are generated and matched against fingerprints in the database. When a match is found, the fingerprints also determine the synchronisation time point, which is used to synchronise the two signals. In this way, a simple, reliable and efficient way of synchronising at least two signals is obtained.

Abstract: Hashes are short summaries or signatures of data files which can be used to identify the file. The disclosed method generates robust hashes for multimedia content, for example, audio clips. The audio clip is divided into successive (preferably overlapping) frames. For each frame, the frequency spectrum is divided into bands. A robust property of each band (e.g. energy) is computed and represented by a respective hash bit. An audio clip is thus represented by a concatenation of binary hash words, one for each frame. To identify a possibly compressed audio signal, a block of hash words derived therefrom is matched by a computer with a large database. Such matching strategies are also disclosed. In an advantageous embodiment, the extraction process also provides information as to which of the hash bits are the least reliable. Flipping these bits considerably improves the speed and performance of the matching process.

Abstract: This invention relates to a device and a method of generating a first and a second fingerprint (102,104) usable for synchronisation of at least two signals (101,103) and corresponding method and device for synchronising two or more signals. A fingerprint pair is generated on the basis of a segment of a first signal e.g. an audio signal and of a segment of a second signal e.g. a video signal at each synchronisation time point. The generated fingerprint pair(s) are stored in a database (203) and communicated or distributed to a synchronisation device (303). During synchronisation, fingerprint(s) of the audio signal and fingerprint(s) of the video signal to be synchronised are generated and matched against fingerprints in the database. When a match is found, the fingerprints also determine the synchronisation time point, which is used to synchronise the two signals. In this way, a simple, reliable and efficient way of synchronising at least two signals is obtained.

Abstract: A graphics card of a computer system is configured to detect watermarks within a video signal that includes one or more windows of a display. The frames of the video signal are analyzed to locate image areas in which the video signal changes, and a bounding box around these areas of change is defined as an area(s) of interest. Watermark detection is then performed within the area(s) of interest.

Abstract: Hashes are short summaries or signatures of data files which can be used to identify the file. Hashing multimedia content (audio, video, images) is difficult because the hash of original content and processed (e.g. compressed) content may differ significantly. The disclosed method generates robust hashes for multimedia content, for example, audio clips. The audio clip is divided (12) into successive (preferably overlapping) frames. For each frame, the frequency spectrum is divided (15) into bands. A robust property of each band (e.g. energy) is computed (16) and represented (17) by a respective hash bit. An audio clip is thus represented by a concatenation of binary hash words, one for each frame. To identify a possibly compressed audio signal, a block of hash words derived therefrom is matched by a computer (20) with a large database (21). Such matching strategies are also disclosed.

Abstract: This invention relates to a method of embedding a watermark pattern with a payload in a time dependent information signal, comprising the steps of determining a number of robust signatures in the information signal, creating the payload being dependent of at least one of the number of robust signatures and a predefined message, embedding the watermark pattern according to the payload in the information signal. The invention also relates to a corresponding method and arrangement for detecting a watermark pattern in an information signal.

Abstract: An apparatus for content item signature matching comprises a database (103) which has signatures for a plurality of content items. A likelihood processor (105) determines a match likelihood indication for the content items where the match likelihood indication is indicative of a likelihood of a match between the content item and an unknown signature. An interface (111) receives a query signature associated with a content item and in response a search processor (113) searches the database (103) for a matching signature to the query signature. The search processor (113) is operable to search the database in response to the match likelihood indication of the plurality of content items. In particular the database (103) may be ordered in order of decreasing probability of a match and the search processor (113) may search the database in this order. Hence, the probability of an early match is increased and the average search time is reduced.

Abstract: The invention relates to a system for embedding auxiliary information in a media signal such as an audio visual signal. An apparatus comprises a quantization index modulator (103) which generates a modified signal by quantization index modulation of the media signal. The modified signal has distortions relative to the media signal which are dependent on the auxiliary information. The apparatus further comprises a perception processor (107) which generates a perceptual characteristic indicative of a perceptual sensitivity of the media signal to the distortions. The quantization index modulator (103) and perception processor (107) are coupled to a compensation processor (105) which generates an output signal by modifying a strength of the distortions of the modified signal in response to the perceptual characteristic. The invention combines quantization index modulation watermarking with perceptual models to provide an improved trade off between watermark imperceptibility and detection reliability.

Abstract: Hashes are short summaries or signatures of data files which can be used to identify the file. Hashing multimedia content (audio, video, images) is difficult because the hash of original content and processed (e.g. compressed) content may differ significantly. The disclosed method generates robust hashes for multimedia content, for example, audio clips. The audio clip is divided (12) into successive (preferably overlapping) frames. For each frame, the frequency spectrum is divided (15) into bands. A robust property of each band (e.g. energy) is computed (16) and represented (17) by a respective hash bit. An audio clip is thus represented by a concatenation of binary hash words, one for each frame. To identify a possibly compressed audio signal, a block of hash words derived therefrom is matched by a computer (20) with a large database (21). Such matching strategies are also disclosed.

Abstract: The invention relates to a method for use in a packet-switched communication system, the method comprising: sending a first packet from a source node to a destination node, the first packet containing a first set of data bits; sending a second packet from the source node to the destination node, the second packet containing a second set of data bits; wherein, in the event that the first set of data bits cannot be successfully decoded in the destination node, the second packet further comprises a first set of error correction bits for the first set of data bits.

Abstract: There is provided a method of detecting a watermark included in a signal by way of quantization index modulation (QIM). The signal with the embedded watermark may have been geometrically transformed (e.g. spatially or temporally scaled) prior to detection. In order to detect the watermark even in such case, the embedder imposes an autocorrelation structure onto the embedded watermark data, for example by tiling. Initially, the detector applies conventional QIM detection. This step yields a first symbol vector, which corresponds to the embedded data when the signal was not tampered with, but does not correspond to the embedded data when the signal was subject to scaling. For example, when one data bit is embedded in each pixel of an image, 50% upsampling of the image causes a QIM detector to retrieve 3 data bits out of 3 received pixels, that is 3 data bits out of 2 original image pixels. Surprisingly, the autocorrelation of the first symbol vector will give a peak for a particular geometric transformation (e.

Abstract: This invention relates to a device and a method of generating a first and a second fingerprint (102,104) usable for synchronisation of at least two signals (101,103) and corresponding method and device for synchronising two or more signals. A fingerprint pair is generated on the basis of a segment of a first signal e.g. an audio signal and of a segment of a second signal e.g. a video signal at each synchronisation time point. The generated fingerprint pair(s) are stored in a database (203) and communicated or distributed to a synchronisation device (303). During synchronisation, fingerprint(s) of the audio signal and fingerprint(s) of the video signal to be synchronised are generated and matched against fingerprints in the database. When a match is found, the fingerprints also determine the synchronisation time point, which is used to synchronise the two signals. In this way, a simple, reliable and efficient way of synchronising at least two signals is obtained.

Abstract: The invention relates to a method for generating a primary binary signal having a predetermined spectral shape in a predetermined frequency range, in particular having a notch in the power spectrum in a predetermined frequency range. In order to avoid crosstalk between a primary binary signal and a secondary binary signal it is proposed according to the invention that data-words are modulated into channel-words forming the channel bitstream of the primary binary signal and that the modulation of the data-words is chosen such that the predetermined spectral shape of the channel bitstream of the primary binary signal is achieved by using an evaluation criterion based on a spectral weight function the shape of which is tailored to the spectral extent of the channel bitstream of a secondary binary signal.