Abstract: A method of hierarchical coding of a digital audio frequency input signal into several frequency sub-bands, including a core coding of the input signal according to a first throughput and at least one enhancement coding of higher throughput, of a residual signal. The core coding uses a binary allocation according to an energy criterion. The method includes for the enhancement coding: calculating a frequency-based masking threshold for at least part of the frequency bands processed by the enhancement coding; determining a perceptual importance per frequency sub-band as a function of the masking threshold and as a function of the number of bits allocated for the core coding; binary allocation of bits in the frequency sub-bands processed by the enhancement coding, as a function of the perceptual importance determined; and coding the residual signal according to the bit allocation. Also provided are a decoding method, a coder and a decoder.

Abstract: A method is provided of coding a video sequence as a video stream having a base layer and one or more refinement layers destined for users having different user profiles. A visual object is coded in at least one of the refinement layers codes, which is distinct from visual objects coded in the base layer or in another of the refinement layers. The visual object corresponds to semantic content destined specifically for the users of one of the profiles.

Abstract: A system for establishing a client/server type relationship in a hybrid peer to peer network connects a first peer (20a) to a second peer (20d) implementing a predetermined function (F) in that peer to peer network. To this end, the first peer (20a) has a superpeer (10a) capable of establishing a list (LF) of the active peers (20d, 20e) implementing the function (F) in the service of the peers of the network and of sending that list (LF) to its peer (20a). The first peer (20a) can then establish a client/server type relationship with a second peer (20d) selected in that list (LF).

Abstract: A method and apparatus are provided for configuring management parameter values of data messages of a data stream. The method includes a first step of sending from a first communications network to a second communications network a first message of the data stream including a first data message management parameter value and a second step of sending from the second network to the first network a second message of the data stream including a second data message management parameter value. The method further includes a step of selecting from the first and second management parameter values a management parameter value to be applied to all the data messages of the data stream.

Abstract: A signaling management method for managing signaling in a telecommunications network, in which, in normal operation, access equipment (21) of said network specifies a registration refresh period P to a terminal (10, 11). According to the invention, after said access equipment (21) has detected a fault affecting the network core (22) and then the access equipment (21) has received a registration refresh request from said terminal (10, 11), the access equipment (21): determines the duration R that remains for the registration in the network core (22) for the terminal (10, 11), and also determines the actual refresh period Q as implemented by the terminal (10, 11) in response to the access equipment (21) specifying thereto a refresh period equal to P; and in the event that R?Q, the access equipment (21) sends registration confirmation to the terminal (10, 11) without relaying said request to the network core (22).

Abstract: Pre-equalizing a data signal transmitted in frequency division duplex by an originating entity having a set of originating antennas to a destination entity having a set of destination antennas, including: transmitting a first pilot by a destination antenna; the originating entity estimating a first impulse response of a first channel; an iterative step including an originating antenna transmitting a second pilot modulated by the first impulse response; the destination entity estimating and time reversing a combined impulse response of the first and second channels; the destination antenna transmitting a third pilot modulated by the time-reversed response; estimating a composite response of the channels; re-iterating the iterative step for some originating antennas; and re-iterating the steps of transmitting a first pilot, estimating the first response, and the iterative step for some destination antennas; and determining pre-equalization coefficients for the data signal from a combination of a set of composit

Abstract: A method of transmitting data and service information associated with said data, including an addressing step during which a set of service information D(Si) that is intended to be stored is referenced by means of an address AD. The address AD includes a session identifier Si, a session being defined as a string of successive activations of different communications means. Service information D(Si) is marked unequivocally by means of an identifier Si that is invariant throughout the session concerned. Thus no element external to that session can reach or degrade the service information, and its permanence is guaranteed until the end of the session.

Abstract: A method and apparatus are provided for coding an image or a sequence of images, generating a data stream including data representative of pixel groups, referred to as blocks, in one of the images. The method includes: grouping blocks in a cluster of blocks according to the proximity of their respective values corresponding to at least one block parameter to be coded; determining a value of the parameter, the value being characteristic of said group of blocks; coding blocks of the cluster, where the values of the blocks for the parameter are coded implicitly by inheritance of the characteristic value or are coded as refinements relative to the characteristic value, and coding a data structure associated with the cluster of blocks, the data structure including data associated with the characteristic value.

Abstract: The method of the invention comprises: a step of receiving a message (M1) sent by a user (T-B) of the first network, said message containing an access rule authorizing a user of a second network to access at least one multimedia content, said content being indexed with a content server (MS-B2) of the first network; a step of sending a first notification message (M2) to a trusted entity (PFS) managing the interface between the first network (NW-B) and the second network (NW-A), the first notification message (M2) containing a remote access rule (RAD) authorizing said user of the second network to access multimedia contents belonging to said user of the first network; and a step of commanding a gateway (HGW-B) of the first network (NW-B) by means of a local access rule configuring said gateway, such that said gateway transmits a catalog of contents to which said user of the second network is authorized to access on reception of an access request relating to said catalog coming from said user of the second ne

Abstract: A method for propagating at least one route for at least one digital stream between a first location server of a first IP telephony domain and a second location server of a second IP telephony domain. The first location server belongs to a first autonomous system and the second location server belongs to a second autonomous system. The method includes sending digital stream routing update messages to the second location server. The update messages contain information for managing quality of service, and, prior to being propagated towards the second server, the information is updated by the first server. The information includes at least one of the following: information about a quality of service component associated with at least one autonomous system, referred to as a system component; and information about a quality of service component associated with at least one IP telephony domain, referred to as a domain component.

