Abstract: A method for preventing errors in transmission of a telecommunication signal via a network domain, involves transmitting the signal as a succession of binary data frames via two border points in the network domain, and each of the frames comprises a parity array of bits assigned for parity check and a temporary use array of bits assigned to serve at least one temporary data channel between the two border points. The method comprises a) transmitting, via the temporary data channel, additional information between the two border points with performing operation of parity compensation at each of the border points, in the parity array of each of the binary frames, b) obtaining an external command to cease transmission of the additional information via the temporary data channel, and c) executing the external command with performing a procedure of the temporary channels compensation at the border points.

Abstract: A fixing sleeve for optical cables comprises along a common axis (A), both a first portion (11) that is substantially cylindrical and a second portion (12) that is substantially conical, said first and second portions being pierced by an axial bore (13). The sleeve (10) carries along its entire length a continuous slot communicating with said axial bore (13), the slot comprising a longitudinal first slot (110) in the first portion (11) of the sleeve, and a spiral second slot (120) in the second portion (12) of the sleeve. The sleeve is applicable to laying optical cables inside buildings.

Abstract: A macro-micro cell structure of wireless communication system for separately processing a forward and a reverse telecommunications in order to increase a reverse link capacity is disclosed. The wireless telecommunication system has a macro cell and at least one micro cell within the macro cell. A micro cell signal processing unit processes a transmission and reception signal of a mobile station located at a service region of the micro cell. A micro cell base station transmits a micro cell forward signal provided from said micro cell signal processing unit to the mobile station to receive a micro cell reverse signal, and receives a macro cell reverse signal of the mobile station which is located at the macro cell and has a short wave path contrast to the macro cell. A macro cell signal processing unit transmits a forward signal to the mobile station through a macro cell antenna and processes the reverse signal provided from said macro cell antenna or said micro cell base station.

Abstract: A method for providing a connection between a client and heterogeneous database management systems, includes the steps of: a) generating a thread in response to a request message transmitted from the client; b) determining what is the request message and operating a database driver to process the request message by referring to a client information management table; and c) registering identification information of a client and a database in the client information management table and transmitting an execution result corresponding to the request message from the database driver to the client.

Abstract: To avoid recourse to a certification authority and to keep a trace of delegation to a delegate by a titleholder, a terminal of the titleholder draws up a second electronic certificate different from the normal certificate of the delegate. The second certificate includes at least a delegation attribute and a signature of the data in the second certificate by means of a private key of the titleholder. The titleholder behaves like a certification authority in respect of the second certificate, which is used for cryptographic actions by the delegate in the name of the titleholder.

Abstract: This method of automatic processing of a speech signal comprises:

Abstract: A method of fabricating an SON structure semiconductor device is described. There is formed, on a silicon substrate, a stack of layers comprising first and second successive combinations. Each successive combination has a bottom silicon-germanium alloy (Site) layer and a top silicon layer. In a conventional way, a gate dielectric layer, a gate, spacers, source and drain regions, and an external passivating layer are formed by ionic implantation. A vertical hole is formed in the gate as far as the bottom Site layer to etch a part of the Site layers to form tunnels. The walls of the hole and the tunnels are then internally passivated so that the tunnels can remain empty or be filled.

Abstract: A method for dynamically adding a new channel to a group of virtually concatenated channels carrying traffic to a network element (NE) of a synchronous network. By this method if a delay associated with the new channel is longer than a delay associated with the group of virtually concatenated channels then traffic received along the group of virtually concatenated channels is delayed until the group of virtually concatenated channels and the new channel are time-aligned, and then the new channel is added to the group. If the delay associated with the new channel is shorter than the delay associated with the group of virtually concatenated channels then traffic in the new channel is delayed until the new channel and the group of virtually concatenated channels are time-aligned, and then the new channel will be added to the group.

Abstract: A sound pick-up and reproduction system includes at least two sound sensors, such as microphones, situated at different distances from a sound reproduction device, such as a loudspeaker. A processor responds to amplitudes and phases of signals outputted by the at least two sound sensors to control a signal outputted to an amplifier and adapted to drive the sound reproduction device, thereby reducing echoes in the sound reproduction device output caused by acoustic coupling between the at least two sound sensors and the sound reproduction device.

Abstract: A method of conjoint detection of a set of CDMA codes received at a plurality of antennas of a receiver like a mobile telephone receiver. The codes are transmitted via a transmission channel with transfer matrix A satisfying the equation e=A.d+n, where d is the set of symbols of the codes transmitted, n is an additional noise vector and e is the set of received samples.

Abstract: A method for requesting a grant for Medium Access Control (MAC) being applied to a Passive Optical Network (PON) system. The method includes the steps of: a) deciding a period of a mini slot (Tms), which is necessary for a plurality of Optical Network Units (ONU) to transmit upstream cells to an Optical Line Termination (OLT); b) deciding a period of a divided slot (Tds) and a link overhead (Co) based on the period of the mini slot (Tms); c) calculating a length of the mini slot based on information to be transmitted to the OLT and a protocol being used; and d) requesting a grant for a MAC protocol between the plurality of the ONUs by calculating and allocating optimal parameters based on the length of the mini slot.

