Abstract: The display device includes a display cell including liquid crystals and a matrix of electrodes arranged in lines and columns in a closed cavity. The lines and columns define display cell pixels. The display device includes a control circuit for lines and columns for display of data on the display cell. In complete display mode, all lines and columns are addressed at several voltage levels by successive line-by-line multiplexing. In low power partial display mode, two groups of adjacent lines are joined so they are each controlled by a respective line control signal from the control circuit. The N lines and groups of lines are simultaneously addressed in active manner at two voltage levels. N line control signals include a series of N-bit binary line words that change every determined period of time, T, so 2N combinations of binary line words are present in each successive cycle of length 2N·T.

Abstract: The display device includes a display cell including liquid crystals and a matrix of electrodes arranged in lines and columns in a closed cavity. The lines and columns define display cell pixels. The display device includes a control circuit for lines and columns for display of data on the display cell. In complete display mode, all lines and columns are addressed at several voltage levels by successive line-by-line multiplexing. In low power partial display mode, two groups of adjacent lines are joined so they are each controlled by a respective line control signal from the control circuit. The N lines and groups of lines are simultaneously addressed in active manner at two voltage levels. N line control signals include a series of N-bit binary line words that change every determined period of time, T, so 2N combinations of binary line words are present in each successive cycle of length 2N·T.

Abstract: The portable electronic device, preferably a wristwatch, includes a radiofrequency signal receiver for receiving, in particular, GPS signals via an antenna, a magnetic compass, a microprocessor data processing unit for processing data provided by the receiver and the compass, and storage means in which almanac and ephemeredes data relating to satellites is stored. The compass is arranged for provide an orientation signal to the data processing device. In this manner, the unit can control means for indicating a direction to indicate a preferred orientation for searching for satellites visible to the user in a reading position of the watch. These indicating means can be formed by the time indicating hands moved above a watch dial. The preferred orientation is calculated by the processing unit on the basis of the almanac and ephemeredes data, time data and the orientation signal.

Abstract: The portable electronic device, preferably a wristwatch, includes a radiofrequency signal receiver for receiving, in particular, GPS signals via an antenna, a magnetic compass, a microprocessor data processing unit for processing data provided by the receiver and the compass, and storage means in which almanac and ephemeredes data relating to satellites is stored. The compass is arranged for provide an orientation signal to the data processing device. In this manner, the unit can control means for indicating a direction to indicate a preferred orientation for searching for satellites visible to the user in a reading position of the watch. These indicating means can be formed by the time indicating hands moved above a watch dial. The preferred orientation is calculated by the processing unit on the basis of the almanac and ephemeredes data, time data and the orientation signal.

Abstract: The receiver includes: a correlation stage (7) formed of several correlation channels (7?) for receiving intermediate signals (IF) in order to correlate them, in operating channel control loops, with the carrier frequency and specific code replicas of visible emitting satellites to be searched and tracked, each channel having a correlator (8) in which at least one integrator counter (28, 29, 30, 31) provides, at the end of each determined integration period of the correlated signals, a binary output word whose value allows detection of the presence or absence of the visible satellite to be searched and tracked; and a microprocessor for processing the data drawn, after correlation, from the radio-frequency signals.

Abstract: The receiver (1) for radio-frequency signals (SV1, SV2, SV3, SV4), modulated by specific codes of transmitting sources, such as satellites (S1, S2, S3, 54), includes receiving and shaping means with frequency conversion for the radio-frequency signals for generating intermediate signals, a correlation stage formed of several correlation channels for receiving the intermediate signals and microprocessor means connected to the correlation stage in order to process the extracted data after correlation. Each channel includes a correlator in which the intermediate signals are correlated with at least two early and late replicas of the specific code of a visible transmitting source to be searched and tracked. The correlator further includes integrator counters for the correlated signals to provide a first amplitude value of the auto-correlation function of the early signals and a second amplitude value for the late signals.

Abstract: The method of determining the position of a radio-frequency signal receiver consists first of all in dividing the Earth's surface into N geographical regions as a function of the N channels available in the correlation stage of the receiver. At least one satellite in projection onto the Earth's surface has to be located in each of the N defined regions. The N channels of the correlation stage are each configured and switched on to search for a visible satellite in one of the N respective regions. Radio-frequency signal reception and shaping means pick up said radio-frequency signals and frequency convert them to provide intermediate signals to the correlation stage. Once one of the channels has detected a visible satellite in one of the N regions, the operation of all the other channels is interrupted by a stop block located in each of the other channels.

Abstract: The method of determining the position of a radio-frequency signal receiver consists first of all in dividing the Earth's surface into N geographical regions as a function of the N channels available in the correlation stage of the receiver. At least one satellite in projection onto the Earth's surface has to be located in each of the N defined regions. The N channels of the correlation stage are each configured and switched on to search for a visible satellite in one of the N respective regions. Radio-frequency signal reception and shaping means pick up said radio-frequency signals and frequency convert them to provide intermediate signals to the correlation stage. Once one of the channels has detected a visible satellite in one of the N regions, the operation of all the other channels is interrupted by a stop block located in each of the other channels.

Abstract: The receiver (1) for radio-frequency signals (SV1, SV2, SV3, SV4), modulated by specific codes of transmitting sources, such as satellites (S1, S2, S3, S4), includes receiving and shaping means with frequency conversion for the radio-frequency signals for generating intermediate signals, a correlation stage formed of several correlation channels for receiving the intermediate signals and microprocessor means connected to the correlation stage in order to process the extracted data after correlation. Each channel includes a correlator in which the intermediate signals are correlated with at least two early and late replicas of the specific code of a visible transmitting source to be searched and tracked. The correlator further includes integration means for the correlated signals to provide a first amplitude value of the auto-correlation function of the early signals and a second amplitude value for the late signals.

Abstract: The receiver for radio-frequency signals, particularly of the GPS type, includes receiving and shaping means with frequency conversion for the radio-frequency signals (3) for generating intermediate signals (IF), a correlation stage (7) formed of several correlation channels (7′) for receiving the intermediate signals in order to correlate them, in operating channel control loops, with the frequency carrier and specific code replicas of visible emitting satellites to be searched and tracked, each channel being provided with a correlator (8) in which at least one integrator counter (28, 29, 30, 31) is capable of providing, at the end of each determined integration period of the correlated signals, a binary output word whose value, compared to a determined detection threshold level, allows detection of the presence or absence of the visible satellite to be searched and tracked, microprocessor means (12) connected to the correlation stage for processing the data drawn, after correlation, from the radio-fre