Abstract: The invention concerns a method for trained discrimination and attenuation of echoes of a digital audio signal generated from a transform coding, which consists, for each current frame of the signal. In comparing (A) in real time, in at least one frequency band a variable derived from one characteristic of the echo generating signal with that of a non-echo generating signal at a threshold value, and deducing therefrom (B) the existence or non-existence (C) of an echo derived from the transform coding, discriminating the existence of the echo and defining (D) a false alarm zone in the high-energy parts of the digital audio signal, determining an initial processing and attenuating the echoes (E) in the parts complementary to the low-energy false alarm zone and inhibiting (F) the attenuation of echoes in the false alarm zone. The invention is applicable to the technology of coders/decoders in particular hierarchical coders/decoders.

Abstract: A method is provided for transmitting a multiple-carrier signal. The method includes modulating data symbols representative of a data signal to be transmitted, which includes a filtering by at least one prototype function using at least two different filtering coefficients, thus providing a modulated signal including a time sequence of multiple-carrier symbols. A hold interval is inserted in front of at least one multiple-carrier symbol of the modulated signal, thus providing the multiple-carrier signal.

Abstract: A method is provided for filtering a scalable video stream, organized in the form of data unit blocks, each of which comprises a base data unit and a set of data units distributed according to two types of enhancement data, corresponding respectively to time and/or space and/or quality characteristics and making it possible to define several quality levels. The method defines at least two distinct filtering profiles, or paths of each block data units, wherein each path defines a row of successive foldover positions and each foldover position uses at least by one less data units than a previous position, and selects one of the paths according to a predetermined criterion, taking into account the type of content of the stream and/or at least one information item representing the capacities of a terminal receiving the stream.

Abstract: A telecommunication network comprises multiple radio cells (13-15) and a data base (12) which is linked to a multiple number of cells and which comprises information relative to the radio resources of each radio cell of the multiple numbers of cells. The data base is managed by a data base management entity (16). Via the first cell, a requesting message (21) is broadcast to the data base management entity requesting information concerning the radio resources of at least a second cell of the multiple numbers of cells. Then, a response message (22) is received from the data base management entity with the requested information. Finally, radio resources are requested from the second cell on the basis of the information received.

Abstract: A method and apparatus are provided for processing a delayed resource reservation request in an optical telecommunication network for transferring data between a source device and a destination device, wherein the control plane is different from the transfer plane. Upon a node device of the network receiving the resource reservation request sent from the source device to the destination device via a path including at least one node device, the request containing at least one first parameter relating to the start of the connection at the source device, the method includes the following steps: obtaining information relating to a signal transfer time via the path up to an upstream node device; updating the information by adding a signal transfer time at the intermediate equipment; and calculating a date for the start of the resource reservation at the node device using the value of the first received parameter and the information.

Abstract: A method for secure communications in a telecommunications network is disclosed. The network comprises a group of servers Si, referred to as Authorization Servers. For a transaction between an entity A and an entity B of this method comprises: a) entity A sends to one of the Authorization Servers Si an authorization request; b) the entity A declares to the Authorization Server Si its intention to communicate with entity B and the Authorization Server Si determines an individual secret key KSiB which it shares with entity B; c) the Authorization Server Si generates a session key KN,SiAB and sends the session key KN,SiAB to entity A; d) the Authorization Server Si generates a transaction identifier IDTRN,Si; e) the authorization server Si supplies entity B the transaction identifier IDTRN,Si; f) using this transaction identifier IDTRN,Si, entity B checks the validity of the transaction, and g) entity B generates the session key KN,SiAB.

Abstract: The disclosure relates to a method for communication between a secure information storage device and at least one third party with which information is exchanged. An entity ensures the management of a plurality of secure information storage devices to which said device pertains.

Abstract: A method of terminating a call is used by a voice over IP terminal (3A, 3B) registered with an IP network core (2) and comprises a step of detecting the terminal (3A, 3B) hanging up during the call, a step of sending a device of the IP network core (2) a message to release the resources allocated to the call, and after the detection step, a step of waiting a predetermined time before sending the resource-release message. The resource-release message is sent at the end of the waiting step if the terminal (3A, 3B) being picked up is not detected during the predetermined time.

Abstract: The invention concerns the detecting of a double attachment of an equipment communicating both with a wireless network and with a wired network, in particular when the connections with said networks are established by sending a connection configuration request comprising an identifier of the equipment, such as DHCP Host Name. The invention is characterized in that it consists: a) in detecting, at least on the wireless network, connection configuration requests emitted by the equipments (E10), b) analyzing the contents of the requests and extracting the equipment identifiers (E11), c) from one equipment identifier extracted at step b), determining whether said equipment has additionally sent a connection configuration request at least to the wired network with the same identifier (E13), and d) triggering an alarm if the result at step c) is positive (E16).

Abstract: A method and apparatus are provided for establishing a first pseudo-wire between a first item of input terminal equipment and an item of output terminal equipment, used by the first item of input terminal equipment. The method includes a step of transmitting a first message requesting establishment of the first pseudo-wire to an item of switching equipment, the first pseudo-wire to be established consisting of a first link between the first item of input terminal equipment and the item of switching equipment and of a second link between the item of switching equipment and the item of output terminal equipment. In such a method, the first establishment-request message also includes a request to establish at least one backup pseudo-wire consisting of the second link and of a third link to be established between the item of switching equipment and a second item of input terminal equipment.