Abstract: In a wireless communications arrangement, a method is disclosed of providing location based services to at least one mobile terminal MT, the mobile terminal MT being adapted for roaming between a plurality of access points AP1-n and for wireless communication therebetween. The access points AP1-n are controlled by a network control means (10) and the method includes: a) the control means (10) activating location based services LBS only on receipt of a predetermined message sent thereto from the mobile terminal MT though an access point AP; and b) the control means (10) determining the location of the mobile terminal MT based on a network address of an access point AP through which said predetermined message was sent and directing said location based services LBS to said mobile terminal MT through said access point AP.

Abstract: A multi-channel audio conversion system is described, comprising audio mode converting means having a signal input and a signal output for converting audio input signals to audio output signals representing audio in an audio output mode. The audio mode converting means are arranged for user controlled conversion from the audio input signals to the audio output signals. Advantageously the influencing of the conversion from audio input signals to audio output signals may take place by the listener. This results in a smooth and personalized freedom of choice regarding the amount of multi-channel stereo and/or surround effects in the audio output signals of the system.

Abstract: The invention relates to a method, the use of such a method and an integrated circuit for altering memory configurations in a physical memory. A memory configuration comprising memory pools of memory packets can be changed into a new memory configuration by detecting a released memory packet within a memory pool of said first memory configuration, assigning memory from said released memory packet to said second memory configuration, determining the size of said assigned free memory of said second memory configuration and allocating within said assigned free memory a required amount of memory for a memory packet of a pool of said second memory configuration in case that assigned free memory size satisfies that allocation request. By said transition a seamless mode change may be applied and memory packets released within a first mode may already be used by said second mode. Fragmentation may be avoided.

Abstract: A method of operating a speech dialogue system (1) is described. For controlling the dialogue for selecting one of various services (9, 10) of the dialogue system (1) by the user, a database (6) is used which has a hierarchical data structure (DS) with a plurality of nodes (K) and a plurality of paths (P) for interconnection of the nodes (K) and for connecting the nodes (K) to service objects (D) which are arranged at a respective end of the path (P). The service objects (D) represent the services available (9, 10). The nodes (K) represent respective categories in which further categories and/or the services classified thereunder are arranged. At least to part of these service objects (D) and/or nodes (K) leads a plurality of paths (P). To each node (K) and each service object (D) is furthermore assigned at least one keyword (S).

Abstract: Transceivers for use in time division telecommunication units like mobile phones and base stations can be produced at lower costs by, in a transmitting mode, switching the direct digital synthesizer (DDS 24) driven phase locked loop (PLL 10-15) into a modulating state and supplying a modulation signal to the DDS and switching in the PLL a first filter (12) allowing the generation of an improved modulated signal, and by, in a receiving mode, switching the DDS driven PLL into an oscillating state and supplying a non-modulation signal to the DDS and switching in the PLL a second filter (13) allowing demodulation with reduced phase noise. A transmitter part (2) and a non-transmitter part (4,6) share a single DDS driven PLL, based upon the basic idea of using important parts in low cost transceivers for both modes, instead of using different parts for different modes, and achieve a good performance.

Abstract: In a ballast circuit for supplying a high pressure discharge lamp and comprising an up-converter and a bridge circuit, the output voltage of the up-converter is controlled at a higher level immediately after the ignition of the lamp and at a lower level during stationary operation. Stabilization of the discharge immediately after ignition of the lamp and a relatively small power dissipation are both realized in this ballast circuit.

Abstract: A method of data transmission between mobile telephones, wherein a request signal is sent from a first mobile telephone via a wireless communication interface to a second mobile telephone, and the telephone number of the second mobile telephone is transmitted to the first mobile telephone.

Abstract: Systems (1) for allocating channels to calls by firstly searching its own cluster of channels and then searching subsequent clusters of channels until a free channel has been found are provided with updating options for updating cluster priorities in dependence of searching results. These systems (1) have integrated the updating and the call handling, which improves the efficiency of the self-organizing capabilities compared to separated updating and call handling. Said updating may comprise the increasing of a cluster priority for a cluster comprising an available channel and the decreasing of a cluster priority for a cluster not comprising an available channel. An original cluster may correspond with a cell receiving a request for allocating a channel to a call, and a subsequent cluster or borrowed cluster may then correspond with a neighboring cell. Said updating may be done for borrowed clusters and may not be done for original clusters.

Abstract: A system (100) comprising a plurality of interconnected devices (101-105) and being arranged to provide the devices (101-105) conditional access to protected content items, characterized in that the system (100) is arranged to restrict the number of simultaneous sessions involving said protected content items to a predetermined total limit. Preferably the system (100) restricts the number of content items that can be accessed simultaneously to the predetermined limit. Security modules (300) such as smart cards can be used for this purpose. Each security module (300) may be arranged to restrict the number of content items to which it provides access simultaneously to an individual limit which can change over time. The system restricts the sum of the individual limits to the predetermined total limit. If the limit is reached, further sessions may he refused or allowed at reduced quality level.

Abstract: A display apparatus comprises a signal converter (SC) which converts input text information (IT) and interlaced input video information (IV) with a number of video lines (Li) in a video field (Fi) into a display signal (DS) which comprises display text (Ti) and display video (Vi). An addressing circuit (AD) addresses a display screen (DSC) of the display apparatus in successive non-interlaced display fields (Fi) which have a duration substantially equal to the video field (Fi) and a number of display lines (DLi) which is substantially twice the number of video lines (Li). The signal converter (SC) has an output to supply the display signal (DS) in which the display video (Vi) is present on odd or even display lines (DLi) only, in respective successive display fields (Fi), and in which the display text (Ti) is present on same display lines (DLi) of the successive display fields (Fi).