Abstract: A device for monitoring a modulation frequency of an optical signal,—in particular a device for monitoring the modulation frequency of an optical signal modulated at a microwave or millimetric frequency—, the device being characterized in that it comprises a photorefractive crystal (7), a photodetector (6), and means (8a, 8b, 8c; 9a, 9b, 9c) for applying to said crystal (7) firstly at least a fraction of the modulated optical signal and secondly a write optical signal for photoinducing a Bragg grating on said crystal (7), the orientations of the modulated optical signal and of the write optical signal relative to said crystal (7) being such that at a given wavelength of the optical signal the photodetector (6) detects an intensity for the signal reflected by the crystal (7) that reaches a maximum when the optical signal is modulated at the modulation frequency to be detected.

Abstract: Definition takes place of a sliding window of width Ne times the sampling period (Te); for each sliding window calculation takes place of the sum of the elementary powers of the correlation samples located in said window; determination takes place of the window for which the sum of the powers is at a maximum, the synchronization then being defined by the position of the synchronized window on the window having the maximum power sum and by the rank of each correlation sample within said window.

Abstract: The present invention relates to an echo reduction method implemented with a multi-sensor sound pickup device (8) forming an antenna (10), and a sound playback device (13). The method consists in subjecting the output signals ym(t) from the sensors (11m) to complex weights w(f), said weights w(f) being calculated by maximizing the directivity factor Fd(f) under constraints at low frequencies and in the near field. The invention also provides an echo reduction apparatus (6). The apparatus comprises: a multi-sensor sound pickup device (8) forming an antenna (10); means for calculating a first constraint; and means for calculating a second constraint.

Abstract: Each of ISDN extension terminals which are connected in a point-multipoint connection mode transmits call initiation information while identification information thereof is contained in the call initiation information when a call is initiated: a private branch exchange includes a main memory for storing a table representing the corresponding relationship between the extension number and service class information, and a central processing equipment for searching the service class information corresponding to the extension number contained in call initiation information from the table when the call initiation information is received from an extension, and performing call processing in accordance with the service class information thus searched, whereby even when a plurality of extension terminals are connected to an exchange in the point-multipoint connection mode, the service class management can be performed for every extension terminal.

Abstract: A method of fabricating a semiconductor device consisting of a silicon substrate on which is formed a stack of layers is described. The stack may have successively at least one first and one second combination. Each combination may consist, with reference to the substrate, of a thin bottom SiGe layer and a thin top silicon layer. A thin silicon dioxide film (18) is formed on the thin top silicon layer of the second combination so that the layer concerned supports the layers of the stack on at least two opposite lateral sides of the stack. Successive selective lateral etching of the SiGe layers is then carried out to form tunnels which are filled with a dielectric material.

Abstract: The invention concerns an optical switch for optical beams comprising a series of optical input channels (110) and a series of optical output channels (210), two optical index spatial modulating cells (300, 400) adapted to respectively deflect an optical beam coming out of an input channel and arriving onto an output channel, each series of optical channels (110, 210) being distributed according to two dimensions transverse to the direction of the channels and the index spatial modulating cells (300, 400) being each designed to produce deflections according to said two dimensions.

Abstract: This invention discloses an apparatus including an input, a series of shift registers and an output, the input arranged to receive a plurality of serial data streams, each of the data streams containing groups of data, and to take simultaneously data bits from at least some of the plurality of serial data streams and to place the data bits into the series of shift registers, such that the data bits of a given bit position in the data groups of the some of the plurality of serial data streams are placeable together in one of the shift registers, and successive bits of a part of one of the data groups are placed in a given data position across the shift registers, and the output being arranged to read out, in parallel, data of a given data position across the series of shift registers, simultaneously. A method of converting a plurality of serial data streams each carrying data groups into parts of the data groups arranged in parallel is also disclosed.

Abstract: The distribution of calls to directory inquiry centers is concentrated in a server which reduces the traffic between the centers. For a given center, the server cyclically determines a forecast waiting time of the calls as a function of an average waiting time per call which it estimates for the given center, and compares the forecast waiting time with two thresholds so as to decide to route the calls to the given center or to another, less heavily loaded, inquiry center, and with two other thresholds so that the given center accepts calls from other, more heavily loaded centers, or refuses them if it is itself saturated.

Abstract: The interfacing device handles asynchronous/synchronous adaptation and rate control between the ATM flows and the flows transmitted on the wireless interface. It transposes the ATM cells (53 octets) into packets which can be transmitted directly on the wireless interface (40 octets in the case of DECT). Similarly, at the receiving end, it reconstructs the original ATM cell flow on the basis of the packets received. In order to guarantee a certain transmission quality at the level of the wireless link, the device uses a data acknowledgement and retransmission mechanism adapted to the characteristics of the synchronous wireless channel. In order to fulfil the quality of service requirements of the various applications in terms of error rates and transmission delays, the device allows the data protection mechanism to be set for each ATM connection depending on the characteristics of the service.