Abstract: An antenna for installation in a radio communication device, namely a transmitter and/or receiver, has a substantially cylindrical exterior surface and includes at one end a light source which is a light-emitting diode encapsulated in a housing and electrical connection elements including rings disposed around the cylindrical surface, a light diffusing part at the other end, and an elongated light guide therebetween. The rings are in electrical contact with respective lighting contacts of the communication device when the antenna is installed in the communication device.

Abstract: An adapter circuit PSA includes a comparator module OA, and a regulation module RM for normally adjusting the value of an output voltage Vout intended to be applied to an external circuit to a predetermined nominal regulation value Vreg0. In response to a measuring module SC sensing a reverse current flow at the output which is produced when an external power supply source in the external circuit connected to the output of the adapter circuit PSA includes an effective voltage source Vext which imposes on the output a voltage VDD which has a higher value than the nominal regulation value Vreg0, feedback coupled to an input to the comparator module OA is activated to raise the value to which the output voltage VDD is regulated to equality with the value of the effective voltage source Vext, thereby nulling the output current.

Abstract: This device includes a frequency synthesizer (12) comprising two phase-locked loops (L1 and L2). The one comprises a low-pass filter (68) and the other a high-pass filter (49). The loop with the low-pass filter fixes the basic frequency of the synthesizer and the other corrects the phase noise. With this arrangement it is easy to apply a modulation frequency to the terminal (11) that is not disturbed by said loops if this modulation frequency is found to be higher than the cut-off frequency of the low-pass filter.

Abstract: For battery economizing in a receiving station (CU) having a radio identity code (RIC) consisting of M bits, a base station (MIU) transmits a wake-up message consisting of at least two repetitions of a wake-up sequence having N concatenated parts. Each of the N parts includes a sync code word and a different fraction M/N of bits of a radio identity code (RIC). The receiving station is energized intermittently in order to detect carrier and at least one of the N parts. In response to detecting that one of the N parts is received, the receiving station remains energized and analyzes at least the detected one of the N parts. If the received bits of the transmitted radio identity code do not correspond to the corresponding bits of the receiving station's radio identity code, the receiving station reverts to intermittent energization, otherwise it remains energized to receive a message appended to the transmitted radio identity code.

Abstract: A transmitter having an integratable quadrature oscillator network for simultaneously producing a sine wave and a cosine wave. The digital direction of rotation (whether the frequency is positive or negative) input is slow rate limited (R, C3) and fed into a low gm transconductor (MOS1, MOS2) to softly switch between two pairs of transconductor amplifiers (TR1, TR2 and TR3, TR4) which together with two capacitors (C1, C2) form quadrature oscillators of opposite direction of rotation. By softly switching the quadrature oscillators out-of-band emissions are minimized in a subsequent mixing with a carrier signal to generate a frequency modulated signal.

Abstract: A telephony device includes a base station (BS) connected to a switched network, at least a subscriber unit (HS1, HS2, . . . ) and at least a connecting element (30). The telephony device also includes a management assembly (20) formed by a processor assembly (29), by a memory (26) containing an execution program and by a random access memory (24) for containing, inter alia, program elements to be executed with respect to the management of the links between the switched network, the base station, at least one of the subscriber units and at least one of the connecting elements. Each of the links is ensured by half-calls assigned to the calling and call circuits and by links between these two half-calls.

Abstract: In order that roaming cordless terminals in a telecommunications system have access possibilities in accordance to their subscription, the telecommunications system has a call control protocol in which calls can be set up according to various scenarios, depending upon subscription. When an automatic branch exchange to which the cordless terminal is locked via a cordless access subsystem is coupled to another automatic branch exchange via an intervening network and the cordless terminal's home profile is in the other automatic branch exchange, a remote scenario can be carried out for allowing the cordless terminal to have access to all the features of its home profile. So, cordless terminals having different subscriptions can be dealt with in different ways.

Abstract: An antenna system for a mobile telephone operates by radio channel between the mobile telephone (1) and at least one at a time of a group of satellites (2) revolving in polar orbit or quasi polar orbit around the earth. The antenna system includes a cone-shaped antenna (3) for transmission and reception with at least four equi-angularly spaced apart spiral strands. Radio frequency signal is fed to or from the strands at the apex or small diameter end of the cone with relative phases to selectively produce for circularly polarized radiation, in a first mode of operation (m1), an antenna pattern of substantially hemispherical form, and in a second mode of operation (m2), an antenna pattern of substantially toriodal form. A switch mode function (SWF) block (11) is controlled by a control block (16) to automatically effect selection of the mode of operation in accordance with a priori or a posteriori selection criteria.

Abstract: A radio receiver having a double-balanced mixer stage comprising two pairs of emitter coupled transistors (T1 to T4), the common emitters of each pair of transistors being connected to identical current sources (T5, T6 and T9). A local oscillator signal is applied differentially to junctions (58, 60) of the base electrodes of the first and fourth transistors (T1, T4) and the second and third transistors (T2, T3), respectively. The rf input signal is applied to the common emitter junctions (50, 52) via damping resistors (R3, R4) which also are connected to respective current sources. Outputs from the pairs of emitter coupled transistors are coupled to cascode stages (66, 68). Further damping resistors (R1, R2) are connected between the differential local oscillator input (22A, 22B) and the junctions (58, 60) of the base electrodes. The damping resistors are of a low value typically 25 ohms and serve to stabilize the double-balanced mixer circuit and prevent it from going into oscillation.