Abstract: The invention relates to a method of determining the position of a catheter introduced along a guide wire inserted into a body, in which method an image of the guide wire and the body region at the area of the guide wire is acquired by means of an imaging method, the distance traveled by the catheter on the guide wire is measured and the position of the catheter in the body is determined on the basis of the measured distance. The invention also relates to a device for determining the position of a catheter introduced along a guide wire inserted into a body, which device includes sensor means for measuring the distance traveled by the catheter on the guide wire and means for determining the position of the catheter on the basis of the measured distance.

Abstract: A communication station and communication method for effectively multiplexing data into a combined data stream by adding a special header to the combined data packet. The bit positions of this special header indicate the presence of data packets in a data stream in a combined data packer. The combined data packet is transmitted from the first to the second communication station through a first communication channel. Changes in the data streams can be communicated to the receiving communication station through a second communication channel, so that the second communication station can restore relations between data streams and recreate stripped headers.

Abstract: In known telephone subscriber end stations a caller_ID IC detects a tone alerting signal TAS alerting that successive caller_ID information can be received for displaying on a display of the phone. The known station applies narrow frequency band filters to detect tones indicating the end of TAS. Such a detection is not flexible as it can only be used for a specific caller_ID signal protocol. A flexible detector is proposed which can easily be adapted to widely varying protocols and which can also be used for other purposes such as the detection of power drops in an FSK signal. The detector comprises means for determining a time-domain signal representing the signal energy of a signal on the subscriber line in a predetermined time interval.

Abstract: A software controlled imaging system wherein an application module is interconnected to a user interface controller module and which also includes user interaction elements and an imaging subsystem. The user interface controller module is arranged to generate a pull request to the application module which in turn is designed, in a demand driven organization, to output one or more User Interface elements to the user interface controller module. The user interface controller module decides which GUI elements will be rendered and when and how they will be structured.

Abstract: The private and public keys of users, as encrypted with a symmetric algorithm by using individual user identifying keys are stored at a network server, indexed or addressable by user ID, and are sent to the user equipment only when needed. The user identifying keys are determined by hashing the users' respective passphrases or biometric information. After use, the private key and user identifying key are not retained at the user equipment. The encrypted private key is transmitted via the network to the user equipment along with a document to be approved by the user (in the case where the private key is used for digital signature) and, at the user equipment, the received encrypted private key is decrypted using a key determined at the user equipment by hashing either the user's passphrase, which is entered by the user, or the user's biometric information which is obtained by measurement or scanning the user.

Abstract: The motion estimation unit (100) comprises a block-matcher (102) for calculating a start motion vector (110) by minimizing a predetermined cost function as a matching criterion for the block (116) of pixels with a further block of pixels (122) of a further image (120). The motion estimation unit (100) further comprises an optical flow analyzer (104) for calculating an update motion vector (111) based on the start motion vector (110) and which is designed to find the most appropriate set of optical flow equations corresponding to respective pixels of the block (116) of pixels. This is achieved by analyzing gradient vectors of optical flow equations for pixels of the block (116) of pixels. Finally the selector 106 of the motion estimation unit (100) selects the motion vector (126) by comparing the start motion vector (110) with the update motion vector (111).

Abstract: A system and method for verifying digital recordings that have a plurality of tracks. The system includes an encoder that: divides the digital recording into a plurality of sections and associates a random number with each section; calculates an identifier as a function of the associated random numbers; and watermarks sections within a block of sections with the associated random number and a portion of the identifier. A verification system is provided that extracts the random numbers and identifier portions; calculates a first identifier as a function of the extracted random numbers; calculates a second identifier based on the identifier portions; and compares the first identifier and the second identifier.

Abstract: A bridging system for a communication system comprises a first gateway (107) and a second gateway (108) arranged to communicate with each other. Each gateway (107, 108) is connectable to a different bus (100, 105) of the communication system. The first gateway (107) is operative to communicate details of available devices (102, 103) on its respective bus (100) to the second gateway (108). The second gateway (108) is operative to generate at least one proxy element corresponding to each of said available devices (102, 103). Each proxy element is operative to communicate data and messages between devices (130) on the bus (105) of the second gateway (108) and the device on the first gateway (100) corresponding to the proxy element.

Abstract: A method for providing name-face/voice-role association includes determining whether a closed captioned text accompanies a video sequence, providing one of text recognition and speech to text conversion to the video sequence to generate a role-name versus actor-name list from the video sequence, extracting face boxes from the video sequence and generating face models, searching a predetermined portion of text for an entry on the role-name versus actor-name list, searching video frames for face models/voice models that correspond to the text searched by using a time code so that the video frames correspond to portions of the text where role-names are detected, assigning an equal level of certainty for each of the face models found, using lip reading to eliminate face models found that pronounce a role-name corresponding to said entry on the role-name versus actor-name list, scanning a remaining portion of text provided and updating a level of certainty for said each of the face models previously found.

Abstract: A radio communication system has a random access channel for the transmission of data from a secondary station to a primary station while the secondary station is not engaged in a call. A secondary station wishing to use a random access channel resource transmits a preamble encoded with a signature corresponding to the required resource. In response the primary station can transmit a positive acknowledgement (ACK) corresponding to the received preamble, indicating that a channel is available, or a negative acknowledgement (NACK), indicating that the resource is not available. A first set of signatures are used to encode ACKs and a second set of signatures are used to encode NACKs. The two sets of signatures have the property that no signature in one set is the inverse of a signature in the other set, thereby avoiding the possibility of simultaneously transmitting an ACK and a NACK with signatures that are the inverse of one another.