摘要:
Il est proposé un procédé de pistage mis en œuvre par un dispositif de pistage comprenant un module de radiocommunication permettant la réception de porteuses de radiocommunication. Le procédé comprend : une phase de configuration comprenant une étape de sélection (El) de porteuses de référence, parmi des porteuses détectées par le module de radiocommunication dans une position géographique de référence du dispositif de pistage; une phase d'utilisation, comprenant les étapes suivantes, pour au moins une position géographique courante du dispositif de pistage : détermination de porteuses courantes (E3), détectées par le module de radiocommunication; détection d'un déplacement du dispositif de pistage (E4, E5, E6), par comparaison des porteuses courantes avec les porteuses de référence.
摘要:
The invention relates to a low power radio frequency receiver which comprises: (a) an antenna for receiving a first radio frequency signal; (b) a radio frequency amplifier for amplifying the first radio frequency signal received by said antenna; (c) an oscillator for generating a second radio frequency signal having a predefined frequency and a predefined duty cycle to be mixed with said first radio frequency signal received by said antenna; (d) a mixer for mixing the first amplified radio frequency signal with second radio frequency signals and generating a third radio frequency signal; (e) an intermediate frequency filter for passing one or more intermediate frequencies of said third radio frequency signal and attenuating other frequencies of said third signal that are lower or higher than its cutoff frequencies, characterized in that it further comprises: (f) one or more switches for periodically and synchronously switching ON and OFF one or more of said radio frequency amplifier, said oscillator, and said mixer, said switches controlled by means of a control signal having a frequency that is higher than the frequency of data embedded within said first radio frequency signal; and (g) a control unit located within said radio frequency receiver for providing said control signal, wherein each of said switches is connected to a corresponding capacitor within said radio frequency amplifier, or oscillator, or mixer, said capacitor storing an operating point of said radio frequency amplifier, or oscillator, or mixer when said radio frequency amplifier, or oscillator, or mixer is switched OFF.
摘要:
An arrangement (1) comprises first communication means (COM1) for contactless communication with a cell communication station (Z1, Z2, Z3) within a cell communication range (ZA1, ZA2, ZA3) of a cellular communication system, and second communication means (COM2) which are designed, independently of the first communication means (COM 1), for contactless communication with a second communication system (B1, B2). The second communication means (COM2) can be activated by means of an activation signal (AS) that can be fed thereto, wherein the arrangement (1) has activation means (2) which are designed to detect the presence of a second communication system (B1, B2) within a cell communication range (ZA1, ZA3) by evaluating communication signals (ZS 1 - ZS3) between the first communication means (COM1) and a cell communication station (Z1 - Z3) and, if the presence of the second communication system (B1, B2) is detected, to output the activation signal (AS) to the second communication means (COM2).
摘要:
Dans la présente invention, on propose un procédé de génération de base de temps dans un téléphone mobile dans lequel on ne fait intervenir qu'un oscillateur haute fréquence (304), un oscillateur basse fréquence habituellement utilisé ayant été supprimé. On revient ainsi à une architecture initiale des téléphones mobiles dans laquelle seul un oscillateur haute fréquence était utilisé pour générer une base de temps. Dans l'invention, afin de limiter la consommation d'un téléphone mobile qui n'est pas dans un mode de communication, on prévoit la définition de différents modes de fonctionnement (301 ; 302 ; 303), chaque mode de fonctionnement étant associé à un mode d’alimentation spécifique du système de génération de base de temps, le téléphone mobile passant d’un mode d’alimentation à l’autre en fonction de ses conditions d’activité.
摘要:
An interface between an RF processing section and a baseband processing section supports general purpose message transmission as well as satellite positioning system signal sample transmission between the RF processing section and the baseband processing section. The interface includes a bi-directional message interface and a data interface. The message interface supports transmission of power control messages to the RF processing section to provide detailed control over activation or de-activation of individual blocks of hardware circuitry in the RF processing section.
摘要:
In a semiconductor integrated circuit (RFIC200), constituting a digital audio broadcast receiver, for amplifying and frequency converting a received signal, there are provided a register (263, 265) having bits that correspond, in one-to-one relationship, to internal circuits (LNA, mixers, amplifiers, etc.) to be controlled, and an operation control circuit (264) for producing signals that control the operations of the internal circuits in accordance with ON/OFF control signals from a system controller (400) and the set values of the register. Values for designating circuits whose operations are to be stopped are set to the register via a bus in advance, whereby only the ON/OFF control signals from the system controller need to stop the operations of the designated circuits.
摘要:
Apparatus, and an associated method, for selectably reducing the current consumption of a communication device (12), such as a mobile station (12) operable in a cellular communication system (10). Portions (44, 48, 58, 88) of the communication device operated at desired power levels but at reduced current consumption levels, thereby to reduce power consumption of the communication device (12). When the communication device (12) powered by a portable power supply, the longevity of the portable power supply is increased, as lessened amounts of power are required to operate the communication device (12).
摘要:
A power controlled input receiver (100), in accordance with the present invention, includes a receiver circuit (102) including a first current source (N4) and a second current source (N3). The first current source supplies current in a power down mode of the receiver and the second current source is enabled for supplying current in a normal operation mode. A signal state detection circuit (106) is coupled to the receiver circuit for detecting an active input signal (VIN), and a control signal generator (116) is coupled to the signal state detection circuit for generating an enable signal (VINSTATE) to enable the second current source when the active input signal is detected.
摘要:
A radio transmitter comprises a data burst randomizer (19) for determining the transmission rate according to speech signals; an IF synthesizer (5) for generating an IF signal for modulation; a modulator (6) for speech modulation based on the IF signal; a main synthesizer (9) for generating an RP signal for frequency conversion; a frequency converter (8) for converting the frequency of the modulated signal based on the RF signal; and amplifiers (12, 14) for amplifying the modulated signal to produce output. Power is supplied to at least the IF synthesizer (5), modulator (6) and frequency converter (8) at an instant based both on the determined transmission rate and on the settling time of the IF synthesizer (5) and main synthesizer (9). Current consumption can be definitely reduced while securing the stable operation of the synthesizers.