Abstract: An electronic device includes a microprocessor connected to an input keyboard comprising primary conductive lines connected to primary areas and to a terminal. It further includes first, second and third secondary conductive lines connected to secondary areas and to a terminal. It further includes input keys each of which, when operated, establishes contact between a primary area of a primary line and a secondary area of a secondary line to place each of these two lines in a high state.

Abstract: A portable communication device with an external housing (1) containsat least a mechanical switch (2a; 2b) and at least one key (3) for actuation of said mechanical switch (2a; 2b), said key comprising an actuation surface (30) which protrudes from said external housing through an aperture (10), and the mechanical switch being able to be actuated by swiveling of the key (3) around an axis (XX?) substantially perpendicular to said actuation surface. According to the invention said key is made of plastic material and comprises, in its thickness and behind said actuation surface, at least one emerging slit (31a; 31b) extending substantially parallel to said actuation surface.

Abstract: The present invention relates to an electronic device comprising a casing containing a printed circuit (50) and comprising a front face (10) and a rear face (20), and a removable keypad module (40) electrically connected to the printed circuit (50). According to the invention, the device further comprises a removable clip (60) that encloses the perimeter of the keypad module (40) in order to lock the keypad module to said front face (10).

Abstract: A man-machine interface device for a telephone terminal for selecting options offered to the user when using services offering such options indicates to the terminal the various options that can be selected and determines, in a manner specific to each terminal, the mode of presentation of the options to the user for the purpose of making the selection.

Abstract: This method of compressing messages, in particular messages intended to be displayed on a telecommunications terminal, in particular a portable telephone, is essentially characterized in that, with said messages being made up of words themselves made up of characters, it includes compiling two encoding tables, namely an “encoding table for compressing words”, causing each compressed word represented by its rank in the table to correspond to a “semi-compressed” word made up of a sequence of compressed characters corresponding to the word, and an “encoding table for compressing characters”, causing each compressed character represented by its rank in the table to correspond to a non-compressed character.

Abstract: A mobile radio network provides additional services over and above a basic service. A public telecommunication terminal suitable for this network has provision for entry of terminal control data. The terminal recognizes additional service control data and prohibits action on data thus recognized.

Abstract: A mobile radio terminal is adapted to receive a protective cover and includes guides that cooperate with fixing arrangements on the cover. The guide is accessible to the fixing arrangements via one face of the terminal so that the cover is removable.

Abstract: A receiver of block coded speech signals receives signals transmitted by means of discontinuous transmission and estimates the acceptable or unacceptable nature of the blocks received. A volume control device commands reduction of the volume in the case of reception of unacceptable blocks. A detector, on the basis of the results of the estimate, determines if the signals received are signals transmitted using discontinuous transmission. The volume is restored in the case of such detection.

Abstract: A multimode radio communication terminal includes a tunable source of transmit and/or receive local oscillator signals for transmitting and/or receiving channels of different frequency bands in at least two radio communication systems. The terminal includes, downstream of the tunable source, a switchable frequency changer implementing a fixed frequency change and selectively insertable so that, the source responding directly to the requirements of one radio communication system, insertion of the frequency changer renders it capable of responding to the requirements of another radio communication system using different frequency bands. This is achieved by virtue of a particular change to the frequency produced by the tunable source, effected by the frequency changer.

Abstract: A mobile telephone includes an antenna device attached to the casing of the telephone which includes an antenna cap covering an antenna which is situated near one wall of the antenna cap. The antenna device includes an off-centering arrangement such that, when the antenna device is fixed to the casing, the antenna is automatically placed and secured at the position farthest away from the head of the user. The antenna is therefore always separated from the head of the user by a minimal distance during a telephone call.

Abstract: A signalling packet for a communication system has a reference signal to support time and frequency synchronization. The reference signal is modulated so that it varies with time according to a predetermined modulation law. The variation is with respect to both the I and Q channels. Because of the variation with time, receivers can synchronize in frequency and in time with a base station in a simplified manner. Doppler shift can be determined and compensated.