Abstract: An image is grouped the image into levels of blocks of pixels, each particular level, except a top level, providing a subdivision of each block of pixels of a next higher level into a respective matrix of blocks of pixels of that particular level. An image source transfers pixel values of all of the pixels to an image receiver like a display device on a block by block basis. The blocks in each respective matrix are transferred consecutively without intervening transfer of pixel values of pixels from other blocks from the same level. This makes it possible to make interchangeable use of image receivers with mutually different resolutions, without requiring a change in the way the pixel values are transferred and without requiring a memory in the image receiver for pixel values that are transferred between the pixel values for one block.

Abstract: A receiving apparatus has a clock frequency generating circuit comprising in a first embodiment a low cost oscillator whose frequency is higher than the wanted clock frequency and in a second embodiment a low cost oscillator whose frequency can be higher or lower than the wanted clock frequency. By means of subtracting pulses from (first embodiment) or adding/subtracting pulses (second embodiment) to/from the output of the low cost oscillator, a clock frequency is generated which is stable within a specified tolerance range.

Abstract: A device includes a housing, a built-in electric printed circuit board and a set of keys positioned near to a wall of the housing. At least a key portion movable by depression, positioned substantially perpendicularly to the wall, is present inside the housing and, aligned to the key portion, a first moving contact actuator portion, as well as a cooperating contact portion that makes breakable electrical contact with the printed circuit board. The depressible key portion is positioned on a first face of a first portion of an elastic carrier plate inside the housing and the first moving contact actuator portion is positioned on the facing second face. The contact portion is connected to a first face of the elastic carrier plate facing the printed circuit board. A second moving contact actuator portion is present on the second face of the second portion of the elastic carrier plate and is aligned to the contact portion.

Abstract: An autobaud method for automatic detection of baud rate and character configuration of a received asynchronous serial data stream by detecting a first predetermined two character sequence in uppercase and lowercase form, notably "AT" and "at", from patterns of signal states and their durations, also provides for detecting a second predetermined two character sequence of "A/" and "a/" and for substantially immediate automatic echoing of the first and second predetermined character sequences if autoechoing is enabled. The baud rate and character configuration used for subsequent characters is not be changed unless, after the autobaud function is enabled, the first predetermined two character sequence in either uppercase or lowercase form is received, and a different baud rate and/or character configuration is determined from the received pattern of signal states and their durations.

Abstract: A decoding system and method for a plurality of transport streams, such as MPEG-2 encoded data streams, in which, in addition to a transport decoder, a predecoder is provided for extracting program specific information (PSI) from the plurality of transport streams. Consequently, in the event of a channel change requiring a different transport stream to be decoded, the PSI is made immediately available to the transport decoder eliminating the delay of waiting for applicable packets in the transport stream to extract the PSI prior to decoding and presenting a program to a user. A fully populated crossbar switch controlled by a micro-controller is used to feed a selected transport stream to the transport decoder and to cause the plurality of transport streams to be successively fed to the predecoder.

Abstract: A projection system includes first and second light sources which are disposed at an angle with respect to each other and are activated during respective different phases of an illumination cycle to illuminate a spot on different sides of a segmented rotary filter wheel. The filter wheel is alternately used to transmit light from one of the light sources, and to reflect light from the other light source, to a light valve, the output of which is projected onto a screen. The wheel segments may be alternately clear and mirrored or may alternately transmit and reflect colors to produce color sequential illumination of the light valve. In addition to filter wheels producing sequences of red, blue, green illumination, including the possibility of splitting a color phase into non-adjacent smaller phases to reduce color artifacts, a simple filter wheel which in two rotations produces a sequence of red, blue, green, cyan, magenta, yellow color illumination, resulting in an expanded color gamut, is also disclosed.

Abstract: In a speech recognition method and system a spoken word to be recognized is broken down into input vectors (K2a), ambient noise is evaluated (K1), a recognized word is chosen from a dictionary having associated reference vectors which are separated from the input vectors by a shortest distance (K3), and the recognized word is validated by a comparison of this distance with a threshold value which is derived as a function of the result of the evaluation of ambient noise. The ambient noise evaluation may be carried out at an instant when the speaker is silent, i.e. either before or after the speaker speaks the word to be recognized.

Abstract: In a telecommunication system, more particularly for the range of ISDN technology, which includes a switching device (1), a telecommunication terminal unit (19) coupled to the switching device (1) via a first number of bus lines (3, 4, 5, 6), and (9, 10, 11, 12) for providing phantom power supply to the telecommunication terminal unit (19) via the first number of bus lines (3, 4, 5, 6), user communication means including actuation switches (28) and indicator lamps (29) are coupled to the telecommunication terminal unit (19) via a second number of bus lines (14, 115, 16, 17). This enables simplified telecommunication with minimum circuitry and cost. Power is supplied to the communication means (28, 29) by the telecommunication terminal via the second number of bus lines (14, 15, 16, 17).

Abstract: A communication device includes a keyboard with key functions and a microphone connected to the outside of the housing of the device by an acoustic path which opens to the outside of the device through one of the keys of the keyboard. The microphone is accommodated either on the inside of the key, or in another arbitrary area inside the device, while still being connected to the acoustic path by an acoustic channel.

Abstract: A small radio apparatus such as a pager has a printed circuit loop antenna(12) comprising a generally elongate loop formed by first and second electrical conductors(22,24) interconnected by first and second electrically conductive end portions(18,20). A fixed value high Q capacitance(26) is incorporated into the first end portion(18) and a variable capacitance(30) is incorporated in a tap(28) interconnecting the first and second conductors(22,24) adjacent to, but spaced from, the second end portion(20). The loop antenna may be fabricated from low loss material or may comprise a track or back-to-back tracks on a dielectric substrate. The loop antenna(12) may be connected directly to RF circuitry or may be coupled inductively to the RF circuitry.