Abstract: A portable telephone has a keypad, a screen and a plate under the keypad and including some of the electronic circuits of the telephone and contacts actuated by keys of the keypad to operate the telephone. An identity card is inserted in a cavity under the plate so as to place it in contact with an identity card connector located under the "navigator" key of the keypad on the opposite side of the plate to the identity card. The connections between the connector and the identity card are made by contacts carried by the connector through an opening in the plate. This saves space and reduces the thickness of the telephone.

Abstract: A terminal of a cellular mobile radio system cooperates with a user card and is able to operate in at least two separate operating modes, namely a normal mode in which it can be used with any user card and a locked mode in which it can be used only with the user card to which it is locked, the latter constituting a linked user card. To make use of the terminal more secure, first locking data is stored in a memory area of the linked user card and, in the locked mode, the method includes a phase of authentication by the terminal of the user card with which it is cooperating.

Abstract: A device for testing telecommunication terminals for telecommunication systems, in particular mobile radio systems, of the multiple access type, using a particular multiplex structure, transmits test information between the test device and a plurality of terminals under test by multiplexing in accordance with this multiplex structure.

Abstract: To authorize the selection of a cell in a cellular mobile radio network terminal in the standby state, a parameter is calculated representative of the transmission quality with reference to that cell. If the parameter has a sufficient value relative to a cell selection threshold, setting up of a call involving said terminal is authorized in relation to that cell. If the parameter does not have a sufficient value relative to the cell selection threshold, but has a sufficient value relative to a cell deselection threshold, less than the cell selection threshold, some or possibly all of the functions relating to setting up of a call involving said terminal are authorized in relation to that cell.

Abstract: A digital radiotelephone installation with mobile terminals includes a fixed base transceiver station, which is an element of the network, and mobile telephone terminals at least some of which are designed to be unable to access the network until a user has inserted therein an extractable personalized smart card ("SIM card"). Each mobile terminal is designed to receive, in addition to the extractable "conventional" SIM card, another, auxiliary SIM smart card which remains in the mobile terminal at all times. The auxiliary SIM card corresponds to the same personalized subscription as the conventional SIM card. The extractable conventional SIM card takes precedence over the auxiliary SIM card when it is inserted into said mobile terminal, however, and has the same functionality as the latter.

Abstract: The electrostatic protection consists in a protective sheet incorporated in the set between the shell and the elements to be protected, the sheet comprising a conductive layer and an insulating layer, the sheet being cut to the appropriate shape, and being made of materials, such as a foam made of a plastics material, that make it easily formable so that it fits the shape of a space left empty to receive it inside the set. The conductive layer is a thin sheet of metal or of metal fibers.

Abstract: Method and apparatus for detecting voice activity in an audio signal, the method comprising computing the autocorrelation coefficients of the signal, identifying a first autocorrelation vector whose components comprise a first series of autocorrelation coefficients, identifying a second autocorrelation vector whose components comprise a second series of autocorrelation coefficients offset from the first series by a predetermined offset value, subtracting the first autocorrelation vector from the second autocorrelation vector to obtain a differentiation vector, and computing a norm of the differentiation vector, which differentiation vector norm represents a first indicator of voice activity.

Abstract: The invention provides a system for dynamic distribution of processing time during a frame in a station operating in time-division multiple access mode. The system comprises a set of N independent configurable processing resources respectively associated with N time windows in the frame, where N is a predetermined integer greater than 1. The N configurable processing resources can be configured to yield N respective configured processing resources each of which is activated for a respective particular processing operation for which it has been configured. Each of the N previously configured configurable processing resources is activated so that the respective particular processing operations are effected during the frame.

Abstract: A synchronization device for a terminal of a radio communication system, adapted to identify a control channel constituting one of a plurality of receive channels by means of a receiver (2) comprises means (3) to measure the power of the receive channels and means (4) for attempting synchronization to at least some of said channels identified in a list (5), and is characterized in that, the system being such that a reference channel (C.sub.r) of nominal power (P.sub.r), its ith predecessor (C.sub.r-1) and its ith successor (C.sub.r+1) have an ith attenuation (A.sub.i) when the receiver (2) is tuned to the reference channel (C.sub.r), it comprises selection means whereby the ith predecessor (C.sub.r-i) or the ith successor (C.sub.r+1) do not appear in the list if its power is less than the nominal power (P.sub.r) of the reference channel (C.sub.r) reduced by the ith attenuation (A.sub.i).